1876.] DR. J. V. HAAST OX OULODON. 457 



which the Miocene R. pachygnathus, Wagner, from Pikermi, is the 

 earliest known form, and the four extinct British species, R. etrus- 

 cus, Falc, R. leptorhinus, Cuv., R. hemitcechus, Falc, and R. 

 tichorhinus, Cuv., are more or less modified members. Tiie 

 recently discovered R. deccanensis, Foote, from South India, appears 

 to belong to it also. The several species found in the Siwalik 

 beds and other parts of South Asia appear to have belonged to the 

 genus Rhinoceros as restricted above, with large incisors and one 

 horn. 



To include all the extinct members of the family at present known ; 

 the genus Aceratkerium, Kaup, must be added for the species with 

 no horn, large incisors, and four toes on the fore feet, Dicer at herium, 

 Marsh, for species with indications of a pair of lateral horns on the 

 nasals, and Hyracodon, Leidy, for primitive forms without horns and 

 retaining the complete number of forty-four incisor, canine, and 

 molar teeth, the latter of comparatively simple structure without 

 crochet or crista. When we extend our search for Rhinocerotidse 

 beyond the Miocene period, we find that they cease to be recogni- 

 zable as such, and become merged into more generalized perisso- 

 dactyle forms. 



4. Further Notes on Oulodon, a new Genus of Ziphioid 

 Whales from the New-Zealand Seas. By Julius von 

 Haast, Ph.D., F.R.S., Director of the Canterbury Mu- 

 seum, Christchurch, New Zealand. 



[Received May 1, 1876.] 



It will be seen from the following notes that the presence of a row 

 of small teeth in the upper jaw is a constant character in rny Mesop- 

 lodon yruyi (P. Z. S. 1870", p. 7) ; and unless it shall be shown by 

 future researches that other species belonging to the genus Mesop- 

 lodon have similar rows of small teeth and of a permanent character 

 in the upper jaw, I think that the generic term Oulodon ought to be 

 applied to the Ziphioid Whales distinguished by that peculiar feature, 

 which, so far as I am aware, no others of the group possess. 



Since I had the pleasure to lay the description of the three skulls 

 obtained on the Chatham Islands before the Society, four specimens 

 belonging to the same Ziphioid, which with our local fishermen goes 

 under the name of Cowfish, have been stranded on the coast near 

 Saltwater Creek, about 30 miles north of Banks Peninsula. One of 

 them, a small male (A) about 13 feet long, was washed ashore on the 

 15th of December, 1875. On the 29th of December another male 

 (B), 12 feet 9 inches long, was stranded, together with a female 

 (D), 17 feet (j inches long, on the beach a short distance north of 

 the entrance of the Saltwater-Creek Estuary; whilst another male 

 (C), 13 feet 8 inches long, ran the same day into that small estuary, 

 and was left high and dry by the receding tide. 



