414 PROCEEDINGS OF THE ACADEMY OF [1890. 



cal Garden in 1875. ^Submitted by Dr. H. C. Chapman. Numer- 

 ous 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. 



19. Distomum trapezium n. s. 



Body ovate lanceolate, flat, smooth, narrowest in front ; mouth 

 subterminal, 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. A single 

 specimen from the American osprey, Pandion carollnensis. Sub- 

 mitted by Dr. H. C. Chapman. 



20. Distomum aniarum n. s. 



Body elliptical, flat, translucent white with a median brown streak, 

 smooth. Oral acetabulum subterminal, circular; mouth transverse 

 oval, unarmed. Ventral acetabulum larger, sessile, situated just in 

 advance of the middle of the body. Genital aperture close to the 

 oral acetabulum ; uterus median, tortuous filled with brown ova ; 

 testes two, situated one on each side immediately behind the ven- 

 tral acetabulum. Length from 1'875 to 3 mm ; breadth 0"875 to 1 

 mm. Diameter of oral acetabulum 0*375 mm. ; of ventral acetabu- 

 lum 0*5 mm. Ova oval yellowish-browni, 0'032 by 0*02 mm. Six 

 specimens obtained from the mouth of the Water-snake, Tropidono- 

 tus sipedon. Submitted by Dr. H. C. Chapman. 



21. Distomum incommodum. 



? Monostomwn incommodmn Leidy, Pr. A. N. S. 1856, 43. 

 Di stoma oricola Leidy, Ibid. 1884, 47. . 



22. Distomum gastrocolum n. s. 



Body elongated elliptical, flattened, smooth, translucent reddish, 

 with brown intestine and yellowish genitals ; cephalic extremity 

 narrower, posterior extremity obtusely rounded, or somewhat 

 abruptly prolonged and truncate and with a large contractile vesicle 

 opening externally ; ventral acetabulum 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 



