870 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
torals short aud broad. First dorsal inserted near middle of length of 
body 5 caudal not large. (Garman.) Deep water, off the coast of Vir- 
ginia; one specimen known. 
(Scylliiim retiferum Garman, Bull. Mus. Comiu Zocil. xi, 233, 1881.) 
Page 18. Instead of Galeorhinidcc, read: 
Family VII. — CARCIIARIID^. 
On page 19, instead of Mustelns liinnulus, read: 
19. canis (Mitch.) Dek. 
Add to the synonymy: 
(^‘Squahis cams Mitch. Trans. Lit. & Phil. Soc. N. Y. i, 486, 1815: Mustelus asterias 
Cloquet, Diet. Sci. Nat. xiv, 407, 1820: Muslelus plehejus Bouap. Fauna Italica, 1838, 
49.”) 
Page 20, species 20 : 
The Mustelus canis of our Atlantic coast seems to us to be perfectly 
identical with the European species, the American name having prior- 
ity of date. Mustelus californicus Gill, is however a different species. 
It may be thus compared with M. canis, the differential characters of the 
latter species being interposed in iiarenthesis : In jNo. 20, ill. califonii- 
eus Gill, the dorsal fin is comparatively small (large), its anterior lobe 
obtuse, and when depressed not reaching so far as (reaching well be- 
yond) the posterior lobe; height of anterior lobe less (more), than the 
base of the fin, which is little (considerably) longer than snout and less 
(more) than one-third the interspace between dorsals; the pectoral is 
comparatively short, not reaching to anterior third (reaching nearly to 
middle) of dorsal, or about half way to the beginning of the slit be- 
tween ventrals (half way to the base of the claspers). The snout in 
M. californicus is more pointed, the mouth narrower, its anterior angle 
more acute (obtuse); breadth between angles of mouth § (f) snout. 
Mustelus californicus reaches a larger size than M. canis. In Mustelus 
californicus the embryo is attached to the ])lacentoe. It therefore be- 
longs to the subgenus Pleuracromylon^^ Gill. 
Page 20. The genus Rhinotriacisf introduced on page 59, may be 
suppressed, “E. henleV^ being a species of Triacis, as given on page 20. 
Page 20 (GO). 20 (5), Rhinotriacis Iwvis^’ (or, better, Mustelus Iccvis 
Risso) should probal)ly be sui)pressed, as the evidence of its occurrence 
in our waters is insufficieut. 
