1891.] MR. E. A. SMITH ON SHELLS FROM ADEN. 409 



59. Purpura mancinella (Linn.), 



Hab. Philippines, Ceylon, Mer^ui, Araboina, Bay of Muscat. 

 P. echinata, Blainville, and P. cegrota. Reeve, united by Tryon 

 (Man. Conch, vol. ii. p. 164) with this species are certainly distinct. 



60. Purpura tissoti, Petit. 



Purpura tissoti. Petit, Journ. de Conch. 1852, p. 163, pi. vii. 

 ff. 4 a-h. 



Cantharus tissoti, Tryon, Man. Conch, iii. p. 164. 



Pisania tissoti, id. op. cit. vol. ii. p. 258. 



Hah. Bombay {Petit Sf Brit. Mus.). 



This species is a true Purpura, having the typical operculum of the 

 genus. It is most surprising that Tryou could see in it any relation- 

 ship to the genus Cantharus. 



61. Sistrum tuberculatum (Blainville). 



Hab. Red Sea, Indian Ocean, Mozambique, Japan, N.E. Aus- 

 tralia, Solomon Islands, &c. {Brit. Mus.). 



Other localities in the Indian and Pacific Oceans have been re- 

 corded (vide Smith, Voy 'Alert,' p. 52). 



62. Sistrum undatum (Chemnitz). 



Hab. Andaman Islands, Tranquebar, Singapore, West & N.W. 

 Australia, Louisiade Archipelago, China, Japan, New Caledonia, &c. 



63. Sistrum fiscellum (Chemnitz). 



Hab. Red Sea, Philippines. Natal and Polynesia (Cooke). 



64. Sistrum chrysostoma (Deshayes). 



Bicinula chrysostoma, Deshayes, Mag. de Zool. 1844, pi. 86. 



Ricinula chrysostoma (part.), Tryon, Man. Conch, vol. ii. p. 191, 

 pi. 59. f. 283. 



Hab. Red Sea (Deshayes). Indian Ocean, Philippines, Polynesia 

 (CooJce). 



The Aden shells agree precisely with the Red Sea forms as 

 described by Deshayes. 



65. Sistrum elatum (Blainville). 



Purpura elata, Blainville, Nouv. Ann. Mus. 1832, p. 207, pi. 11. 

 f. 1. 



Ricinula elata. Reeve, Con. Icon. fig. 27 (is a small variety). 



Ricinula spectrum, Reeve, 1. c. fig. 19. 



Hab. '^ew HoWdiWdi (Blainville). Philippines (jKeewe). Red Sea 

 (Brit. Mus.). 



The aperture of this species is described as white by Blainville 

 and Reeve. In several specimens in the Museum it is pale or deep 

 yellow. 



