2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 



Feet Inches 



Total length 16 o 



Width of flukes, about 4 8 



Tip of snout to origin of dorsal fin 9 o 



Tip of snout to origin of pectoral fin 3 8 



Tip of snout to vent n o 



Length of pectoral i S 



Greatest depth of body 3 5 



Back, slate-black ; lower side, yellow-purple, flecked with black ; 

 median line of belly somewhat darker : a grayish area in front of 

 vent ; fins the color of the back. 



A mold of the head was made at the U. S. National Museum, 

 after which the skull was extracted and cleaned. The dimensions 

 of the latter are as follows: 



Dimensions of the type-skull. — Total length, 810 mm. ; length of 

 rostrum, 496 ; length from tip of rostrum to posterior end of ptery- 

 goids in median line, 618; greatest height from vertex to inferior 

 border of pterygoids, 301; breadth across centers of orbits, 325; 

 breadth between zygomatic processes, 345 ; breadth between bases of 

 anteorbital notches, 210 ; breadth at middle of beak, 60 ; breadth across 

 occipital condyles, 125; breadth of expanded proximal ends of pre- 

 maxilla? behind anterior nares, 142; least breadth of premaxillse 

 opposite anterior nares, 118; breadth of premaxillae opposite premax- 

 illary foramina, 68 ; least breadth of anterior nares, 56 ; least distance 

 between maxillary foramina, 92 ; distance from posterior border of 

 maxillary foramen to end of maxillary protuberance, 63 ; length of 

 portion of vomer visible on palate, 162; length of mandible, 668; 

 length of symphysis, 193 ; greatest height of mandible opposite 

 coronoid process, 117. 



This species belongs to the section of the genus in which the 

 basi rostral groove is lacking. It differs from all known species, 

 except hectori, in that the mandibular teeth are at the extremity of 

 the jaw. From heetori it differs in the greater breadth of the cra- 

 nium, the size and shape of the maxillary ridges, or prominences, 

 and anteorbital notches, the much shorter vertex, and other 

 characters. 



