Jordan and Everinaiin. — Fishes of jVor/h America. 



17. PSEUDOTRIAKIS. Capello. 



Pseudolriahs, Capeli.o, Juur. Sci., Math., Phys., Nat., Lisbon, LSOM, :i-21, (microdnn). 



Characters of the genus given above, {^evdyg, false; Triakis.) 



'»!). rSEl'DOTRIAKIS MICRODOX, f'.apollo. 



Grayish brown, the fins, except the first dorsal, edged with dusky; 

 base of first dorsal 7 times its height. Two specimens of this species are 

 known — the type from Portugal; the second, 10 feet in length, taken at 

 Amagansett, on Long Island. (fiiKpng, small; diovc;, tooth.) (Eu,) 



Pseudotridlds microdon, Capelio, Jour. Sci., Math., etc., Lisbon, 18CS, ^21, Portugal ; Gi'NTiiF.it, 

 Cat., VIII, 395, 1870 ; Bean, Proc. U. S. Nat. Mus., 1883, 147. 



Family XI. GALEID^. 

 (The Requiem Sharks.) 



Sharks with 2 dorsal fins, the first short and high, entirely before the 

 ventruls, the second comparatively small, opposite the anal ; no spines; 

 gill openings moderate, the last above the V)ase of the pectorals; tail 

 more or less bent upward from the base of the caudal fin ; sides of tail 

 not keeled; eyes with nictitating membranes; head not hammer-shaped, 

 the snout being longitudinally produced, as usual among sharks. Ovo- 

 viviparous. Spiracles small or obsolete. 



A large family of 20 or more genera and about 60 species; found in all 

 seas. The species are often closely related and difficult of determination. 

 (Carchariid.e, part (Carchariina and Mustelina), Gunther,Cat., viii, 

 357-380, and 383-388.) 



a. Galein.e; T''Pth flat ami p.aved, vitbuiit cusps or ridges; spir.acles present; no pit at root of 

 tail; laliial folils well developed. 

 h. Embryo not attached to the uterus by a placenta; teeth very Vdunt. Mu.stelus, 18. 



hh. Embryo attacbed to the uterus by a placenta; teeth more acute. Galeus, 19. 



an. Teeth more or less compressed, with entire or serrate sharp edges. 

 Galeorhinin.t:: 

 c. Spiracles present. 



d. Root of tail without pit. 



e. Teeth rather small, each with a medium cusp and 1 or 2 small latersil cusps 



on each side. 



/. Teeth .«mall, close-set, ai)proachiug- those of Gah'iti< but with pointed cusps; 



snout slender; embryo attached to uterus by a placenta. (Coloration 



plaiu.) KuiNoTniAcis, 20. 



Jf. Teeth larger, with sbarp cusps; snout of moderate length; embryo not 



attached to uterus by a placenta. (Poloration variegated.) 



Triakis, 21. 



ee. Teeth larger, with a single cusji, iibli(]uc, notrbed and coarsely serrated on 



the outer margin. Galeorhinus, 22. 



dd. Root of tail witliout couspiruons jiil above; teeth .all coarsely serrate, alike in both 



jaws and all with a deep notch on outer margin; caudal fin with .a double 



notch. (^.ai,f.oceri>o, 23. 



