4 Journal of the FM.S. Museums. [Vol. X, 



markedly from what appears to be the normal, that I have 

 refrained for the present from making any diagnosis of 

 them! A good illustration of this anomaly will be found 

 under Hydrophis viperina, a snake possessing so many 

 unique features that there can be no doubt of its identity. 



The measurements of length given are in many cases 

 approximate only. It is impossible with a specimen coiled 

 up and hardened by alcohol to be exact. Where total 

 lengths are concerned a slight discrepancy is of little impor- 

 tance, but in connection with the sexual variation in the 

 length of the tail, it is of considerable value. 



A full list of all the specimens examined has not been 

 given in every case. In dealing with large numbers of a 

 common form this has seemed imnecessary. In other 

 instances the specimens had been given away to various 

 Museums before a register of them was undertaken. 



The following places are mentioned as having been 

 collected in : — 



In the Gulf of Siam. 



Meklong or Meklawng, Tachin, Bangpakong, 

 Chantabun, Ban Yao, — ^fishing villages at the movi^^ of the 

 rivers of those names at the head of the Gulf. A reference 

 such as Chantabun implies the mouth of the Chantabun 

 river, not Chantabun town. 



Koh Kong, a small island ofl' the coast of Cambodia, 

 just beyond Siamese territory. 



Hua Hin, a fishing village on the west side of the Gulf, 

 80 km. south of the mouth of the Meklawng river, the 

 nearest fresh water to this village being at 



Pran, 20 km. south. 



Chumpon, Langsuan, Bandon, Singgora, on the east 

 coast of the peninsular portion of Siam. 



Bangnara in Patani, and Trengganu, on the east coast 

 of the Malay Peninsula. 



In the Straits of Malacca. 



Kuala Kurau, Kuala Larut, Londang, on the coast of 

 Perak. 



Bagan Datoh, in the estuary of the Perak river. 



Pulau Angsa, 8 km. otf the coast of Selangor, a purely 

 salt water islet. 



Bernam River, Selangor. 



Trang, 120 km. south of the island of Puket (Junk 

 Seylon) . 



In Cochin China. 



Cap St. Jacques, at the mouth of the Saigon river. 



Preliminary diagnoses of Hydrophis lamherti, H. 

 siamensis, H. consobrinus and H. rostralis appeared in 

 the Journal of the Natural History Society of Siam, ii, p. 340 

 (1917) . Further study of these forms in the light of addi- 

 tional specimens obtained since that date, have obliged me to 

 modify considerably the remarks I made at that time. The 



