WIST INDIAN SEAL. 



335 



ferences of external proportions which cannot be determined from the 

 scanty material now at OUT command. 



Specific diagnosis. 



Monachus tropicalis, Gray. 



tropioalii, Grey, Cat. Mam. Brit. Mus., pt. ii, Seals, 1850, p. 28. 

 Pkoca WiVeianui, Gosse, Naturalist 1 ! Sojourn in Jamaica, 1857, p. 308, foot-note. 

 Monaoku* tropicalis, Gray, Cat. Seals and Whales Brit. Mus., 1866, p. 20. 

 " Alomu litis t tropicalis, (Jray," 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 palms 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. 



Measurements of the skulls of Monachus albiventer (from Cuvier, Oss. Foss., viii, 1836, 

 442) and Monachus tropicalis. 



Measurements. 



M. tropicalis. 



lOOths. 



M. albiventer. 



lOOths. 



Summit of occipital crest to anterior borders of premaxillariea . . 



Ditto to anterior extremity of nasals 



Greatest breadth between zygomatic arches , 



Least 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 tho alveolar border of the maxillary to the anterior ex- 

 tremity of thet'rontals , 



Height of foramen magnum , 



Width of foramen magnum. .• 



Length of superior molar series , 



Distance between outer borders of last molars 



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 Beries 



Distance between outer Burface 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 



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 



91 

 23 

 27 

 65 

 84 

 48 

 210 

 63 

 102 

 161 

 190 

 58 

 54 

 51 



100. 

 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 

 36.3 

 57.1 

 67.4 

 20.6 

 19.2 

 18.0 



