676 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



The oesophagus has the three longitudinal folds slightly prominent, 

 rounded at their exterior ends. Six ocelli w ere all that could be distin- 

 guished ; of these, those of one pair, situated on the front of the first 

 segment, are much the largest; two pairs, much smaller and inconspicu- 

 ous, are placed well apart on the sides of the buccal segment. 

 Anal orifice large, with a ra ised border, situated a little in advance of 

 the i^osterior end of the back. 



Color above, brownish black, dark brown, fuscous, or dark cinereous, 

 with four longitudinal rows of irregular, nearly confluent, black spots, 

 intermingled with light brown or grayish spots, which often also form 

 the centers of the black spots. Lower surface plain brown or fuscous, 

 usually a little lighter than the back. 



Var. h. — Back with a light reddish or brownish median stripe, and a 

 broad band of blackish on each side, often more or less interrupted with 

 lighter mottlings, 



Var. a. — iSTew Haven and Farmington, Conn. — A. E. Verrill ; Fal- 

 mouth, Mass. — Dr. Edw. Palmer ; Lake Raymond, N'ebraska — T. M. 

 Prudden, 1873. This variety is very common in the fresh waters of 

 New England. 



Var. b. — Yellowstone Lake — Dr. Josiah Curtis; San Luis Valley, 

 Colorado — Lieutenant Marshall, Wheeler's expedition, (also var. a;) 

 Colorado — Hayden's expedition 1873, (var. b, and plain dark brown 

 variety.) 



Nephklis marmorata Verrill. 



American Journal of Science, vol. iii, p. 134, 1872. 



Hirado marmorata Say, op. cit., p. 267. 



(?) Nephelis punctata Leidy, Proc. Acad. Nat. Sci. of Pliilad., 1870, p. 89. 



This species, found by Say associated with N'. lateralis, appears to 

 difl'er in no important particulars, and may be only a differently colored 

 variety of the same species. It is described as blackish or fuscous, 

 with irregular w^hitish or light colored spots ; beneath pale, generally 

 immaculate, but sometimes with confluent black spots. Ocular points 

 six, in a regularly curved line. 



When a larger series of living specimens from various localities can 

 be studied, the three preceding forms, admitted here as distinct, may 

 prove to be mere varieties of one species, no less variable than the We- 

 phelis vulgaris of Europe. The agreement in the number and arrange- 

 ment of the ocelli is very close in the three forms. 



The leech described by Dr. Leidy from the vicinity of Philadelphia 

 and from Beverly, N. J,, appears to differ in no essential characters. It 

 w^as blackish olivaceous above ; the annuli minutely punctate with yel- 

 lowish olivaceous or dusky white, and narrowly bordered with the same ; 

 beneath grayish. 



Nephelis fervida Verrill. 



American Journal of Science, vol. ii, p. 451, 1871, and vol. iii, p. 134, 1872. 



Body 2 or 3 inches long, 0.20 to 0.30 of an inch w ide, elongated and slen- 



