88 



the eye; diameter of the eye contained about five times in the 

 length of the head; spine of the forward gill-cover stout, 

 prominent, acute, directed obliquely upwards, sometimes a 

 smaller spine occurs at the base below this, having its point 

 directed straight downwards; the one on the lower angle of 

 the gill-cover is very conspicuous, acute, and directed as 

 usual downwards and forwards; first dorsal fin uniformly 

 arched, as is also the second dorsal; the origin of the anal fin 

 is under the position of the fourth ray of the second dorsal: 

 the caudal forms two-elevenths of the entire lenth; the ven- 

 tral is inserted in advance of the position of the first dorsal 

 fin. Color yellowish, clouded with blackish, the first dorsal 

 fin margined narrowly with orange. Length, 3 — 3f inche!<. 



Fin-rays:— D. 8, IT; P. 12; Y. 1, 3; A. 12; C. 18. 



C. viscosus, Haldem, Suppl. Monogr, Limn, cl' C, 1840, 

 p. 3; Girard, Proc. Araer. Assoc. Adv. Sc. II, 1850, p. 441: 

 Proc. Bost, Soc. Nat. Plist. Ill, 1850, p. 189; and Smith's 

 Contrib. Ill, 1852, p. 51; pi. 2; fig. 1, 2; pi. 3; fig. 1—9. 



Not the Miller's Thumb of Annapolis, West liiver and the 

 Patuxent, which belong^to the group of Toad Fishes. It 

 occurs in Rock Creek, near Georgetown, D of C and in 

 some of the small streams near Baltimore. 



XXI— HEMITRIPTERIDiE. 



IIEMITRIPTERUS, Cm. c^- A^il. 



H. aeadianiis. 



American Sea Raven. 



Body oblong, cylindrical, tapering rapidly to the tail: 

 head large, with irregular cavities, knobs and elevations: 

 above the snout is an elevated crest on each side, with spinous 

 projections; from several of these prominences arise linger- 

 like slips, also ten or twelve similar ones are pendant from 

 the lower jaw; surface of body covered with a granulated 

 skin, upon which are rows of small conical tubercles. Sur- 

 face of head, body and fins l)right lemon-yellow or blood-red. 

 Length, 1 to 2 feet. 



Fin-rays:— D. 10, 14; P. 18; V. 1, 3: A. 14; C. 12. 



Cottus acadianus, Peun. Arct. Zool. Ill, ]). 371. 



— tripteryg'ius, Bl. Schn., p. 63. 



— liisindus, Bl. Schn., p. (33; pi. 13. 



ScorpcBna flava, Mitch.. Trans. Lit. &: Phil. Soc. New York 

 I, p. 382; pi. 2; fig. 8. 



— imrpurea et ru/e, Mitch. Amer. Month, Mag. II, p. 245. 



