1H7L] MR. K. A. SMITH ON WEST-AFRICAN SHELLS. 737 



80. Cyclostrema tricarinata, sp. nov. (Plate LXXV. fig. 20". ) 



Testa parva, depressa, alba, late perspective umbilicata; anfract. 5, 

 rapide augentes, spiraliter lirati ; spira plana ; sutura depressa ; 

 anfract. ult. acute tricarinatus ; carina medium maxima ; aper- 

 tura subhexagonalis ; perist. curinis triangulatum, marginibus 

 callo tenui junctis. 



Alt. 1 mill., chain, maj. 3. 



[Tab. Whydah. 



A prettily lirated, depressed species, with the body-whorl tricari- 

 nate, the centre keel being the largest. 



81. Cyclostrema roseotincta, sp.nov. (Plate LXXV. fig. 27.) 



Testa parva, pallido-rosea, valide umbilicata ; anfract. 4, conve.vi, 

 spiraliter leviter lirati, incrementi lineis subtiliter decussuti ; 

 sutura depressa ; apertura fere circularis ; perist. continuum. 



Alt. ll mill., diam. maj. 1-J. 



Had. Whydah. 



This species has somewhat the appearance of a non-pearly Mar- 

 garita, and it is with doubt that I refer it to Cyclostrema. 



82. Ethalia lirata, sp. nov. (Plate LXXV. fig. 23.) 



Testa parva, alba, subimperforata ; anfract. 3.4, spiraliter tenue 

 lirati, infra suturam et circa regionem umbilicalem radiatim valde 

 plicati ; apertura circularis ; perist. continuum, crassum. 

 Alt. 2 mill., diam. maj. 3. 

 Hah. Whydah. 



A somewhat globular species, finely Urate spirally, and beneath 

 the suture and the umbilical callosity strongly plicate. 



83. Ethalia plicata, sp. nov. (Plate LXXV. fig. 24.) 



Testa parva, alba, kevis ; anfract. Zh, rapide augentes ; incrementi 

 lineis subtilissime striati ,• spira depressa ; sutura callosa, oblique 

 sulcata ; regio umbilicalis callositate plicata partim obtecta ; aper- 

 tura circularis ; perist. solidum, marginibus callo crassissitno 

 junctis. 



Alt. 1-} mill., diam. maj. 2j. 



Hah. AVhydah. 



A small, nearly smooth species, with a callous sulcate suture to the 

 whorls, and also a callosity nearly concealing the umbilicus ; in many 

 respects agreeing with the genus Leucorhynchia of Crosse. 



84. Teinostoma solida, sp. nov. (Plate LXXV. fig. 25.) 



1'esta solida, parva, pallido-fulva, Icevis ; anfract. 4, rapide augentes, 

 ultimus superne Icevis, basi planiusculus, spiraliter trisulcatus ; 

 regio umbilicalis callosa ,- apertura depresso-rotundata ; perist. 

 basi recede/is. 



Alt. 2 mill., diam. maj. 3^-. 



Hab. Whydah. 



A depressed species, plain above and trisulcate beneath. 



