92 DR. NELSON ANNANDALE ON THE 



Very few fish are found in this part of the lake, but I made a 

 large collection at Lanipani from the lowest reaches of the Pataluiig 

 River and from the creeks in its small delta. Most of the genera re- 

 presented are well known and widely distributed fresh-water genera 

 such as An ihas, O^fhromenus, Mastacemhehig, Pancliax, Barhus, liashora, 

 Mmiopterus, etc, and a large proportion of the species have already 

 been recorded from the Malay Peninsula ; but a few estuarine forms 

 such as Scaiophaijus ar<jus occur, and a certain proportion are new to 

 science. Of these the most interesting is a new species of Etroplus, 

 the only Oriental genus of the family Cichlidae. This family has not 

 hitherto been found east of the Bay of Bengal, but has a wide range 

 in tropical America and tropical Africa and has made its way north- 

 wards, through channels now completely blocked up, into the Jordan 

 system. Several species of Etroplus are found in Peninsular India and 

 Ceylon, but none have as yet been recorded from Burma or Siam 

 or any part of the Malay region. A species of Sting Ray, probably 

 Iliipholojihus sephen, occurs on the bottom of the inner lake. // sephen 

 makes its way far up the Ganges and other rivers l . 



Molluscs. With a few noteworthy exceptions, the molluscs 

 found in the inner lake are lacustrine forms. Tliose that live among 

 weeds near the edge belong to the genera Vivipara, Melania and Am- 

 2ndlaria, while inside the mouth of the J'atalung River, Limnaea, 

 Anajlus and Planorhis are also represented. These genera are abun- 

 dant in all eastern lakes or rivers, and the species found near Lampam 

 are divided pretty equally between Mal.ij'an and Indo-Chinese forms ; 

 but another form dredged both at Lampam in the river-mouth and out 

 in the lake seems to be unique among its family in living in fresh 

 water. It is a species of ManjineUa and, curiously enough, an allied 

 but distinct species replaces it in the outer lake. 



The bivalves taken on the bottom, both in the lake and in tlie 

 river-mouth, belong to the genera Corbkula of the Family Cyrenidae, 

 and Diinotus of the family Uniondae. At least three species of the 

 former occur ; all can be identified with forms already known from 

 the Malay I'eninsula or Indo-Chinese countries. Tlie single Unionid 



1. Sec Clinudluni, Juuin. Ai'iut. Hoc. Ben.jid (ii. s.). Vol. VI. p. 427 

 (1910). 



JOl'lJX. -NAT. II I.ST. J'OC. ."UM. 



