Jordan ami Ever ma nn. Fishes of North America. 27 



17. PSEUDOTRIAKIS, Capello. 



PteudotriaJdn, CAPELLO, Jour. Sci., Math., Phys., Nat., Lisbon, 1868, 321, (microdon). 



Characters of the genus given above, (ipevdf/c, false; Triakis.) 



21). rSEUDOTRIAKIS MICRODON, Capello. 



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, (ftiicpbe, small ; bdovg, tooth.) (Eu.) 



r,'nilr>fri<(kis nricroilon, CAPELLO, Jour. ci., Math., etc., Lisbon, 1868,321, Portugal ; GUNTHER, 

 Cat., vin, 395, 1870; BEAN, Proc. U. 8. Nat. Mus., 1883, 147. 



Family XI. GALEID^E. 

 (THE REQUIEM SHARKS.) 



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

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

 gill openings moderate, the last above the base 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, ns 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), Giinther, Cat., vm, 

 357-380, and 383-388.) 



a. GALEIN/E: Teeth flat and paved, without cusps or ridges; spiracles present; no pit at root of 



tail ; labial folds well developed. 



6. Embryo not attached to the uterus by a placenta; teeth very blunt. MUSTELUS, 18. 

 bb. Embryo attached to the uterus by a placenta; teeth more acute. GALEUS, 19. 



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

 GAJJEOKHININJE: 

 r. Spiracles present. 



d. Root of tail without pit. 



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



on each side. 



/. Teeth small, close-set, approaching those of Galeus but with pointed cusps; 



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



plain.) HHINOTRIACIS, 20. 



/. Teeth larger, with sharp cusps; snout of moderate length; embryo not 



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



TRIAKIS, 21. 



ee. Teeth larger, with a single cusp, oblique, notched and coarsely serrated on 



the outer margin. GALEORHINXTS, 22. 



dd. Root of tail without conspicuous pit above; teeth all coarsely serrate, alike in both 



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



notch. GALEOCERno, 23. 



