192 



Notes on the Marine Shells of Western Australia, 



with Descriptions of New Species. 



Part ii. 



By Jos. C. Verco, M.D. (Lond.), F.R.C.S. (Eng.). 



[Read October 10, 1912.] 



Plates XV. and XVI. 



This paper is the second in the series, continued from 

 p. 219 of vol. xxxv., 1911, and deals with the genera Hel- 

 cioniscus, Patella, Nacella, Acmcea, Phenacolepas, Haliotis, 

 and Schismope. 



It embraces also a list of shells received from Geraldton. 



lielcioniscus illibratus, Verco. 



Helcioniscus illibratus, Verco, Trans. Roy. Soc, S.A., 1906, 

 vol. xxx., p. 205, pi. x., figs. 6-14; Hedley, Commonwealth of Aus- 

 tralia, Fisheries, 1911, part 1, p. 93. 



King George Sound beach, 3 ; Ellensbrook, 9 ; Yallingup, 

 4 (from these two localities the specimens have a more decided 

 bluish-purple tint) ; Bunbury beach, 2 ; in 15 fathoms, 2 ; 

 in 22 fathoms, 1 (about half as large again as the type) ; 

 Rottnest Island, 1. 



Patella neglecta, Gray. 



Patella neglecta, Gray, Capt. King's Survey of the Inter- 

 tropical and Western Coasts of Australia, ii., Appendix, p. 492, 

 1827. 



P. (Scutellastra) neglecta, Gray, Pilsbry, Man. Conch., 1891, 

 vol. xiii., pp. 95, 96, pi. xx., figs. 41, 42, pi. lviii., figs. 40, 41. 



P. rustica, Linn, Menke, Moll. Nov. Holl., p. 33, 1843, and 

 Zeitschr. F. Malac, 1844, p. 62. 



Patella melanogramma, ( ? ) Gmelin, Sowerby, Genera of Shells, 

 vol. i., p. 140. 



Patella zebra, Reeve, Conch. Icon., 1854, pi. iv., figs. la, 7b, 

 "Swan River." 



Locality. — Esperance beach, few; Hopetoun, few; 

 King George Sound, Rabbit Island, many, and up to full 

 size between water-marks ; Ellensbrook and Yallingup, many ; 

 Rottnest Island, 1. 



This species does not appear to come much further east 

 than Esperance. It was not found on St. Francis Island, 

 nor has it been taken along the coast of South Australia. 



On Rabbit Island it attains the length of 100 mm. 

 Nearly every individual exceeding 25 mm. in length carries 



