194 H. B. Preston : Neiv species of S/icILs. [Vol. II, 



not reflexed; columella bearing three plaits, the first strong and 

 nacreous white. 



Altitude 



25 mm. 



Diam., major . . 



9 „ 



Aperture, alt. . . 



13 ,, 



,, diam. 



2-5 „ 



Habitat — Andaman Islands. 





Related to M . cruentata, Reeve, but is more cylindrical in 

 general outline, is much more finely sculptured and lacks the yellow 

 markings on the ribs ; the aperture is also more elongate than in 

 that species. 



Nassa gerstenbrandti, sp. nov. 



Shell ovately fusiform, yellowish white, narrowly banded at the 

 sutures ; periphery and base with reddish chestnut ; whorls 6^ ; 

 the apical whorl smooth, polished, the remainder finely, spirall}^ 

 striate and sculptured with somewhat distant, varicose ribs ; 

 sutures impressed ; aperture inversely auriform ; columella descend- 

 ing obliquely, extending into a callus which reaches the lip above ; 

 peristome varicosely thickened, finely denticulate within ; canal short. 



Altitude .. .. 4' 75 mm. 



Diam., major . . . . 2*25 ,, 



Aperture, alt. .. . . 1*5 ,, 



diam. . . '75 ,, 



Habitat — Andaman Islands, 7- -10 fathoms. 

 « 



Nassa jucunda, sp. nov. 



Shell fusiform, pale yellow, painted with an infra-sutural band 

 of rich chestnut and a paler peripheral band of reddish brown ; 

 whorls 5, rather flat, sculptured with closely set transverse costee 

 and fine spiral striee ; sutures impressed ; columella tridenticulate ; 

 aperture oval ; peristome thickened, denticulate within. 



Altitude 





. . 5 mm. 



Diam., major . . 

 Aperture, alt. . . 

 , , diam. 

 Habitat — Andaman 



Isl; 



•• 2-25 ,, 

 •• 1-5 ,, 

 • • '5 , ,, 

 ands, 7 — 10 fathoms. 



Easily distinguished from A^. gersienbrandU by the finer sculp- 

 ture, flatter whorls and more pronounced colouring. 



Nassa tristis, sp. nov. 



Shell fusiform, dull greyish olive with a pale infra-sutural 

 band ; whorls 8, transversely, coarsely ribbed and finelj^, spirally 

 Urate ; sutures impressed ; peristomie varicosely thickened, bearing 

 a row of denticles just within the aperture of which the posterior 

 one is the coarsest ; aperture ovate ; columella broadening into a 



