40 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. XK 



Length of pectoral fin which is falcate 

 Do. dorsal fin which is falcate... 



Height of dorsal fin ... 



Width of gape 



Greatest height 



Do. circumference 



Smallest circumference at root of tail 



A single nasal aperture or blow hole on the top of the head. A 

 prenaria adipose elevation marked off by a V-shape groove. 



Vertebroe column. — Cervical 7, all fused together. Dorsal 13. 

 Lumbar 17. Caudal 24. — Total 61. Epiphyses distinct. Vertebrse 

 centra rather short. Sternum composed of presternum and two mesos- 

 terna ossified, with a cartilaginous xiphisternum. 



Ribs 13. Costal 7. Sternal 6, all ossified. The first four ribs two- 

 headed. 



Phalanges I 1, II 6, III 8, IV 1, V 1. II and III well developed. 



Skull. — Rostrum from anterior of the prenarial projection 4£in. 



Mandible 17|in., symphysis barely 2in. 



Teeth moderate |f and ||=51. Length of skull 20in. 



Breadth 8iin. between orbits. Pterygoids not meeting in the 

 middle line, borders divergent posteriorly. 



This is a slightly immature specimen. According to Blanford's 

 synopsis of the Indian Genera, it can only belong to the genus Tursiops, 

 but it differs from the genus in having the pterygoids separate, and it 

 differs in many respects from the only species Tursiops tursio described 

 by him. 



NOTES ON THE TRIVANDRUM CETACEANS, 

 By R. Lydekker, b.a., f.r.s., f.g.s., &c. 



The first of the two specimens referred to by Mr. Ferguson (PI. A) 

 is undoubtedly referable to the genus Pseudorca, and presents no 

 characters by which it can be distinguished from the widely distributed 

 False Killer (P. crassidens). As that species, which is new to the 

 Indian Fauna, never appears to have been properly figured, I have 

 thought it well to reproduce the excellent sketch sent by Mr. Fer- 

 guson. I do not attach any importance to the difference with regard 

 to the divergence of the pterygoid bones, nor in the number of verte- 

 bra (17 instead of 50). 



