170 VANIKORO. 



21. IMBRICATA, f. 11, Pease. — Parva obliqua angusta, 

 regulariter et teniiiter reticulata ; umbilico maximo, apertura 

 valde obliqua ; columella elongata. — The aperture is more 

 oblique than in any other species. 



22. Recluziana, f. 2. — Elevata angusta, regulariter cancel- 

 lata ; spira acuminata ; apertura brevi pyriformi, umbilico 

 mediocri. — One of the most pyramidal species with the 

 shortest proportionate aperture. 



23. ELATA, f. 6, Soiverby. — Ovato-acuminata, leviter can- 

 cellata ; spira elevata ; umbilico parvo ; apertura pyriformi. — 

 More ovate and more lightly cancellated than the preceding; 

 umbilicus small. 



24. SEM!SOLUTA, f. 16, Sowevhy. — Parva ovata elevata; 

 spira acuminata ; ultimo anfractu laxe adhserenti ; apertura 

 angustissima, elongata; umbilico angustissimo. — A very 

 narrow rather coarsely cancellated minute shell with very 

 elevated spire. 



Genus NERITOPSIS, Grateloupe. 



Plate 482. 



Testa subglobosa spiraliter granoso-costata ; spira brevi ; 

 apertura magna; labio interno crasso planulato medio quad- 

 ratira emarginato ; labio externo intus incrassato. Operculum 

 crassum,testaceum, nonspirali,ad columellam quasi-articulato. 

 — Subglobose, spirally granularly ribbed ; spire short, aperture 

 large ; inner lip thickened, flattened, and with a square notch 

 in the middle. Outer lip thickened and striated within. 

 Operculum thick shelly, not spiral, with curious articulation 

 on the columellar side. 



Syn. Radula, G-ray, not Klein. 



Species. 



Nekitina radula (Nerita), Linnccus. Hab. Ceylon. Only 

 one species known. 



(Shell and operculum, bottom figures in plate 482.) 



