186 Proceedings of the Royal Society of Victoria. 



discernable on the columellar side of many shells that have not 

 fully attained adult growth. In C. angustata the lines are all 

 discontinued, and the shell generally becomes of a uniform 

 brown, varying, however, in tint. The spots on the dorsum are, 

 we think, the last formed, as we have seen no trace of them in 

 the very young shells, and we infer that probably the young of 

 the varieties declivis and albata, prior to the in-turning of the 

 outer lip are identical. 



We consider from the descriptions and figures of C. angustata 

 varieties mayi, and subcarnea, Beddome, that the former is var. 

 comptoni, and the latter a somewhat rare form of the type C. 

 angustata. 



We think it probable that a large representative collection of 

 West Australian specimens of this species will lead to the 

 inclusion of C. pulicaria, Reeve, as being another variety of C. 

 angustata. 



All the adult shells, with the exception of var. albata, have the 

 round dark spots on the margin, and encircling the shell at the 

 base, these spots vary greatly in size on different specimens, and 

 are occasionally absent at the ends, at other times they are very 

 numerous at the ends and become confluent. 



To assist in following our definitions we give the following 

 synopsis : — 



Synopsis. 



Dorsum brown, no bands, no spots, — C. angustata. 



Dorsum light brown or cream, no bands, but numerous spots, — 

 var. declivis. 



Dorsum light brown or cream, with bands and numerous spots, 

 — var. piperita. 



Dorsum light brown or cream, with continuous bands, but no 

 spots, — var. comptoni. 



Dorsum cream or light brown, with interrupted bands, but no 

 spots, — var. bi color. 



Without bands or spots of any kind,— var. albata. 



Note. — In the references we have only cited the original, in 

 each case, and a second reference which gives a figure, when one 

 was not given with the original description. C. angustata was 

 re-named C. maculata by Perry in 1811, but we do not know of 

 any instance where this synonym has been used in Australia. 



