RESK ARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 237 



and were all provided with a conspicuous style, in the forehead as 

 it were, ready for penetration into their as yet unknown future host. 



25. Distomum centrappendiculatuni . — Distoma appendiadata l^ei&y . 

 Proc. A. N. S., 1877, 202 ; not Distomum appcndiculatum Rudolphi. 



26. Tctracotylc tipica, Diesing. — Body flattened obpyriform, with 

 an oral, a ventral central and anterior lateral pair of bothria. Length 

 1. 125 to 1.25 mm. long by 0.95 to 1.125 mm. broad. 



Encysted in the liver and genital gland of Lymncea catascopiuni 

 and Physa hclerostropha. Sixty-five specimens were obtained from 

 a single Physa. 



27. Cercaria p/alyiira, n. s. — Body elongated hemielliptical, widest 

 and truncate behind ; head rounded ; oral acetabulum large and 

 spherical, with a strong style in the upper lip : ventral acetabulum 

 central, smaller than the former. Tail nearly as long as the body, 

 stout, tapering, corrugated, and with a broad, costate, lateral mem- 

 brane. Length 0.8 mm.; body 0.4 by 0.12 mm.; tail 0.36 by 0.06 

 mm. at ba.se, breadth with membranous alee 0.14 mm.; oral acetabu- 

 lum 0.08 mm.; \-entral acetabulum 0.06 mm. 



Found free in a pool, with Lymncus, at Fort Bridger, Wyoming. 



28. Cysturrciis temdcollis, Rudolphi. The larva of Tcsyiia viargi- 

 nata Batsch. 



1. A specimen enclosed in a spherical cyst an inch in diameter 

 attached to the paunch of a young sheep, Ovis arics. Cysticercus 

 3 inches long with terminal cyst an inch in diameter ; the retracted 

 head and neck an additional inch in length. Submitted by Dr. J. 

 Cheston Morris. 



2. A specimen from the vagina of a vSheep measured 5)2 inches 

 in length, with the terminal cyst over an inch in diameter. 



3. A .specimen enclosed in a .sac an inch in diameter attached by 

 a pedicle two inches in length to the liver of a Monkey, Scmnopith- 

 tcits cnlellus.. The worm was 22 mm. long; the body 8 mm.; the 

 terminal cyst 14 mm. in diameter ; the retracted head i nun. broad : 

 the bothria 0.375 mm. ; the ro.strum with its double circle of hooks 

 0.37.S mm. Submitted by Dr. H. C. Chapman. 



29. Cysticercus pisiformis, Zeder. = Larvaof TiFuiastrmta, Goeze. — 

 Numerous sacs simple and compound, ranging from 2 to 3 centi- 

 meters in diameter, with worms isolated and in groups in various 

 stages of development. One large sac contained a dozen groups 

 adherent to the inner surface ; the groups with from 6 to 30 worms, 

 opaque yellowish, obconic from 4 to 6 mm. long by 1.5 mm. thick, 

 with head and neck retracted nearly the length of the rest of the 

 bodv, which is transversely corrugated. Bothria 0.225 mi"-; ^os- 



