192 1.] B. Prashad : Sumatran Molluscs. 489 



Subgenus Stenomelania, Fischer. 

 Melanoides aspirans (Hinds). 



1874. Melania aspirans. Brot, op. cit., pp. 14.0, 142, pi. xvii, figs. 4a-(i. 

 1885. .Melania fuscat a var. aspirans, Nevill, op. cit., p. 222. 



Nevill considered this species to be only a variety of th^ 

 Nicobarese M. fuscata, but I think it to be distinct. In the Su- 

 matran collection there is a single specimen from a streamlet along 

 the road to Anak lyaut (Sabang), which resembles Fijian specimens 

 of this species in the Indian Museum collection. 



The specimen is fairly large, measuring 36-5 mm. by 11 mm., 

 and the aperture is I2'5 mm. by 67 mm. It has five persistent 

 whorls ; the apex is greatlj- eroded and at least 3 more whorls must 

 have been present in the complete specimen. The whorls increase 

 regularly in size and are only moderately swollen. The sculpture 

 consists of very faint vertical ridges irregularly disposed on the 

 various whorls ; on the uppermost whorl transverse ridges are also 

 to be seen a few such ridges are also present on the base of the 

 body-whorl. The suture is very oblique and moderately impressed. 

 The aperture is ovoidal, drawn out to an acute angle posteriori}'. 

 The shell is dark brownish. 



Melanoides plicaria (Born). 



1897. Melania plicaria, v. .Martens, op. cit., pp. 41, 42. 



This species has a wide range in the Malay Archipelago, but 

 had not hitherto been recorded from Sumatra. In Mr. den Doop's 

 collection there are three adult specimens, collected from a stream- 

 let along the road to Anak Laut (Sabang). Another specimen 

 collected at Sabang b}^ Mr. J. B. Corporaal also probably belongs 

 to the species. 



Melanoides acutissima (Busch). 



1874. Melania acutissima, Brot, op cit., p. 129, pi. xvi, figs. 2, 2a. 

 1885. Melania acutissima, Nevill, op. cit., pp. 226, 227. 

 1897. Melania acutissima, v. Martens, op. cit., pp. 42, 43. 



The specimens I assign to this species are from a streamlet 

 along the road to Anak Laut (Sabang). They are of all ages and 

 show the specific characters distinctly. 



M. acutissima was hitherto known from Java, Bali and Luzon. 



Melanoides turris (Brot). 



1874. Melania turris, Brot, op. cit., pp. 146, 147, pi. .\v;ii, figs. 5, 50. 



I assign to this species 3 adult and 3 medium-sized specimens 

 from a streamlet along the road to Anak Laut (Sabang). The 

 specimens were collected along with those of M. plicaria, M. acu- 

 tissima and M. monilc. They agree closely with Brot's descrip- 

 tion and figures of the species. 



Brot gives the locality of his specimens as doubtfully from 

 Borneo, and von Martens states that the species is found in the 

 Malaccas, Bali and Flores. 



