6. GINGLYMOSTOMATlDiE. 17 



canus (Storer) Gill) as distinct from the European, but uo reliable dis- 

 tinctions have been ])<>intedout. 



{Sqiiahtu acaitthiaft h. Sy.st. Nat. ; Acaiithias amcricanm Storer, Synopsis, r)06; Acan- 

 thiuK amcriranus Storer, Fisli Mass. 232 ; Acatithia-s vidffariii Giinther, viii, 418. Sfjualiis 

 sucldii (Grd.) Gill, Ironi the Pacific coast of the United States, is considered by Dr. 

 Giinther and others as the same species; Spinax {Ac(tHfhk,8) sucliii Girard, Proc. Ac. 

 Nat. Sci. rhila. 1854, 17f>; Squalu.s siirklii (iill, Proo. Ac. Nat. Sci. Phila. 1S62, 499.) 



12.— CEl\TROSrYI?INlIS Boca«e & Capello, lH(i4. 

 (Hoca^e A Capello, Proc. Zool. Soc. 1864,263; ty\wCcntros(>fmini><cfiloirpif<Bo{:. A-Cap.) 

 Dorsal fins ea(;li with a spine, which is hidden helow the skin; mouth 

 wide, but little arched; a long, deep, straight, oblique groove ou each 

 side of the mouth. Teeth of the lower jaw oblique, with the point more 

 or less directed outwards. Upper teeth lanceolate, on a (piadrangular 

 base, with a single cusj). Spiracles wide, behind the eye. Gill-openings 

 narrow, {/.hrfxr^, spine; rt-z''),','.vor, an ancient name of sonu' shark, from 



r;y.'i;iyn-_, W Hou's wliclp.) 



17. i\ <'<jelolepis Bocage & Capello. 



Labial groove prolonged forwards, but separated by a broad space 

 from that of the other side. Upper teeth very small, narrow and lan- 

 ceolate. The distance betMeen the nostrils is rather less than i- the; 

 length of th(^ prseoral portion of the snout. Lower angle of the pectoral 

 rounded, not produced. Dorsal fins short, especially the first, the 

 Icngtii ol which (without the spine) is only about ^ its distance from 

 the second. Extremity of the ventrals below the end of the second 

 dorsal. Scales oti the head and nape with striie, the others smooth, 

 with a dejiression at the base. Uniform blackish brown. {Giinther.) 

 Toast of Portugal and neighboring parts of the Atlantic, a specimen 

 taken near Gloucester, Mass. 



( 15()(-age ».\: Ca])ello, Proc. Zool. Soc. 18(i4, '263 ; Ccniropliorus cmlolcpis Giinther, viii, 423. ) 



Super-family SCYLLIOIDEA. 



{The ticyllioid Sharlcs.) 

 Family \ L— GINGLVMOSTOMATID.E. 



(The Mirsr Sharh.s.) 



Shai'ks with the first doisai <(h<>re or heliind the rr)ifrals ; no spines; 



anal tin present; caudal tin bent ni)\vaids, with a basal lobe; mouth 



inferior, with small teeth, in several scn-ies ; nostril (tontluent with the 



mouth; nasal valves of both sides forming a (piadrangular lla]» in front 



Bull. Nat. Mus. No. K) L' 



