CATODONTIDiE. 195 



A. Kostrils longitudinal, parallel or diverging, covered with a valve, one often 

 larger and tnore developed. Pectoral broad, truncate. Fingers 5. 

 Physeteroidea. 



Family 3. CATODONTID^. 



Head large, subcylindrical, blunt. Lower jaw narrow. Teeth 

 large, in the lower jaw only, fitting into pits in the gums of the 

 upper one. Nostrils separate, one often abortive. The hinder edge 

 of the maxillary elevated, forming a concavity on the forehead of 

 the skull. Pectoral broad, truncated. Fingers 5. Eye and limb 

 of left side smaller ; left nostril very large. The lower jaw is early 

 joined in front into a subcylindrical mass ; the branches converge 

 and nearly straight. 



Delphinia Catodouia (pars), Hafin. Anal. Nat. 60, 1815. 



Cete Carnivora (pars). Lesson, N. Reg. Anim. 20l. 



Physeterefe, Lesson, N. Reg. Anim. 201. 



ZalinwaUe (pars), Oke7i, Lehrb. Naturg. G72, 1815. 



Physeteridfe sen Hypodontia, J. Brookes, Cat. Mas. 38, 1828. 



Catodon, Artedi, Gen. Piscium, 78, Ichth. 



Les Cachalots, Duvernoy, Ann. Set. Nat. 1851, 23. 



Catodontida;, Gray, Cat. Cetac. B. M. 1850, 44; P. Z. S. 1804, 231 ; 



MacLeay, Neio Sperm Whale, 1851, 63. 

 Physeteriens, Geoff. Legons, Mamm. 1835, 66. 

 l)er Cachalots (Physeter), Schlegel, Abhandl. 24, 

 Physeteridse, Owen, Cat. Osteal. Mus. Coll. Surg. ii. 442. 



" Upper surface of massive skull concave for the recejition of sper- 

 maceti. Nostrils enormously disproportionate in size, the left one 

 the largest. The nasal bones as well as those of the face generally 

 unsymmetrical and distorted. Blowhole externally single (in all ?). 

 Branches of the toothed lower jaw united in front by a bony sym- 

 physis, which is always considerably narrower than the toothless 

 upper jaw. Teeth of the under jaw conical, hollow, like those of a 

 crocodile, and fitting into cavities formed in the gum of the upper 

 jaw." — MacLeay, 1. c. p. 63. 



" The Cachalots or ' Sperm Whales,' Catodontidoi of Dr. Gray, I 

 humbly consider to constitute a subfamily rather of Delphinidce, 

 especially since the discovery of that very remarkable small species, 

 the Euphysetes Grail of Mr. W. S. Wall"— Blyth. Mr. W. S. Mac- 

 Leay discusses this question in his ' History and Description of a 

 new Sperm Whale,' set up by Mr: W. S. Wall. 



* Synopsis of the Geneea. 



1. Head compressed, truncated in front. Bloivers in front of upper part 

 of head. Skull elongate. Dorsal hump rounded, 



1. Catodon. 



o2 



