no.1125. CESTODE PARASITES OF FISHES— LINTON. 425 2. TAENIA DILATATA Linton. Tania dilatata Linton, [J. s. Fish Com. Rept., 1886, pp. 488-489, pi. v, figs. 1 1 16. No. 4812, U.8.N.M. From common eel (Anguilla chrysopa). Several strobiles but in bad state of preservation ; no scolices; anterior ends have been exceedingly long and slender. The characteristic dilata-tions of this species can not be proved from these specimens. The general appearance of the strobiles, as well as the character of the seg-ments, however, agrees with this species. It may be added that the segments of these specimens agree with Molin's description of his /'. hemispherica. With the evidence at hand, however, I do not feel justified in uniting the two species of T. dilatata md T. hemispherica. 3. TAENIA OCELLATA Rudolphi (>). (Plate XXVII, figs. 6-11.) Tamia ocellata Diesing, Syst. Helm., I, p. 513; Revis. cl. Cephal., Cycl., pp. 376-377.— Von Linstow, Trosch. Archiv., 1875, I, p. 184.— Zschokkk, Rech. Vers Parasit. des Poissons d'eau donee, pp. 13-14. No. 474l\ CS.N.M. Two tapeworms from rock-bass {Ambloplites upestris); J. W. Milner. Doctor Joseph Leidy describes a tapeworm rom this fish 1 under the name of Tcenia ambloplitis, which he states esembles T. ocellata Rudolphi of the European perch (Perca fluviatilis) nd perhaps is the same. My specimens agree with Doctor Leidy's pretty well except in the haracter of the neck. In T. ambloplitis the neck is described as -short r none." In my specimens the neck is long. There is need of special systematic work to be done on species of the emis Tamia infesting the fresh water fishesof North America. Of the pecimens that have fallen under my observation, thus far only alco-olic, there are present so many characters that seem to unite them ith some established European species, at the same time with so many mitradictory characters, that satisfactory identifications can not be iade. The two specimens in this lot are 310 and 470 mm. in length, respec-vcly. Other dimensions of the larger specimens are: Diameter of head 75 mm.; breadth of neck. 0.55; thickness of neck, 0.5; diameter of iUcker, 0.4. uHead squarish, depressed, bothria orbicular, prominent, with strong uiscular structure. The head is slightly prominent at apex and is ter-hnated by a small pore, which may and probably does function as a icker. Neck narrower than head, subcylindrical, increasing in breadth piformly for the first 15 mm., where, in the larger specimen its jeadth is 1.35 mm.; it is unjointed, but is moderately wrinkled trans-arsely, transparent, with somewhat delicate tissue. The first segments e about 30 mm. back of the head; 1.5 broad aud 0.25 long-; indistinct. 'Proc. Acad. Nat. Sci., Phila., 1X87, pp. 22-23, figs. 7-8.
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