Mollusca from the Island of Rodriguez. 405 



granosis ornati; apertura ovata, superue 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. 



Vagimda rodericensis^ sp. n. 



Corpus elongatum, utrinque rotundatum, postice leviter angustatum 

 et acuminatum, supeme rotundatum, lateraliter carinatum; jjallium 

 supra et infra minutissime granulatum, testaceum, irregulariter 

 confertim nigro tessellatum vel punctatum, infra paulo pallidius, 

 marginibus lateralibus baud nigro-punctatis ; pes angustus lati- 

 tudinis corporis \ adsequans, 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 lateralis^ sp. n. 



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

 sime rotundata, valde inaequilateralis ; margo dorsalis utrinque 

 paululum declivis et rectiusculus ; valvae tenuiter concentrice 

 striatse, bic illic fortius ; umbones baud prominentes, conspicue 

 excentrici ; impressio muscularis antica elongata angustiuscula, 

 postica aliquanto latior. 



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



(Coll. by Slater.) 



D. coreensis of Adams and Reeve approaches the present 

 species somewhat in form ; but tlie 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-purpurea, sp. n. 

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

 centricis confertis regulariter sculpta ; color externus fusco-pur- 

 pureus, antice interdum pallescens ; rostrum valvae dextrse medio- 

 criter breve, paululum decHve, confertim rugose lameUosum, 

 valvae sinistrae angustum, magnum ; cauda inconspicua ; ala per- 



