414 MR. E. A. SMITH ON SHELLS FROM ADEN. [June 16, 



monographs of this genus. The series from Aden includes small 

 specimens, such as figured hy Philippi, and others as large as that 

 figured by Reeve in the * Conchologia Iconica' (fig. 63). The 

 minute dotting varies in depth of colour and size, but all examples 

 exhibit the characteristic brown mark below the umbilicus. 



105. Natica t^niata, Menke. 



Hab. PhiHppines, Japan, China, Java ; Assab {Onramagna). 



The operculum of this species has only recently been described^. 

 It is strong and shell)', spirally grooved and ridged, the central portion 

 being more elevated than the rest of the surface, and the inner edge, 

 or that which applies to the columella of the shell, is not straight 

 but excurved at the middle, 



106. Natica rufa, var. 



Hab. Type from Mauritius ,: Madagascar, Singapore ; Borneo 

 (JBrit. Mus.). 



The Aden specimens belong to the variety (N.forskalii, Chemnitz) 

 which has been quoted from Mauritius {Try on) and the Red Sea 

 {[ssel). 



107. Natica maroccana (Chemnitz). 



Hab. "W. Indies, W. and E. Africa, Red Sea, Indian Ocean, West 

 coast of America, &c. 



108. Natica (Neverita) didyma (Bolten*), 



Hab. Indian Ocean, N. Australia to Japan, E. Australia. Aden 

 {Caramagna as N. chemnitzi). 



109. Natica (Mamilla) melanostoma, Lamarck, 



Hab. Red Sea, Indian Ocean, some parts of the Pacific. Aden 

 ( Caramagna). 



110. Natica (Polinices) mamilla (Linn,), 

 Hab. Same as N. melanostoma ; Aden {Caramagna). 



111. Natica (Naticina) papilla (Gmelin). 

 Hab. Red Sea, Indian Ocean, Moluccas. 



112. SiGARETUs planulattjs, Recluz. 

 Hab. E. Africa, Indian Ocean. 



113. Ianthina TROCHOiDEA, Reeve. 



The specimens from Aden correspond exactly in form with Reeve's 

 figure. 



114. R-ECHJZiA rollandiana, Petit, 



The two specimens from Aden, and one in the Museum from 



1 P. Z. S. 1890, p. 270, pi. xxi. f. 15. 



* Vide Watson, ' Report Challenger Gasteropoda,' p. 450. 



