Storer’s Synopsis of the Fishes of North America. 507 
Ds (ay Ba (2) Ven(2) 22 Cues Length, 1 to 3 feet. 
Northerly, beyond the coast of Labrador, Dexay. Massachusetts, Storer. Connecti- 
eut, Ayres. New York, Dexay. 
Spinax acanthias, Picked Dog-fish, Storrr’s Report, p. 187. 
K sf (?), Spinous Dog-fish, Dexay’s Report, p. 359, pl. 64, fig. 187. 
BS ne Dog-fish, Ayres, Bost. Journ. Nat. Hist., rv. p. 289. 
GENUS VII. SCYMNUS, Cuv. 
All the fins small ; two dorsal fins, the first but little before, and the second 
but little behind, the line of the ventrals ; no anal fin. Skin rough. ‘T’em- 
poral orifices or spiracles large, placed rather high up on the head, above as 
well as behind the eyes. Teeth in the lower jaw crooked at the point, equi- 
lateral at the base ; in the upper jaw, lancet-shaped, but little curved ; the 
points in both jaws diverging from the centre. Gill-openings small. 
1. Scymnus brevipinna, Lesurur. 
Body elongated, very narrow at base of tail. Lateral line black, undulating at the 
head, and marked in its whole length with small transverse lines. Tail wide, emarginate. 
D. (?). P.(?). V.(2). C.(?). Length, 6 feet 5 inches. 
Massachusetts, Lesurur. 
Somniosus brevipinna, Nurse or Sleeper, Lesveur, Journ, Acad. Nat. Sc., 1. p. 222, pl. 
u. us fe Srorer’s Report, p. 189. 
Scymnus brevipinna, Nurse, DEKAy’s Report, p. 361, pl. 61, fig. 202. 
Lesueur does not refer to the ¢eeth, in his account of this species, and hence it is impossible 
to fix with certainty its generic locality. His general description, however, leads us to sup- 
pose that it is probably a Scymnus, and we therefore follow the opinion of Dekay, and place 
it in that genus, in preference to leaving it in Lesueur’s “ illy-constructed genus Somnio- 
sus,’’ as is well remarked by Dekay. 
GENUS VIII. ZYGAINA, Cvv. 
Head depressed, more or less truncated in front ; the sides extend horizon- 
tally to a considerable length, with the eyes at the external lateral extremity. 
Teeth of the same shape in the upper and lower jaw, namely, the points di- 
rected towards the corner of the mouth, with a smooth edge when young, but 
distinctly serrated in adult specimens. Branchial openings, five. Two dor- 
sal fins ; the first in a line close behind the pectorals ; the second over the 
anal fin. 
