464 Mr. W. H. Benson's Conchological J^otices. 



at the centre of the extremity, the lobes rounded. Mantle free, and 

 branchial cavity open. Foot with a spiral horny operculum angular at 

 the upper part. 



The specimens varied infinitely in colour, and were for the most part 

 banded with red, white, and glaucous. 



I met with a few specimens on the Ghauts at Calcutta, sixteen miles 

 lower down the river. 



I preserved specimens alive in a glass replenished occasionally with 

 fresh or sea water, until April, 1833, when we had passed St. Helena. 

 The strong ones crawled out of the water, and adhered to the glass above 

 the margin of the liquid. 



Genus Novaculina, Bens. 



I was much pleased during a recent visit to Dublin, at meeting with 

 a second species of the genus Movacidina, founded by me in the Glean- 

 ings in Science of Calcutta, (No. 14, for February, 1830,) on a single 

 species Mov. Gangetica, met with in the several rivers of the Gangetic 

 tract, and especially interesting as a Solenaceons genus inhabiting fresh 

 water. The species in question I procured from Mr. Glennon of Suffolk 

 Street, who informed me that it had been recently brought from Indiana, 

 U. S. In its generic character it agrees with the Asiatic shell to which 

 it is superior in size. It differs specifically in the following instances. 



The posterior or syphonal and ligamental side is the shorter, and the 

 teeth are situated on the longer side of the shell; while in the Asiatic 

 species the syphonal and ligamental side is the longer, and the teeth are 

 on the shorter side. The callus which borders the ligamental canal is 

 also much thicker, comparatively, in the American species, having to 

 support a very strong ligament. My specimen has two teeth in each 

 valve, and the syphonal scar is equally long with that of JVbv. Gangetica. 

 The remains of the epidermis on the edge of the shell shew that, in this 

 species also, it projects beyond the basal and cardinal edges. 



Genus Scaphula, Bens, 

 My first specimens were found in the rainy reason of 1826 in the bed 



