1. Catodon macrocephalus, Gray, I. c. 196, f. 54, 202, 

 387. Hab. Tropical seas, accidentally in the temperate ones. 

 Mr. Flower (Trans. Zool. Soc. vi.) considers C. australis, 

 Gray, I. c. 206, fig. 55, the same species. 



II. Meganeuron, Gray, I. c. 386, 387. 



The atlas vertebra snbcircular, rather broader than high. 

 The central canal subcircular, in the middle of the body, 

 widened above. 



1. Meganeuron Krefftii, Gray, P. Z. S. 1865, p. 440; 

 /. c. 388, figs. 94-97. Hab. Australian Seas. 



Family VI. PHYSETERID.E. 

 (Physeterina, Gray, I. c. 386, 390.) 



Head depressed, rounded in front. Blowers linear (the 

 one on the left side often only open), at the back of 

 the forehead. Mouth small, inferior, rounded. Dor- 

 sal fin compressed, falcate. Pectoral fin elongate, 

 falcate. Skull short ; crown concave ; hinder part of 

 the wall formed by the maxillaries, and divided, as it 

 were, into two subequal parts by a central bony ridge, 

 which is more or less twisted towards the right side. 

 Upper jaw toothless. 



I. Physeter, Gray, I. c. 196, 211, 386. 

 Head large, rather depressed in front. Skull ? 



1. Physeter tursio, Linn.; Gray, I. c. 212. Hab. 

 North Sea, Scotland, Sibbald, 1687. Length 52 or 53 feet. 



II. Kogia, Gray, 1. c. 196, 215, 386, 391. 



Head moderate, blunt, and high in front ; left blower 

 only open. Skull short and broad; the septum that 

 divides the crown of the skull very sinuous, folded so as to 

 form a funnel-shaped cavity. 



1. Kogia breviceps, Gray, I. c. 217,391. Hab. Cape 

 of Good Hope. Perhaps the next is the same species. 



2. Kogia Macleayii, Gray, I. c. 391. Physeter simus, 

 Owen, Trans. Zool. Soc. vi. 30, t. 10, 11, 12, 13, $ (not 

 skeleton, t. 11. f. 2). Hab. Australia, India. Length 

 10 feet, young. 



The difference between Kogia and Euphysetes does not 

 depend on the sex of the aminals. Mr. Krefft described 

 a male, and Professor Owen a female, specimen ; the latter 

 mistook the two drawings of the same specimen for the 

 two sexes, deceived by certain additions surreptitiously 

 made to Mr. Elliot's drawings ; but these additions, es- 

 pecially the penis, is not represented on the Plates, and the 

 artist (Mr. Willis) says he received no directions to leave 

 out any part of the drawing, and accurately copied them. 

 The measurements given in the paper do not agree with 

 those in Mr. Elliot's notes made from the living animal, 

 and the references to them would have prevented all this 

 confusion. 



III. Euphysetes, Gray, I. c. 196, 215, 386, 392. 



Head moderate, blunt, and high in front. Skull short 

 and broad. The septum that divides the cavity of the 

 crown of the skull simple, longitudinal, only sbghtly 

 curved. 



1. Euphysetes Grayii, MacLeay ; Gray, 1. c. 218, 392. 

 Physeter simus, Owen, Trans. Zool. Soc. vi. t. 11. f . 2 

 (skeleton only). Hab. Australia. 



Suborder IV. SUSUOIDEA. 



Head beaked. Nostrils longitudinal, each covered with a 

 valve (the right often obbterated) . Teeth in upper and 

 lower jaws, compressed. Crown of skull covered with a 

 bony arch. 



Family VII. PLATANISTID^E, Gray, I. c. 52, 220. 



Head long-beaked. Jaws slender, compressed. Teeth 

 in both jaws, compressed. Skull — crown covered 

 with the converging arch and reflexed edges of the 

 maxillaries. 



I. Platanista, Gray, I.e. 221. 



1. Platanista gangetica, Gray, I.e. 223. Hab. India, 

 Ganges. 



2. Platanista Indi, Gray, I. c. 224. Hab. India, 

 Indus. 



Suborder V. DELPHINOIDEA. 



Nostrils two, united into a single central transverse or 

 crescentic blower on the back of the crown. Teeth 

 in both jaws, permanent. Pectoral fin lanceolate. 

 Head beaked. Dorsal fin falcate or wanting. Skull — 

 maxillary bone spread out over the orbit. 



Family VIII. INIID^E, Gray, I. c. 62, 226. 



Fluviatile. Head beaked; beak bristly. Teeth in the jaws 

 rugulose, crowus with an internal lobe ; permanent. 

 Back keeled behind, without any dorsal fin. Skull — 

 jaw compressed; symphysis of lower jaw elongate, 

 overlooking the front of the blower. Mr. Flower 

 places this genus with Platanistida. 



I. Inia, Gray, I. c. 226; Flower, I. c. 1. 



1. Inia Geoffroyii, Gray, I. c. 226, 393; Flower, Trans. 

 Zool. Soc. vi. 87, t. 25, 26, 27 (skeleton). D. amazonicus, 

 Spix. Hab. Brazil, River Amazons. 



Family IX. DELPHINID^, Gray, I. c. 230, 393. 



Head beaked. Teeth in both jaws, conical or compressed, 

 permanent, without any internal lobe, occupying 



