April 3, 1903.] 



SCIENCE. 



533 



but specifically distinct, occur in the urin- 

 ary bladder of a salamander, Amblystoma 

 tigrinum Green, whicli is found frequently 

 in the district near Saint Paul, Minn. 

 The number of the parasites found in a 

 single host is not large (two to ten and 

 this in only six out of twenty-nine salaman- 

 ders examined). The total length of the 

 largest specimen of the parasite thus far 

 seen is 3.5 mm., its greatest width 1.4 mm. 

 or 40 per cent, of the length. It is thus 

 much narrower than any of the old world 

 forms, P. patellar e having this ratio, 66 

 per cent., P. spatula (Odhner, '00) 63 per 

 cent, and P. folmm 48 per cent. One of 

 Odhner 's species, P. unicum, has a width 

 of 43 per cent, of the length, according to 

 his figures. The testes in the American 

 form are both completely posterior to the 

 ovary, and nearly in line one in front of 

 the other. The testes, ovary and vitellaria 

 are aU deeply lobed. This is unlike P. 

 unicum, which resembles this species in its 

 proportions, but in which the genital or- 

 gans are said to be entire or nearly so. The 

 course of the uterus is characteristic: next 

 the ootype there is, first on the left side 

 a loop forward, then one backward and 

 behind the posterior testis, then one in 

 front of this and behind the anterior testis, 

 then another in front of the anterior testis, 

 then crossing to the right side in front of 

 the ovary, first an anterior loop and then 

 a posterior loop. This is unlike either P. 

 folium or P. patellare. A fuller account of 

 the anatomy of this species is in process of 

 preparation; the name is given in view of 

 its being the first species of the genus to be 

 reported from this country. 



On Cryptogonimus chyli, n. g., n. sp., a 

 Trematode from Lake Chautauqua, N. 

 Y., with Novel Type of Ventral Sucker: 

 Henry Leslie Osbobn, Hamline Univer- 

 sity. 

 A very small distomid fluke (0.5-1.3 



mm. in length) of decidedly aberrant struc- 

 ture occurs abundantly in the chyle of the 

 black bass (Micropterus dolomieu) of Lake 

 Chautauqua, New York, and in the St. 

 Mary's Eiver near Sault Sainte Marie, 

 Mich. The body is cylindrical, obtusely 

 tapering posteriorly, is covered with broad 

 flat scales and has a large oral sucker. 

 About the front end of the middle third of 

 the body there is, mid-ventrally, a peculiar 

 and unique sheath, with circular lip and 

 sphincter muscle enclosing a chamber in 

 which are located two entirely disconnected 

 ventral suckers, one behind the other, with 

 the genital pore located in the middle line 

 between them and wholly separate from 

 either. There is a pharynx, a very short 

 oesophagus, the intestines reach only to the 

 beginning of the hinder third of the body, 

 there are two conspicuous masses of pig- 

 ment (but no lenses) on either side of the 

 pharynx, seemingly rudiments of eyes. The 

 excretory pore is terminal, there is a large 

 median bladder in the hinder third of the 

 body, and a large fork from it on each side 

 running forward to the level of the pharynx, 

 forming there a large conspicuous hollow 

 cavity on each side. The spermaries are 

 oblique and near the beginning of the 

 hinder third of the body. The ovary is 

 near the level of the anterior spermary, 

 the uterus passes posteriorly to the extreme 

 end of the body, returns on the opposite 

 side black in color from the multitudes of 

 ova, crosses to the right side and runs to 

 the surface, crossing over the posterior ven- 

 tral sucker in its course, and joining the 

 ductus ejaculatorius to form a very short 

 muscular genital sinus. The vitellaria con- 

 sists of a number of distinct follicles in a 

 row laterally in the middle third of the 

 body. A Laurer's canal or seminal re- 

 ceptacle seems to be present in the form of 

 a tube connected with the oviduct near the 

 junction of the yolk duets, but it lacks a 



