280 



PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Long. 65, alt. 36 mm. 



Hab. — Ascension Island. 



In form this species closely resembles the much smaller Mediterranean 

 T. nitida, Poli. The greater part of the surface is almost smooth, 

 exhibiting a few obscure growth-lines, and veiy faint radiating striae. 

 The posterior side is roughly plicately ridged, and the anterior 

 concentrically grooved, while near the margin, on the anterior side, 

 numerous fine oblique striae are observable. 



Tellina (Tellinella) prismatica. Fig. 3. 



Testa oblongo - ovata, sequivalvis, ina^quilateralis, compressa, 

 tenuissima, alba, iridescens, concentrice confertim tenuissime striata, 

 postice obscure angulata, leviter truncata, antice rotundata. Margo 

 dorsalis anticus leviter arcuatus, posticus abbreviatus. 



Long. 21, alt. 14 mm. 



Sah. — Sierra Leone. 



( 



This little white shell, which shows beautiful prismatic colours in 

 the light, is in form and substance somewhat like the European 

 T. tenuis, Da Costa, but the ventral margin is rather straighter, and 

 the posterior side more truncated. 



Venus (Chione) Keppeliana. Fig. 4. 



Testa sub-ovata, solida, leviter inflata, fusca, maculis albidis con- 

 spersa, lamcllis concentricis, numerosis, tenuissimis, fimbriatis, utrinque 

 magis elevatis, instructa, radiatim confertissime lirata ; liris mediauis 



