342 Memoirs of the Indian Museum. [Vol. V, 



mediate specimens in our collection and regards this name as a synonym. The 

 species is found in a living condition at all seasons of the year, but at the end of 

 the freshwater season dead shells are extremely abundant. T. estriata has also been 

 found in backwaters on the west coast of India. 



Family Bullidae. 



Bulla (Haminea) crocata, Pease, Proc. Zool. Soc. London, i860, p. 19. 



This species, which is common among weeds in the backwaters near Madras, 

 does not appear to have become thoroughly acclimatized in the Chilka Lake. Dead 

 shells, some of which contained remains of the soft parts, were found among drift 

 weed on the shore at Satpara in September, and a single small but apparently full- 

 grown living individual was taken in the same month in Seruanaddi. A dead and 

 much eroded shell was found on the shore of Barhampur I. in March. 



Our largest shell is about 14 mm. long, but the one from. Seruanaddi is less than 

 5 mm. long. We have discussed the significance of these facts on p. 337. 



The species was described from the Sandwich Is., where it was found " usualry 

 on sand -flats, but occasionally on seaweed." It was noted by Pease that shells were 

 much more abundant on the leeward than on the windward islands. 



Order PROSOBRANCHIATA. 



Family Nassidae. 



This family is represented by five species of the genus Nassa, all of which are 

 small, none exceeding 16 mm. in length. Only two of the species, N. orissaënsis and 

 N. denegabilis , are widely distributed in the main area, but N. labecula is not 

 uncommon on sandy ground at Nalbano. The other two were taken on a few 

 occasions in the outer channel. The shells were frequently inhabited by the hermit- 

 crabs Diogenes avarus and Coenobita cavipes. 



Nassa sistroidea, G. and H. Nevill, Jonm. Asiat. Soc. Bengal (2), XLIII, p. 24 

 pi. i, fig. 6 (1874). 



A few living specimens of this species were taken in the outer channel in March 

 and September. N. sistroidea, which was described from the Andamans, is probably 

 only an occasional visitor from the sea, though it is apparent^ able to survive the 

 freshwater season. 



Nassa labecula, A. Ads., Proc. Zool. Soc. London, 1851, p. 98. 



This species is common in the outer channel at all times of the year and was 

 found in abundance with Potamides fiuviatilis on the shore of Nalbano in March. It 

 is apparently an arenicolous form. 



Nassa marrattii, Smith, Jouvn. Linn. Soc, Zool., XII, p. 543, pi. xxx, fig. 4 



(1876). 

 A single shell was dredged, in a fresh condition, in the outer channel off Satpara 

 Point in September. The species, which has been recorded from the western Pacific, 



