ICTICYON VENATICUS. 193 



The nasals extend backwards about as far as do the nasal processes 

 of the maxillae, and the outer margin of each nasal is somewhat 

 sigmoid. 



The mandible has a small, subangular process. The teeth are 

 remarkable for the absence or minute size of the second upper molar, 

 both above and below. The third upper premolar has its transverse 

 diameter remarkably large relatively to its antero-posterior extent. In 

 the skull preserved in the College of Surgeons the second upper molar 

 is very exceptionally present ; in the skull here figured, which is in 

 the British Museum, the second lower molar is exceptionally absent. 



The two halves of the mandible are anchylosed together. 



Centimeters. 



Length of cervical vertebrae 10*5 



dorsal 15'5 



lumbar 11'5 



sacral 2'5 



caudal 12'8 



Length from atlas to end of sacrum 40 '0 



Length of humerus 8'1 



radius 6'7 



femur 9*2 



tibia 8'2 



index metacarpal . 2 '6 



third 3-1 



metacarpal of pollex 1'2 



whole pollex 2*6 



last phalanx of third digit (manus) .... I'O 



index metatarsal 2*8 



third 3-3 



metatarsal of hallux 0'6 



whole hallux * 0'6 



last phalanx of third digit (pes) 0'9 



Basion to ovalion 2'6 



sphenoideum 3'9 



Sphenoideum to gnathion 7 '2 



Length of palate 5'5 



Breadth of 3'6 



* The hallux in the specimen examined had no phalanx. 



2c 



