12 MR. H. ADAMS ON SHELLS FROM MAURITIUS. [Jan. 9, 



River at Pointe a Larree, on the east coast ; rivers and fresh waters 

 of the Cape of Good Hope. 



16. Gerres lineolattjs, Giiuth. 



17. Chromis NiLOTicuSj Hasselq. 



18. Arius falcarius, Richards. 



19. Ltjtodeira chanos, Forsk. 



20. Elops machnata, Forsk. 



21. Elops cyprinoides, Gm. 



22. Anguilla JOHANNiE, Giinth. 



4. Further Descriptions of New Species of Shells collected at 

 Mauritius by Geoffrey Nevill, Esq. By Henry Adams, 

 F.L.S. 



(Plate IV.) 



Stomatia variegata, H. Ad. (PI. IV. fig. 1.) 



S. testa suhrimata, ovato- oblong a, convexa, transversim costata, 

 costis suhdistantibus, interstitiis longitudinaliter striatis, rubra, 

 albo varieyata ; spira prominula, apice acuta, sutura distincta; 

 anfr. 3^, co7ivexis ; apertura ovali, labia calloso, labro supra 

 ultimum anfractuum paulum ascendente. 



Long. 9, lat. 7 mill. 



Hab. Mauritius. 



Discus vorticella, H. Ad. (PI. IV. figs. 2, 2a,) 



D. testa aperte umbilicata, subdiscoidea, tenui, oblique confertis- 

 sime costulato-striata, fulva ; spira vix elevata, sutura di- 

 stincta ; anfr. 4|, convexis, ultimo antice nan descendente, 

 superne subdejjresso ; umhilico perspective, ^ diametri fere 

 cequante ; apertura obliqua, rotundato-lunari ; perist. simplici, 

 recto, maryinibus conniventibus, columellari vix dilatato, dextro 

 subsinuato. 



Diam. ixiaj. 2\, miu. 2, alt. | mill. 



Hab. Bamboo, Mauritius. 



Nanina (Rotula) cernica, H. Ad. (PI. IV. fig. 3.) 



N. testa imperforata, trochiformi-depressa, tenuissima, membra- 

 nacea, oblique lanyitudinaliter striata, lineis spiralibus minutis 

 decussata, corneo-lutescente ; spira depresso-conica, apice ob- 

 tusido, sutura leviter ijnpressa ; anfr. 4, planatia, ultimo de- 

 scendente, acute carinato, basi convexo ; apertura diagonali. 



