8430 The Zoologist— March, 1873. 



i. Beluga. — Male without any spiral horn-like toolh. Fingers 

 short. Metacarpal bones surrounded with cartilage. Blade-bone 

 with a large coracoid and acromion process. Second cervical 

 vertebra with a large dorsal process. 



1. Beluga caiodon (the Beluga or White Whale). — Inhabits 

 North Seas, entering the mouths of rivers in " schools." Scotland ; 

 Sibbald. Mr, Cope has divided the arctic specimens into four 

 species, from slight differences in the attachment of the cervical 

 vertebrae, the number of ribs, and the form of the acromion. 



ii. MoNODON. — Male with one very long, projecting, spiral tusk 

 in the left side of the upper jaw. Rarely the tusks on both sides 

 are developed, and they rarely occur in the female. Cervical 

 vertebrae : first free, thin ; second and third united by the spinal 

 processes, Bladebone with large coracoid and acromion process. 

 Fingers short. 



1. Monodon monoceros (the Narwhal). — Inhabits Arctic Ocean, 

 incidentally on the coasts of Scotland and England, and Isle of 

 May, 1648; Zetland, 1808; Lincolnshire, 1800. 



Sub-order V. Ziphioidea. 

 Head beaked. Nostrils two, united into a single transverse or 

 crescent-like blower on the centre of the back of the crown. 

 Teeth only in the front or sides of the lower jaw, fitting into 

 pits in the upper one. Dorsal fin falcate. Pectoral fin ovate, 

 small, low down on the side of the body ; fingers short, four- 

 or five-jointed; second and third the longest; fourth rather 

 shorter; first and fifth rather short. Cervical vertebrae more 

 or less united into one mass. 

 Allied to the Physeteroidea, but with a transverse instead of a 

 longitudinal nostril. Indeed these sub-orders form two parallel 

 series. (See Suppl. Cat. Seals and Whales, 1871, p. 57.) 



Family XI. HyperooDontid.e. — Beak of the skull with a high 

 crest on each side above, formed by the elevation of the maxillary 

 bones in front of the blower. Teeth two or four in front of the 

 lower jaw, cylindrical, conical. Cervical vertebrae united into one 

 mass. 



O. Fabricius and Turton by mistake state the teeth to be in the 

 upper jaw, and Illiger's name is founded upon this error of the 

 press. 



