212 rp:searches in helmintholoctV and parasitology. 



Body long, flattened, band-like, with the neck tapering and the 

 tail obtusely rounded. Head reniform, with a coronet of strong, 

 straight spines — from 30 to 36. Ventral acetabulum much larger 

 than the head, situated at the base of the neck a short distance be- 

 hind the latter, spherical. Body of nearly uniform width. Oral 

 acetabulum small ; phar3'nx oval ; intestines simple and narrow. 

 Genital orifice immediately in advance of the ventral acetabulum ; 

 cirrus exsert to one side, curved and smooth ; testes situated almost 

 midway between the ventral acetabulum and tail ; oviducts median 

 behind the ventral acetabulum ; ova oval, yellow ; vitelline glands 

 large and con.spicuous, racemose, extending along the intestines 

 from the ventral acetabulum to the end of the tail. 



Head 0.5 to 0.6 mm. broad ; spines about o. i long by 0.02 thick ; 

 oral acetabulum 0.25 ; pharynx 0.3 long, 0.225 wide; ventral ace- 

 tabulum 0.875 to 1.25. Ova 0.1 long by 0.072 broad. 



Since the above communication a collection of worms from the 

 small intestine of a Muskrat has been received. Eighteen of the 

 worms pertain to the supposed Distomii^n echinahini and range from 

 18 to 25 mm. long. In all, the fore part of the body to a short dis- 

 tance behind the ventral acetabulum is finely echinate, while the 

 rest is .smooth. Two other worms appear to belong to Aniphisto- 

 nnivi sHbtriqjutnnn, 12 and 15 mm. long, a parasite previously 

 observed only in the Beaver of Europe. 



[March, 1888. No. 559. See Bibliography.] 



Entozoa of t lie Terrapin. — Prof. Leidy stated that he had on one 

 occasion examined eight of our much esteemed food Terrapins to 

 ascertain the character of their parasites. All were found to be in- 

 fested with an Echinorhynchns, living in the small intestine and 

 clinging by the thorny head to any part of the canal. The worms 

 range from six to sixteen lines in length and in numbers from five 

 to upwards of two hundred. The species is Echhiorhynchiis hamn- 

 latus, originally described from several of our fresh-water turtles. 

 (See these Proceedings, 1856, 48.) 



In three of the Terrapins occurred a red thread worm, also living 

 in the small intestine and associated with the former and, like them, 

 clinging by their armed mouth to the mucous membrane. The 

 species is the Ciiadanns microccphalus, the males up to nine lines, 

 the females from twelve to sixteen lines. In one Terrapin there 

 were eight, in a second over a hundred, and in the third upwards of 

 several hundred. They extended all along the intestine, but were 



