1875.] G. & H. Nevill — Descriptions of new Marine Mollusca. 93 



In sand from Annesley Bay in Abyssinia, I have named this prettily 

 coloured little shell after Mr. W. T. Blanford, to whom the Indian Museum 

 is indebted for it, as well as for very many other interesting species from the 

 same locality. 



Clathttbella Aemstbongi, n. sp., PL VII, Fig. 13. 



Shell pyramidically elongate, angular in the middle of the whorls, very 

 pointed at base, suture distinct, apex very sharp and pointed ; colour 

 uniform chocolate-brown ; whorls eight, the first two perfectly smooth, the 

 3rd and 4th with two transverse keels in the centre, the last four obtusely 

 and distantly longitudinally ribbed, transversely regularly striated ; colu- 

 mella much contorted or twisted, with a shining callosity which is pro- 

 minently rugosely granulated as in the genus Cythara ; aperture short and 

 much contorted, with a large, prominent, tooth -like tubercle at the junc- 

 tion of the outer lip with the columella and with a remarkably wide, deeply 

 excavated sinus ; outer lip thickened, transversely striated, peculiarly and 

 minutely, very closely granulated just within the aperture ; in three of the 

 four specimens the columella and margin of the outer lip are stained a 

 brighter brown than the rest of the shell. The above characters will serve 

 easily to distinguish this shell from PI. arctata of Reeve, the only species 

 which, as far as we know, it at all resembles. 



Long. 5, diam. 2J mil. 



The type was dredged by Mr. Wood-Mason at the Andamans in 

 25 fths. Dr. Armstrong of the Indian Coast Survey has also presented to 

 the Indian Museum three specimens, which he dredged at about the same 

 depth in the Paumben Straits, in these latter the columella and outer lip are 

 stained a bright brown, but there is no other difference from the type form. 



CXTHABA GEADATA, n. Sp., PI. VII, Fig. 15. 



Shell compressedly, ovately oblong ; sutures excavated, apex very obtuse, 

 having a decollated appearance, pure white throughout ; whorls six, longi- 

 tudinally ribbed, ribs continued to the extreme base of the last whorl, trans- 

 versely very regularly striated, columella almost straight, slightly rugose at 

 its upper part ; aperture narrowly contracted, especially towards its base, 

 sinus small ; outer lip very thick, regularly rounded, granulated just within 

 the aperture. 



Long. 5f, diam. 2 mil. 



Not uncommon in sand from Balapiti in Ceylon (nobis) and Bombay 

 (Rev. S. B. Fairbank). 



(Coll. Indian Museum and H. Nevill.) 



Ctthaea dubiosa, n. sp., PL VII, Fig. 18. 

 We have felt considerable doubt whether the present species is really 

 distinct from the shell described by Reeve as Mangelia coniformis, Gray 



