50 ON THE NAIADES, 



genus. It is remarkable for its size and weight, and the strong and 

 wide callus on the columella. Under the epidermis it varies from a 

 dark orange to lemon yellow. A depauperated specimen in my pos- 

 session would scarcely be recognized as the same species, owing to the 

 density of the orange colour. The apex of the perfect shell, having 

 but a thin epidermis, presents an orange appearance, — this colour may 

 also be observed on the inside of the shell. At the base of the colum- 

 ella there is an obsolete tubercle. The band sometimes consists of a 

 single white line only. It is believed these specimens formed part of 

 the collection brought from Java bv Mr Shillaber. 



Helicina virginea. Plate XIX. fig. 58. 



Testa subconicu, apicc acuta, subtiis inflatd, o-assd, transversim multisulcatd ; 

 anfractibus senis ; spira elevatd; apertiird valde dilatatd ; lahro ejfuso ; cohi- 

 melld subcallosu. 



Shell subconical, acutely pointed, inflated below, thick, with many transverse fur- 

 rows ; whorls six ; spire elevated ; aperture much dilated ; outer lip efi'use ; columella 

 thinly coated. 



Hab. Java.' 



Helidna striata ? Lam. 



My Cabinet. 



Diam. -8, Length -8 of an inch. 



Remarks. — This species came in the same collection as that de- 

 scribed last. It is nearly of the same diameter. It differs from it 

 altogether in form and colour. It is remarkable for its acutely pointed 

 apex, its milk-white appearance, and its numerous furrows. The 

 outer lip may, with propriety, be said to be effuse rather than re- 

 flected. 



