462 Records of the Indian Museum. [\'ol. XXII, 



and need not be repeated here. I may note that the specimens in 

 the collection had no locality-labels in the beginning, but their pro- 

 venance was indicated by serial numbers, the details regarding 

 their localities were later supplied to me by Mr. den Doop and 

 these have been filled in the paper according to the list sent me. 

 All available details regarding habitat and distribution of the 

 various species have been included. Detailed synonymies are not 

 given except in special cases ; in others references to von Martens' 

 paper {Siiss- und Brackwasser-M ollusken des Indischen Archipelago 

 in Zool. Ergeb. Nieder. Osi-Indien IV, and to papers published 

 since that date only are necessary. 



Owing to the little information available it is not possible for 

 me to discuss in detail the geographical distribution and relation- 

 ships of the species represented in the collection but a close connec- 

 tion between most of the freshwater species of Sumatra and 

 continental Indian forms is quite apparent. This is particularly 

 well marked in the families Planorbidae, Melaniidae and Vivipaii- 

 dae. Indeed some of the forms from Sumatra are quite indistin- 

 guishable from the true Indian species. 



In the case of the estuarine forms also we find the same rela- 

 tionships, but this probably has much less value in this case than 

 for the freshwater forms, because a large proportion of the species 

 have an extremely wide range. 



The most useful summary of all that was known about the 

 distribution of the fresh and brackish-water species of Sumatra 

 was given by the late Prof. E. von Martens in the Zoological Re- 

 sults of Prof. Max Weber's collections in the Indo-Australian Archi- 

 pelago. For comparison I give below von Martens' list together with 

 a list of species described since his paper was published ; and also a 

 list of the species found in Mr. den Doop's collection. In addition 

 to the references given in von Martens' paper the following more 

 recent publications on Sumatran molluscs may be consulted. 



1898. Aldrich, T. H. " Notes on some land and freshwater 

 shells from Sumatra with descriptions of new species." 

 Nai(tilus, XII, pp. 1-4, pi. i. 



1899. Dautzenberg, P. " Contribution a La Faune Malacolo- 

 gique De Sumatra." .4mm. Sac. Roy. Malacol. Belgique, 

 XXXIV, pp. 1-26. 



1900. Martens, E. von. " Ueber Land und Susswasser Schne- 

 cken aus Sumatia." Nadir. Deutsch. Malakozool. Ges. 

 XXXII, pp. 3-14. 



1903. Martens, E. von. "Die beschalten Gastropoden der 



deutschen Tiefsee expedition." Valdivia Reports, VII, 



pp. 1-146. 

 1906. BuUen, R. "On some land and fresh-water molluscs 



from Sumatra." Proc. Malacol. Soc. VII, pp. 12-16 and 



126--130. 

 1908. Rolle, H. "Zur Fauna von West Sumatra." Nachr. 



Deutsch. Malakozool. Ges. XL, pp 63-69. 



