42 THE NAUTILUS
April 21, 1982
Vol. 96(2)
ferently, more sparsely ribbed dorsal girdle
scales, and the differently shaped central
radular tooth.
It is to be hoped that more specimens will turn
up in due course, although I have the impression
that it is rather rare in this well-investigated
area.
LITERATURE CITED
Kaas, P. 1972. Polyplacophora of the Caribbean Region.
Stud. Fauna CMrafao41(137):l-165, figs. 1-247,' pis. 1-9.
(The Hague, M. Nijhoff)
1978. Notes on Loricata, 10. On the European
Callochiton species. Basteria 42:73-75.
A NEW TROPICAL EASTERN PACIFIC OVULIDAE (GASTROPODA):
XANDAROVULA HAMMESI
Hans Bertsch and Loyal J. Bibbey
Ciencias Marinas
Universidad Autonoma de Baja California
Ensenada, B.C., Mexico
In a recent review of the Ovulidae, Cate (1973)
listed 7 species from the Panamic province
(tropical west America). Since then, although
more than 25 additional new taxa of ovulids
have been proposed from I ndo-Pacific and
Caribbean waters (e.g., Azuma, 1972; Cate,
1974b, 1975, 1976a, and 1978; and Petuch,
1979), only one new species has been named
from the Panamic region (Cate, 1976b). Emer-
son and Old (1965) had previously reported the
Galapagan occurrence of Pseudocypraea adam-
sonii, an Indo-Pacific ovulid. To these tropical
eastern Pacific ovulid species we add the follow-
ing: 2 species from Panama, one known only
from the type locality and the other a widely
ranging taxon in the western Pacific:
Xandarovula hammesi
Bertsch & Bibbey, sp. nov.
(Figs. 1-6)
Description: Thin, white glossy shell, quite
large for the genus; ovalish, with both ends
pointed; bulbous in the middle; adapical terminal
protrudes sharply, completely on right-half of
shell, distinctly set off from the left side of the
bulbous body whorl; abapical terminal much
more gently narrowing along the left side;
smooth except for extremely fine longitudinal
growth striae, and faint, fine transverse line
more prominent terminally and on the columel-
la; outer lip evenly rounded, circular rather than
oval; no lip callus; apertural opening comprises
nearly 1/2 the total area of the ventral side;
aperture terminals open slightly to the side
adapically, but straight abapically (anteriorly);
anterior columellar region thin and narrow,
forming a fragile edge to the anterior gutter-
shaped siphonal canal; posterior axis delicately
tortuous, twisting a full 180° from its proximal
juncture with the body whorl to its distal ter-
mination.
Type locality: All three specimens examined
were collected in shrimp nets from about 1000
feet, off Cebaco Island (approx. 7°30'N;
81°30'W), Pacific coast of Panama, approxi-
mately in September of 1979. Holotj'pe: San
Diego Natural History Museum, Marine Inver-
BioStor
