36 Bulletin 47, United States National Museum. 



40. CARCHARHINUS PLATYRHYNCHUS, (Gilbert). 



Snout moderate, not pointed, very flat, and broadly rounded ; its length 

 from mouth slightly greater than width of mouth, and less than width of 

 eiiout opposite nostrils. No labial folds ; nostril flap without acute lobe; 

 upper teeth broadly triangular, coarsely serrate, the inner edge oblique, 

 the outer more or less definitely notched; lower teeth narrow, erect; eye 

 moderate. Pectorals little falcate, long, reaching beyond base of first dor- 

 sal, the fin about i as broad as long ; first dorsal inserted close behind pec- 

 toral, its distance from pectoral f its base; its base 2 times in interspace 

 between dorsals, and less than its height, which is less than depth of body ; 

 second dorsal inserted over anal, its base 3 in first dorsal, the fin smaller 

 than anal; caudal 3 in total length. Light gray, the fins colored like 

 the body. Magdalena Bay to Galapagos Islands ; probably not rare. Re- 

 sembles C. lamiella, from which it differs in dentition and in position of 

 first dorsal. (TrAar^f, flat; p^y^of, snout.) 



Etilamia ylalyrhynchiis, GILBERT, Proc. U. S. Nat. Mus., 1891, 544, Clarion Island, Socorro 

 Island, Magdalena Bay. 



41. CARCHARHINUS FALCIFORMIS, (Bibron). 

 (CAZON DE PLATA.) 



Snout moderately prolonged and acute; nostrils without lobe; first 

 dorsal rather backward ; second dorsal and anal opposite each other and 

 of medium size ; pectorals not twice as long as broad ; upper teeth with a 

 marked reentrant angle on the outer border; 2 pores on the nape, well 

 marked. Color, blue-black, deeper than in any other species. L. 10 feet. 

 (Poey.) Cuba and neighboring waters, (falx, scythe; forma, form.) 



Carcharias falciformis, BIBRON, in Miiller & Henle's Plagiostomen, 47, 1838, Cuba. 

 Sqiialus liburo, POEY, Memorias, 11, 331, 1861, Havana. 

 Platypodon faltiformis, POEY, Enumeratio, 191, 1875. 



42. CARCHARHINUS ACRONOTUS, (Poey). 



Close to C. falciformis, but with an acute lobe to the nostril ; first dorsal 

 farther forward ; the second dorsal and anal larger ; pectoral scarcely 

 falciform; nuchal pores inconspicuous; color yellowish brown. (Poey). 

 Cuba, (fl/cpof, sharp; vwrof, back.) 

 fyualus acronotus, POEY, Memorias, n, 335, 1861, Havana. 



43. CARCHARHINUS PEREZI, (Poey). 



Snout rounded, its length from mouth f width of mouth, and about 

 equal to length of mouth (measured from the line connecting the 

 angles) ; teeth oblique, with a deep notch on outer margin ; lower teeth 

 narrow ; Nostril with a small, sharp lobe. Pectoral falciform, rather 

 large. First dorsal acute, inserted near tip of pectoral ; anal opposite 

 second dorsal, which has a base nearly \ as long as that of first dor- 

 sal. Gray, tips of fins dusky. Cuba. (Named for Don Laureano Perez, 

 of the University of Madrid.) 



Platypodon perezi, POEY, Enuineratio, 195, 1875, Cuba. 



