688 JOURNAL, BOMBAY NATURAL MIST. SOCIETY, Vol. XXI. 



Sydney Harbour, and was supposed by Tenison-Woods to be tbe same 

 species as E. australis, Lamk. As Lamarck never described an E. austra- 

 lis, possibly the species characterized under that name by Quoy & Gai- 

 mard was referred to. 



I have not seen any specimens from Bombay, so cannot confirm the 

 identification by Mr. Abercrombie. The species, however, should be 

 placed in the genus Subemarginula. It has never been figured, and with- 

 out examining the type it is almost impossible to know its true relationship. 



No. 5. Patella aster, Reeve, appears to be the only species of the genue 

 hitherto met with at Bombay. It is variable in colour ; tbe white rays, 

 which are inconstant in number (although nine are often observable) are 

 hardly visible externally in some specimens. In the type the nine rays 

 are very striking, as the shell figured by Reeve has been much cleaned. 

 In one example collected by Major Peile the dark rays are so broken up 

 that the markings hardly look like radiations. 



Pilsbry (Man. Conch., vol. xiii, p. 147) unites this species with the 

 Patella novemradiata of Quoy & Gaimard, described from the Mauritius, 

 but as I do not feel convinced of the certainty of the identification I 

 prefer to name the Bombay shells P. aster, about which there is no doubt, 

 since a comparison of the series of specimens collected by Major Peile 

 proves their identity beyond question, it seems to me more likely that 

 the Mauritian novemradiata may be a form of one of the African species, 

 e.g., rota, Gmelin, or capensis, Gmelin. The animal of P. astet' has not 

 hitherto been studied, but an examination of the radula shows that this 

 species belongs to the genus Helcioniscus, in which it is located by Pilsbry. 

 ACM^A BOMBATANA, n. sp. Figs. A-C. 



Testa ovato-rotundata, mediocriter elata, vertice paulo antemediani, 

 fusco et albo radiata, interdum minute fusco reticulata, radiatim tenuiter 

 striata, striis incrementi tenuissimis sculpta ; radii albi, ssepe in paribus 



