154 BULLETIN 3G, UNITED STATES NATIONAL MUSEUM. 



of the length; long and but little elevated; caudal ridge.s proniiueut. 

 Breadth of flukes equal to one-fourth the total length. 



Color uniform plumbeous gray, except on the extremity' and under 

 side of the lower jaw, where it is white. 



Teeth f J. Eostrum of skull exceeding three-fifths the total length 

 of the skull, very narrow and obtusely pointed ; its breadth at the 

 middle one-sixth its length. Vomer not visible ou the palate. Tem- 

 poral fossa3 large and rounded, their length about equal to the breadth 

 of the rostrum at its base. Symphysis of the mandible about one-third 

 the length of the maudible. 



Measurements of the exterior (Pucheran). — Total length, 92.9 inches 

 (23G""); tip of snout to dorsal fin, 33.7 inches (85.5«^"'); to pectoral fin, 

 22.8 inches (oS'^''") ; to eye, 14:.9 inches (37.8'"') ; length of anterior margin 

 of dorsal fin, 16.7 inches (42.5''"' ) ; its vertical height, 5.9 inches (15'''"); 

 length of anterior margin of pectoral fin, 13.8 inches (35*''") ; breadth of 

 flukes, 21.7 inches (55^'"). 



' Measurements of the skull. — Total length,55.9'^'"' ; length of beak, 34.9'^'" ; 

 breadth of beak at base, 11.3'^^'"; at its middle, 4.3"="; breadth between 

 orbits, 19.2<="'; length of temporal fossa, 11.2"". 



Habitat. — Indian Ocean. Malabar coast, India {Dussumier). 



SOTALIA GAUAMU (Owen). 

 (Plate 2, figs. 1 and 2.) 



Bodj' fusiform, gaining its greatest diameter at the fore part of the 

 dorsal fin. Forehead convex. Snout long and comnressed. Pectoral 

 and dorsal fins falcate and of about equal size; the former commence 

 at the beginning of the second fourth of the total length of the bodj'. 



Color of body "dark plumbeous grey, almost black upon the fins, 

 especially at their fore part, becoming very gradually lighter to tlie 

 longitudinal parallel of the attachment of the pectorals, below which 

 the body, from beneath the base of the snout and eye to below the base 

 of the tail, is of a pin kish ashy-grey tint, with a few small irregular 

 blotches of light plumbeous grey" (Owen). 



Tee^h ^. Eostrum of skull less than three-fifths the length of the 

 skull, depressed, and obtusely rounded oft" in front; its breadth at the 

 middle about one-fifth its length. Vomer visible in the center of the 

 palate. Pter^-goids narrow, curved outwards, and sharply keeled. 

 Length of the temporal fossa) only a little less than the breadth of the 

 beak at its base. Length of the symphysis of the mandible somewhat 

 less than one-third the total length of the mandible. 



Measurements of the exterior. — 9 adult (Owen): Total length, 82 

 inches (209.1""); tip of snout to dorsal fin, 36 inches (91.8""); lengtli of 

 pectoral fin (along anterior margin), 18 inches (45.9'""'); length of base 

 of dorsal fin, 13 inches (33.2'^'"); breadth of flukes, 22 inches (56.1'""). 



Measurements of the sicull. — (82, 1, 2,3, British Museum): Total length, 



