8. GINGLYMOSTOMATID^E. 17 



canus (Storer) Gill) as distinct from the European, but no reliable dis- 

 tinctions have been pointed out. 



(Sqitalus acantkias It. Syst. Nat. ; Acanthias americanus Storer, Synopsis, 506; Acan- 

 th'utH americanus Storer, Fish Mass. 232; Acanthias vnlgarls Giiuther, viii, 418. Squalus 

 mil-kin (Grd.) Gill, from the Pacific coast of the United States, is considered by Dr. 

 Giinther and others as the same species ; Spinax (Acanthi^.?) sucklii Girard, Proc. Ac. 

 Nat, Sci. I'hila. 1854, 176; Squalus sucklii Gill, Proc. Ac. Nat, Sci. Phila. 1862, 499.) 



12. CENTROSCimiNlTS Bocage & Capello, 1864. 



(Bocage & Capello, Proc. Zool. Soc, 1864,263; typeCentroscymnmccplolepiaTSoc. &Cap.) 

 Dorsal fins each with a spine, which is hidden below the skin; mouth 

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

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

 or less directed outwards. Upper teeth lanceolate, on a quadrangular 

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

 narrow, (zlv-pov, spine; ff-/.b>j.v<>-, an ancient name of some shark, from 

 f;y.t'>;t.vt>-, a lion's whelp.) 



17. C. coeSoIepis 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 between the nostrils is rather less than 4- the 

 length of the pneoral portion of the snout. Lower angle of the pectoral 

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

 length of which (without the spine) is only about ^ its distance from 

 the second. Extremity of the veutrals below the end of the second 

 dorsal. Scales on the head and nape with stride, the others smooth, 

 with a depression at the base. Uniform blackish brown. (Giinther.) 

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

 taken near Gloucester, Mass. 



(Bocage & Capello, Proc, Zool. Soc. 1864,263; Ccnfrophoruscoelole^is Giinther, viii, 423.) 



SUPER-FAMILY SCYLLIOIDEA. 



(The Scyllioid Sharks.) 

 FAMILY VI. GINGLYMOSTOMATID^E. 



(The Nurse Sharks.) 



Sharks with the first dorsal above or behind the ventrals ; no spines; 



anal fin present; caudal fin bent upwards, with a basal lobe; mouth 



inferior, with small teeth, in several series ; nostril confluent with the 



mouth ; nasal valves of both sides forming a quadrangular flap in front 



Bull. Nat. Mus. iso. 10 2 



