THE NAUTILUS. 77 



Nassa pulla L. 



Nassa pulla L., var. minor, n. var. Plate IV, fig. 17. The 

 length of tliis shell is about the same as the aperture of the type. 

 All the examples obtained are of the same size. 



Vasum cornigerum Lam. 



Ricinula ricinus L. 



Rapana bulbosa SoUmder. 



CanceUaria melanostoma Sowb. 



Mitra castellans Lam. Apparently the first record of the species 

 in these waters. Shopland reports 50 species of Mitra as occurring 

 at Aden. With the addition of two species taken by Yerbury and 

 Baynham, and the present two species, the total number is brought 

 up to 54. 



Mitra crenulata Lam. 



Mitra deshayesii Reeve. This species may be said to inhabit the 

 triangle formed at the corners by Polynesia, Mauritius and the Red 

 Sea. It has not before been reported from the Gulf of Aden. 



Mitra plicata Lam. 



Latirus polygonus Gmelin. 



Harpa minor Humph. 



Harpa ventricosa Lam. 



Oliva andamanensis Bdg. Plate IV, fig. 7. The four examples 

 before me agree perfectly with those in the British Museum, which 

 were taken at the Audamen Islands. 



Oliva inflata Lam. From the number of individuals taken, this 

 must be an abundant form. 



Ancillaria acuminata Sowb. 



Ancillaria albisulcata Sowb. A characteristic feature, of this 

 species is the long white columella. 



Ancillaria castanea Sowb. I am inclined to believe that this 

 species will prove to be a variety of A.fulva. The color is the only 

 distinction. 



Ancillaria fidva Swains. The columella of this species is con- 

 siderably thickened at the base. 



Maryinella obscura Reeve. Plate IV, lia. 1C. The locality of 

 this species was for many years unknown. In 1891 Mr. E. A. 

 Smith discovered the species among the Yerbury and Baynham 

 Collections and included it in his list (P. Z. S. L.). When in 

 London I examined these shells and also the type. The Blair shells 

 are slightly larger, but otherwise similar to the type. 



