470 Records oj the Indian Museum. [Vol. XXII^ 



var. intumusccns, v. Martens. 



1881. Limnaea Javanica var. inttimmcens, v. Martens, Condi. Mittli. 



I, p. 88. pi. xvi, figs. 2-4. 

 1S97. Limnaea javanrca var. intitmiiscens. v. Martens, op. cit., p. 3, 



pl. i> fig. 5- 

 1898. Limnaea javanica var. intnmmrens. Sarasin, P. and F., Sussw, 



Moll. Celebes, p. 8g. 

 iqoo. Limnaea javanica \'ar. infiimuscens, v. Martens, i\'aclir. Mala- 



kozool. Ces. XXXII, p. in. 

 1912-13. Limnaea javanica \ar. iiitnnuiscens, Schepniann. op. cif., pp. 



^35. 256. 



This variety is one of the lake-forms of this species and shows 

 the characters of the lake-forms. 



Specimens closely agreeing with a specimen identified by the 

 later Dr. E. von Martens and with his pubhshed figures are repre- 

 sented in the collection from freshwater areas at Mariendal (Deli), 

 Poengei (Langkat), the Soengei Bohorok and Anak Laut (a fresh- 

 water lake in the isle of Sabang). Some young specimens from 

 pools in the Lau Kling Valley and the Lau Goemba Valley (Karo- 

 Batak High Plain) near Brastagei also seem to belong to this form. 

 There are a few examples with the locality label '' Mangrove, Bela- 

 wan (Deli)." Probably they had been carried into this area with 

 the fresh-water flowing into it, if the labels have not got mixed.' 



This form is already recorded from Java, Sumatra and Celebes. 



var subteres, v. Martens. 



1S81. Limnaea javanica var. subteres, v. Martens, op. cif., p. 88, pl. 



xvi, figs. 6. 7. 

 1897. Limnaea javanica var. subteres, v. Martens, op. cit.. p. 4. 



This form appears from the shell-characters to be a stream- 

 phase of L. javanica. It is represented in the collection by many 

 specimens from the Valley of the Lau Kling (Karo Batak High 

 Plain) and Soengei Landak (Upper Langkat). All the specimens, 

 though rather small, are fully typical. 



This form is also known from the Celebes. 



var. angustior, v. Martens. 



1881. Limnaea Javanica var. angiistiur, v. Martens, op. cif.. pp.88, 89. 

 pi. xvi, fig. 9. 



1897. Limnaea javanica \ar. angusfior, v. Martens, op. cif.. pp. 4, 5, 



pl. I, fig. 7. 



1898. Limnaea javanica vai;. angusfior, Sarasin, h.and P., op. at., 



p. 89. " 

 IQOO. Limnaea javanica var. angitsftor, v. Martens, op. cif., p. 10. 



L. javanica var. angustior appears to be a true stream-phase 

 of the species in spite of the fact that v. Martens has recorded 



I At man)- places the mangrove-swamps (mangrove-bosschen) pass gradually 

 into fresh-water swamps (moreas-bosschen). At some places these two areas 

 are only separated by a pematang. A sharp limit in plant growth does not exist. 

 The shells mentioned arc from such regions, [den Doop]. 



