500 Records of the Indian Museum. [Vol. XXII^ 



Subgenus Neritaea, Roth (=Scrratae, Recluz). 

 Neritina ziczac, Lam. 



1897. Neritina ziczac, v. Martens, op, cif., p. 79. 



1899. Neritina ziczac, Dautzenberg, Ann. Soc. Malacol. Belgiqtie. 

 XXXIV. p. 19, pi. i, figs. 7. -ja. 



I refer to this species two specimens of a characteristic colour. 

 The colouration of these specimens resembles fig. 29, pi. vii in 

 Reeve's Conch. Iconica. The spire of one of the specimens is very 

 much eroded. 



The two specimens were collected from the mouth of the 

 Soengei Batang Kwis (Serdang), in the mangrove-swamp region. 



Neritina variegata, Lesson. 



1897. Neritina variegata. v. M,-irtens, op. cit., pp. 78, 79, pi. x, tig. 14. 



Nine specimens collected from a streamlet along the road to 

 Anak Laut (Sabang) closely agree with Lesson's description and 

 with a specimen named by the late Prof. E. von Martens. The 

 colour-pattern is, however, .slightly variable. 



Subgenus Neritodryas, v. Martens. 

 Neritina cornea (Linn.). 



ib^79. Neritina cornea, v. Marlens. op. cit.. p|i. 140-142. pi. xii, figs. 



14-18. 

 iSgg. Neritina (Neritodryas) cornea. D.iutzenberg. op. cit., pp. 21, 22, 



pi. i, figs. II, 1 1(2 and li. 



This species is widely' distributed in the Dutch East Indies, 

 and is represented in the Sumatran collection by a large number 

 of variously coloured specimens collected along with those of 

 N. variegata from a streamlet along the road to Anak Laut 

 (.Sabang) at various times. 



Subgenus Clithon, Recluz. 

 Neritina brevispina, Lam. 



1879. Neritina brevispina, v. Martens, op, cit.. p. 2S. 



A very large series of this species was collected by Mr. den 

 Doop at different times in the streamlet along the road to Anak 

 Laut (Sabang). The specimens are variously coloured, and either 

 have well-developed spines or are nearly smooth, there being only 

 rugosities in the regions of the spines. 



Neritina squarrosa (Recluz). 



1897. Neritina squarrosa, v. M.irtens, op. cit., p. So. 



The specimens of this species are also from the streamlet 

 along the road to Anak Laut (Sabang). The banding on the shell is 

 very like that figured on pi. xii in Reeve's Conch. Iconica. 



