3424 The Zoologist— March, 1873. 



i. Physeter. — Head large, rather depressed in front. — Cat. of 

 Get. B. M., t. ii. f. 4, head (from Sibbald). Skull ? 



1. Physeter tursio (Black Fish). Physeter tursio, Linn. ; Gray, 

 I.e., p. 212; Synops. Whales & Dolph. p. 4. — Inhabits North Sea. 

 Scotland; Sibbald, 1687. Length 52 or 53 feet. This species is 

 only known from Sibbald's description, but there are many other 

 whales, like the flat-back {Sibbaldius borealis)^ which have only 

 occurred so as to be zoologically examined once, even when there 

 are persons in England, and in different parts of Europe and 

 America, paying great attention to whales, and three other species 

 of this family were perfectly unknown a few years ago. 



Division IL Nostrils both untied into a single central transverse or 

 crescent-shaped blower on the back of the crown. 



Sub-order IV. Delphinoidea. 



Nostrils two, united into a single central transverse or crescentic 

 blower on the back of the crown. Teeth in both jaws per- 

 manent, or rarely deciduous by age. Pectoral fin lanceolate, 

 ovate, or truncated. Head generally beaked. Dorsal fin 

 falcate or wanting. Skull beaked ; maxillary bone spread out 

 over the orbit. 



I. Pectoral fin elongate, obliquely truncated on the inner side. 

 Fingers elongate, longer than the arm-bones, unequal ; the 

 second and third much the longest ; the rest short. Fore-arm 

 bones close together, only separated by a straight line. Carpal 

 bones moderate, five or seven. 



A. Pectoral fin on the side of the body. Second and third fingers 

 of six or eight phalanges. 



Family VI. Delphinid^e.— Head beaked. Teeth in both jaws, 

 conical or compressed, permanent, without any internal lobe, 

 occupying nearly the whole length of the jaw. Back rounded, 

 with a falcate dorsal fin; rarely absent. Skull with the maxilla 

 expanded over the orbit, and more or less turned up on the edges. 



Tribe I. Delphinina. — Head beaked. Teeth conical. Beak of 

 the skull elongate, longer than the brain-cavity, depressed, broad, 

 shelving on the sides. Nasal triangle short. Symphysis of the 

 lower jaw very short, sloping. Dorsal fin subcentral, rarely wanting 



