DESCRIPTION OF A KEW SPECIES OF SUBTEKRANEAI^ 
ISOPOD. 
By W. P. Hay, M. S., 
Central High School, Washinijlon, 1>. C 
Forty or fifty specimens of an interesting and apparently nndescribed 
Isopod were obtained from an old well in Irvington, Marion County, 
Indiana. They were evidently strictly aquatic. The pump in the well 
drew water from the bottom, and the animals could be obtained only by 
vigorous work. After capture they lived for some hours in a jar of 
water, crawling about on the bottom, very much after the manner of 
Asellus. While in the water the pleopods could be seen to be gently 
moved up and down with a fanlike motion. Several of the females 
carried eggs, six or eight of which were sufficient to till the brood 
pouch. 
The nearest relatives of this species are Kaplophthalmus mengii 
(Zaddach) and H. danicus Budde-Lund, both of which are inhabitants 
of moist situations, such as decaying leaves and wood, in various locali- 
ties in Europe. It is also closely related to Scyphacella [Haplophthal- 
musf) arenicola S. I. Smith, which has been found burrowing in the 
sand in a number of localities along the Atlantic coast of North 
America. 
HAPLOPHTHALMUS PUTEUS, new species. 
Male. — Body elliptical, length about three times the breadth, dorsal 
surface strongly convex, covered with longitudinal rows of low tuber 
cles and scattered sette. Segments of the perteon about equal in length, 
the posterior pleural angle of all, except the first, more or less pro- 
duced backwards. PleuriB of third, fourth, and fifth segments of the 
pleon thin and directed backwards and outwards. Terminal segment 
of abdomen notched behind and with the postero lateral margins con- 
cave. Uropods exserted, short, outer ramus longer than inner; both 
rami setose. Front margin of head very slightly produced. Antennae 
longer than the greatest breadth of the body; first and second seg- 
ments of medium length, third short, fourth and fifth long, flagelliim 
sliort, pinniform, composed of three very small, closely articulated seg- 
ments. Antenn;e geniculate between segments four and five. Anten- 
nules minute, composed of three segments, entirely concealed by the 
front of the head, sensory filaments five. Eyes small, simple. Upper 
lip regularly rounded in front and with a median triangular patch of 
Proceedings U. S. National Museum, Vol. XXI— No. 1 176. 
871 
872 PROCEEDINGS OF THE NATIONAL MUSEVM. vol.xxi. 
seta'. Mandibles large and powerful, bearing on the inner surface a 
broad, ridged molar tubercle; on the anterior surface, one or two deli- 
cate, branched sensory styles. The cutting portion of the mandibles 
is different; that on the left, consists of two portions, an outer with 
four heavy teeth and an inner with three much smaller teeth; the 
other mandible has but one row of three or four large teeth which, when 
closed, fit in the space between the two rows of teeth of the mandible 
first described. The first maxilla has both branches erect, the outer 
bearing five or six acute curved teeth, the inner three delicate plumose 
flagelliform processes. The second maxilla consists of two strap-shaped 
lamella} closely applied to one another and bearing seta3 at their ends. 
The maxilliped is a broad, flattened plate, with straight inner and 
rounded outer margins, and bearing at the tip two obscurely segmented, 
setose processes. The per?eopods are similar in general to one another, 
differing only in the arrangement and strength of the spines. 
The first and second pairs of pleopods are two-segmented, slender, 
and styliform. The second pair appear to be the sexual organs, while 
the first are to some degree rudimentary. 
The third pleopod is flattened and somewhat operculiform. 
The fourth and fifth pleopods are broad, flat, thin, and lie flat upon 
one another and the last segment of the pleon. They and the preced iug 
are the branchial appendages of the animal. 
The uropods have been already described. 
Color, white; eyes, black; intestine showing through the shell as a 
grayish line. 
Female. — Similar in general characters to the male, but with the fol- 
lowing differences: Body not more than two and one-half times as long 
as wide. First and second pleopods absent. Per;copods with flattened 
plates, forming a brood or egg chamber. 
Length, 3 to 4 mm, 
Type.—Eo. 22586, U.S.N.M. 
• EXPLANATION OF PLATE LXXXVl. 
Fig. 1. Dorsal view of a male specimen. 
2. Maudible of right side, seen from in front. 
3. Mandible of left side (tip only), to show double row of cutting teeth and 
ridges on molar tubercle. 
4. First maxilla. 
5. First maxilliped. 
6. Upper lip. 
7. Antenna (second antenna). 
8. Antennule (first antenna). 
9. First periL'opod. 
10. First pleoj)od. 
11. Second pleoijod. 
12. Third pleopod. 
13. Fourth pleopod. 
14. Fifth pleopod. 
15. Uropod (right side). 
U. S. NATIONAL MUSEUM 

PROCEEDINGS, VOL. XXI PL. LXXXVI 

Haplophthalmus puteus W. p. Hay, new species. 

For explanation of plate see page 872.