SOUTH AFRICAN ^[ARINK MOLr-US<'A. 209 



Apparently the absence of a perforation is not a matter of 

 vital importance, for otherwise the shell is quite normal. A 

 similar absence of perforations in the genus Haliotis was 

 noticed by me in 'Tiie Conchologist,' vol. ii, p. 75. 



E m a r g i n u 1 a m i c a n s ^4 . Ada ms. 



Emarginula micans J,. Ad. ' Proc. Zool. Soc./ 1851, p. 

 84; Sowerby, 'Thesaurus/ vol. iii, PI. CCXhYl,i\g. 60, as E. 

 elongata; Pilsbry, 'Man. Conch.,' vol. xii, p. 257, PI. 

 LXIV, fig. 15, after Sowerby. 



Hab.^ — Tongaat, Natal (H. Burnup) ; Pains Island, North 

 Australia (A. Ad.). 



The Natal specimen of this species is considerably larger 

 than the type, which probably is not a full-grown shell. It 

 was desci'ibed by Adams as " pallida fusca," Inxt one of the 

 shells preserved with the type in the Cuming collection is 

 entirely white, so also is the specimen from Natal. In the 

 type there are about fifty radiating riblets, and in the South 

 African shell about sixty-eight. This increased number is 

 OAving to its being a larger shell and the occurrence of small 

 intercalating riblets. The type has al)0ut fifteen concentric 

 lirie (nodulous on the riblets) besides a few fine indistinct 

 ones near the apex. In the Tongaat specimen, which is twice 

 as large, there are about thirty. The fissure in the type is 

 2*5 mm. in length. This is the first record of the genus 

 l*]marginula from South Africa. 



Patella patriarch a Pils'Jynj. 



Hab. — Kalk Bay, Cape of Good Hope. 



This is the largest of the South African limpets. There 

 are specimens in the British Museum 5j\ in. in length. It is 

 the P.rustica Ret^ve (not of Linn.) and of Sowerby's 

 'Marine Shells of S. Africa,' p. 49. The true rustica of 

 Linna3us, as demonsti\atcd by Hanley and others, is a Mediter- 

 ranean species. It is not very easy to distinguish the present 

 form from P. barbara, and Sowerby observes, 1. c, " I doubt 

 very much wh(^ther this (plicata, which is a synonym of 



