25:8 SMITH : ON THE GENUS SCUTUS. 



Parmophorus ausiralis Quoy and Gaim., l.c., iii., p. 321, 

 pi. 69, f. 1—4. 



Sctitus elongatits A. Ad. in Sow. Thes., iii., pi. 249, f. 10. 

 Sow. Con. Icon., xvii.,pl. i, f. id. 



S. unguis Sow. (non L.) Con. Icon, f., 5b (? 5a). 



Habitat — Western Harbour (Quoy & Gaim.) Port Jackson, 

 Sydney (Angas & Brit. Mus.) 



Var. King George's Sound (Quoy & Gaim.) Freemantle and 

 Swan River (Brit. Mus.) 



The common form of this species appears to have been 

 recorded only from the east coast of Australia at Port Jackson 

 and Sydney, and from the southeast coast at Western Harbour, 

 which according to Quoy and Gaimard (Astrolabe, iii., p. 275), is 

 situated in Bass's Straits. 



The broad variety on the contrary as far as at present known 

 is restricted to localities on the west and southwest coasts, King 

 George's Sound being in the latter region and Freemantle and 

 Swan River in the former. With the exception of the greater 

 width of the shell there is apparently no distinction between the 

 two forms. MM. Quoy and Gaimard remark upon the convex 

 arched upper surface of their species {convexus), stating that it 

 rests upon the two extremities. This I conclude is not absolutely 

 correct, for even their figure represents the species as decidedly 

 elevated at the posterior end. This I may say is most unusual, 

 for as a rule it is the anterior extremity where the sinuation in the 

 margin exists which assumes an upward inclination. 



2. Scutus ambiguus Chemnitz. 



Patella ambigua Chemn. Conch. Cab., xi., pp. 178 and 181, 

 f. 1918. Wood, Index Test, pi. 38, i. 84. 



Scutus antipodes Montfort. Conch. Syst., ii., p. 58-9. 



J.Cii., Sept., 1870 



