RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 2^5 



1 8. .IviphistoDiiDu fabaccum, Diesing. — Body heniiovoid, convex 

 dorsally, flat ventrically. Numerous specimens, from 7 to 9 mm. 

 long by 3.4 to 5 mm. broad, from the large intestine of a Sea-cow, 

 Manatiis latirostris, which died in the Zoological Garden in 1875. 

 Submitted by Dr. H. C. Chapman. Numerous specimens, many of 

 larger size, up to 11 mm. long by 9 mm. broad, were obtained from 

 the nasal passages of another Sea-cow, and were presented to the 

 Academy by Jacob Geismar. 



1 9. Disto^num trapezium , n. s. — Body ovate lanceolate, flat, smooth , 

 narrowest in front ; mouth subterrainal, transverse oval, unarmed ; 

 ventral acetabulum situated a short distance behind the former, 

 about twice the .size. Color brown, darker laterally and thicker, 

 due to the vitelline glands, which extend from the ventral disk to 

 the posterior extremity of the body. Testes just behind the ventral 

 disk ; uterus dendritic and occupying the interspaces of the vitelline 

 glands. Genital aperture back of the oral disk. Length 21 mm., 

 breadth 6 mm. h. single specimen from the American osprey, 

 Pandioii carolinensis. Submitted by Dr. H. C. Chapman. 



20. Distoimim aniariim, n. s. — Body elliptical, flat, translucent 

 white with a median brown streak, smooth. Oral acetabulum sub- 

 terminal, circular ; mouth transverse oval, unarmed. Ventral ace- 

 tabulum larger, sessile, situated just in advance of the middle of the 

 bod5^ Genital aperture close to the oral acetabulum ; uterus me- 

 dian, tortuous, filled with brown ova ; testes two, situated one on 

 each side immediately behind the ventral acetabulum. Length from 

 1.875 to 3 mm.; breadth 0.875 mm. to i mm.; diameter of oral ace- 

 tabulum 0.375 mm.; of ventral acetabulum 0.5 mm. Ova oval yel- 

 lowish-brown, 0.032 by 0.02 mm. Six specimens obtained from the 

 mouth of the Water-snake, Tropidonotns sipedon. Submitted by Dr. 

 H. C. Chapman. 



21. Distomuni i)icommodmn. 



f Monostomi(})i incommoduin, Leid}'. Pr. A. N. S., 1858, 43. 

 Distoma oricola, Leidy, Ibid., 1884, 47. 



22. Distomuni gastrocolum, n. s. — Body elongated, elliptical, flat- 

 tened, smooth, translucent reddi.sh, with brown intestine and yellow- 

 ish genitals ; cephalic extremity narrower, posterior extremity ob- 

 tusely rounded, or somewhat abruptly prolonged and truncate and 

 with a large contractile vesicle opening externally ; ventral acetabu- 

 lum spherical, nearly as broad as the body ; oral acetabulum about 

 half the size of the former. Pharynx immediately succeeding ; forks 

 of the intestine capacious, distant from the end of the body. Uterus 

 coiled along the middle of the body and filled with yellowish ova ; 



