66 MR. C. BODEN KLOSS ON 



swollen and convex, while the anterior edge of the pectoral fins 

 was more curved and a neck more evident, it closely resembled 

 the figure given by Anderson (Zool. Res. pi. xxv. fig. 4). 



Colour slaty-leaden throughout; greatest length, 3660 mm. 

 (7 ft.). 



Skull : greatest length (condylo-basal), 286 mm. ; basal length, 

 260; palatal length, 141 ; greatest breadth, 202; rostral breadth, 

 77. Length of mandible, 225. The skull is asymmetrical, par- 

 ticularly in the region of the nasal openings ; but asymmetry 

 seems to be the rule with this species. 



^ , R.16 L.15 , 



leeth, Ti Ti^ J TO '■■ all are worn down to mei^e flattened stumps 



and there are no signs of pi'emaxillary teeth. 



De Pousargues {loc. cit. supra) records a specimen from the 

 Mekong River. 



This species is very common along the Chantabun coast. 



While sailing from Klong Yai to Klong Menao we saw, late 

 in the afternoon of December 7th, numbers of white cetaceans 

 between ourselves and the shore. They presented a most bril- 

 liant appearance with the low sun shining on them, but none 

 came sufficiently near for details to be observed. They were, 

 however, of large size, as big as the present species, and I imagine 

 them to have been examples of Sotalia sinensis Flower. 



EXPLANATION OF THE PLATE. 



Map of the coast and islands of Soutli-East Siani) showing the places at which 

 collections were made by Mr. C. Boden Kloss. 



