870 CONTEIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



torals short and broad. First dorsal inserted near middle of length of 

 body 5 caudal not large. {Gar man.) Deep water, off the coast of Vir- 

 ginia; one specimen known. 



(ScylUuin retiferum Garman, Bull. Mus. Comp. Zool. xi, 2;53, 1881.) 



Page 18. Instead of Galeorhinidw, read : 



Family VJI.— CARCHARIID^. 



On page 19, instead of Mustelus Mnnulus, read: 



19. M. canis (Mitch.) Dek. 



Add to the synonymy: 



(" Squalus canis Mitch. Trans. Lit. & Phil. Soc. N. Y. 1, 486, 1815: Mustelus asterias 

 Cloquet, Diet. Sci. Nat. xiv, 407, 1820: Muslelus plebejus Bouap. Fauua Italica, 1838, 



49.") 



Page 20, si)ecies 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 comi^ared with 31. canis, the differential characters of the 

 latter species being interposed in parenthesis: In No. 20, M. californi- 

 cus Gill, the dorsal fin is comparatively small (large), its anterior lobe 

 obtuse, and when depressed hot 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 -| {^) snout. 

 Mustelus californicus reaches a larger size than 3f. canis. In Mustelus 

 californicus the embrj^o is attached to the placenta?. It therefore be- 

 longs to the subgenus '•'• Pleuracromylon'^'' Gill. 



Page 20. The genus ^^ Rliinotriacis^''^ introduced on page 59, may be 

 sui>pressed, ''i2. Iwnlei^^ being a species of Triads, as given on page 20. 



Page 20 (60). 20 (b), '■'■ Rhinotriacis Icevis''^ (or, better, Mustelus lasvis 

 Risso) should i)robably be suppressed, as the evidence of its occuirence 

 in our waters is Insufficient. 



