SCOLIODON LALANDII. 113 



less depressed in forehead and snout, is narrower in the snout and deeper in the 

 head and more pointed anteriorly, has a smaller mouth, has much shorter labial 

 folds around the buccal angles, where the folds extend but little on the lower 

 jaws and not much more on the upper, has the cutting edges of the teeth weakly 

 serrated and somewhat curved, lias wider gill openings, has longer more falci- 

 form and acute pectoral fins, has a taller first dorsal that, is more pointed on the 

 upper angle, has a much deeper and sharper subcaudal lube, has much deeper 

 excavations behind anal and subcaudal, has larger flatter scales commonly 

 quinque-carinate with extremities of the median keels less produced than those of 

 S. terrae novae, anil it has the bases of the second dorsal and the anal almost 

 directly opposed, though the end of the latter extends slightly farther back. 

 Cuba. No. 1380 M. C. Z. 



SCOLIODON LALANDII. 



Carcharias (Scoliodon) lalandii Muller & Henle, 1841, Plagios., p. 30; Dumeril, 1865, Elasm., p. 346. 

 Scoliodon terrae novae Ribeiro, 1907, Arch. Mus. nan., 14, p. 138. 



Head long; snout elongate, pointed, sharper and longer than that of S. 

 terrae novae, nostrils at about two sevenths of the distance from the mouth to the 

 end. Mouth large, width greater than the length; labial fold on upper jaw 

 nearly one third of the length, lower little shorter. Teeth in || rows, broad 

 based, with slender cusps turned toward the angle of the mouth and slightly 

 curved toward the opposite teeth, and with a notch above the base on the outer 

 edge. Eye large, midway from first gill cleft to end of snout. Gill openings 

 as wide as the orbit. Nictitating membrane below and somewhat in front of the 

 eye. Pectorals medium, reaching the dorsal; angles rounded. Origin of first 

 dorsal above the inner angle of the pectoral, produced extremity not quite 

 reaching a vertical from the origin of the ventrals. Base of second dorsal half 

 as long as that of the anal, or one fourth of that of the first dorsal, one third 

 above the end of the anal base. Second dorsal fin ending one length of the base 

 forward of the caudal, and two and one half lengths behind the base of the first 

 dorsal. Tail one fourth of the total length. Caudal large, end pointed, angles 

 rounded, lower lobe deep and rather wide, blunt. 



Slaty brown to olivaceous on back and fins, shading to white below, from 

 the middle of the flank; hind borders of fins light. 



Scoliodon terrae novae has the snout broader, the nostrils farther forward, 

 the hind margin of the first dorsal more excavated, more nearly vertical, and 

 the fin smaller. Scoliodon longurio also has the nostrils farther forward, the 



