^^^:ST Indian seal. 



335 



fereuces of external proportions which cannot be determined from the 

 scanty material now at our command. 



Specific diagnosis. 



MoNACHUS TKOPiCAJLis, Gray. 



I'huva trvpimlis. Gray, Cat. Mam. Brit. Mas., pt. ii, Seals, 1850, p. 26. 



Phoca Wilkianus, Gobse, Naturalist's Sojourn in Jamaica, 1857, p. 308, foot-note. 



MonacliHi IropicaUs, Gray, Cat. Seals and Whales Brit. Mua., 1866, p. 20. 



" Monachus f tropicalia, Gray," Allen, Monogr. N. A. Pinnipeds, 1880, p. 708. 



Color above umber-brown. Below slightly lighter and tinged with 

 yellow. Flippers of the color of the back. Lips bordered with white. 

 Soles and i)alms clothed with short hair. 



Skull. — Forehead depressed. Condyles of mandible on a level with 

 the alveolar border of the jaw. Length of the molar series one-third 

 that of the skull. Last upper molar smallest. 



Meusurementa of the skulls of Monachus uliiventer {from Cuvier, Oas. Foss., viii, 1836, 

 442) and Monachus tropicalia. 



Measurements. 



M. tropicalia. 



lOOths. 



M. albiventer. 



lOOths. 



Summit of occipital crest to anterior borders of premaxillaries. .. 



Ditto to anterior extremity of nasals 



Greatest breadth between zyRomatic arches 



Lea.st breadth of interorbital ridge 



Breadth of muzzle on a line with the incisors 



Height from lower border of occipital condyles to summit of 

 occipital crest 



From the alveolar border of the maxillary to the anterior ex- 

 tremity of tlio frontals 



Heipht of foraiueu magnum 



Width of foramen niaguum 



Length of superior molar series 



Distance between outer borders of last molarB 



Ditto of first molars 



Total length of lower jaw 



Angle of mandible to upper surface of condyle , 



Angle of mandible to extremity of coronoid process 



Distance between outer borders of coronoid processes 



Distance between external extremities of condyles , 



Length of the symphysis mandibuli , 



Length of the lower molar series 



Bistance between outer surface of canines , 



193 

 152 

 122 

 25 

 45 



70 



45 

 27 

 33 

 60 

 63 

 35 



134 

 27 

 45 

 89 



112 

 37 

 60 

 27 



100.0 

 78.9 

 63.1 

 13.1 

 23.6 



36.8 



23.6 

 14.4 



17.0 

 31.5 

 32.8 

 18.4 

 69.7 

 14.4 

 26.3 

 46.0 

 57.8 

 19.7 

 31.5 

 14.4 



282 

 219 

 215 

 32 

 78 



96 



01 

 23 

 27 

 65 

 84 

 48 

 210 

 63 

 102 

 161 

 190 

 58 

 54 

 51 



100.0 

 77.7 

 76.2 

 11.3 

 27.7 



34.0 



32.3 

 8.2 

 9.6 

 23.1 

 29.8 

 17.0 

 74.5 

 22.3 

 30.3 

 57.1 

 67.4 

 20.6 

 19.2 

 18.0 



