Mollusca from the Island of Rodriynez. 405 



grauosis ornati ; apertura ovata, superne acuminata ; columella 



arcuata, alba. 

 Long. 16 mill., diam. 5 ; apertura long. 5, diam. 2^. 

 Var. major long. 23 mill., diam. 7. 



(Coll. by Gulliver.) 



This species has a close resemblance to certain varieties of 

 M. fasciolata of Oliver, which inhabit Egypt. 



Vaginula rodericensis^ sp. n. 



Corpus elongatum, utrinque rotundatura, postice leviter angustatum 

 et acuminatum, supemerotundatum.lateraliter carinatum; pallium 

 supra et infra minutissime granulatum, tcstaceum, irregular! ter 

 confertim nigro tessellatum vel punctatum, infra pauIo pallidius, 

 marginibus lateralibus baud nigro-punctatis ; pes angustus lati- 

 tudinis eor]:)oris | adaequans, testaceus, usque ad extremitatem 

 corporis fere productus ; tentacula oculifera nigrescentia ; caput 

 tentaculaque buccalia flavo-testacea ; orificium femineum paulo 

 pone medium corporis situm. 



Long. 30 mill., diam. 10. (specim. in alcohol, serv.). 

 (Coll. by Gulliver.) 



The mantle is rather broader at the anterior extremity than 

 posteriorly, where it is more acutely rounded. 



Diplodonta lateralisy sp. n. 



Testa alba, transverse globoso-ovata, antice angustata, postice latis- 

 simc rotundata, valde inaiquilateralis ; margo dorsalis utrinque 

 paululum declivis et rectiusculus ; valvar tenuiter concentrice 

 striata;, bic illic fortius ; umbones hand prominentes, conspicuo 

 excentrici ; impressio muscularis antica elongata angustiuscula, 

 postica ali(]uanto latior. 



Long. 18 mill., latit. 20|, crass. 11. 



(Coll. by Slater.) 



D. coreensis of Adams and Reeve approaches the present 

 species somewhat in forai ; but the umbones are not so lateral 

 and the anterior end is broader. Within the valves, parallel 

 with the pallial impression on the side towards the umbones, 

 there is a second impression, which is punctured with small 

 pits ] but probably this is only an individual peculiarity. 



Avicula fusco-purpureaj sp. n. 



Testa inaequivalvis, perobliqua, postice pcrobUque alata, striis con- 

 centricis confertis regulariter sculpta ; color externus fusco-pur- 

 pureus, antice interdum pallescens ; rostrum valvar dextrse medio- 

 criter breve, paululum declive, confertim rugoKo lamellosum. 

 valva sinistrae angustura, magnum ; cauda incnnspicua ; a la per- 



