1874.] MR. H. ADAMS ON NEW SPECIES OF SHELLS. 585 



the hinge and closed valves of the former with an external structure 

 strongly resembling that of the latter. I would add that the valves 

 of Scintilla, besides being furnished with hinge-teeth, are very 

 thin and highly polished ; and those of Galeomma, which are without 

 hinge-teeth, are thin, sculptured, and gape widely in the middle ; 

 the valves of S. incerta, on the contrary, which are provided with 

 hinge-teeth, are solid, not polished, and completely closed all round. 

 This anomalous shell may, I think, be considered the type of a 

 distinct genus, for which I propose the name Barclayia, after Sir 

 David Barclay, to- whose researches during his long residence at 

 Mauritius we are indebted for much of the knowledge we possess of 

 the interesting land Mollusca of that island. 



Apicalia holdsworthi, sp. nov. (Plate LXIX. figs. 1, 1 a.) 



A. testa ovato-subulata, tenui, polita, ciaereo-alba, versus apicem 

 pallide rufa"; spira acuminata, sutura distincta, fascia subpellucida 

 angusta marginata ; anfr. 10, apicalibus stylinis, cceteris convexi- 

 usculis, ultimo rotundato ; apertura subovali ; labio arcuato ; labro 

 valde sinuato, acuto. 



Long. 6, lat. 2| mill. 



Hub. Ceylon (Holdsworth). 



Tudicla spirilla, Lam. (Plate LXIX. fig. 2.) 

 Operculum corneum, acuminato-ovale, nucleo apicali. 



Barclayia, gen. nov. 

 Testa transverse ovata, subcequilateralis, tumida, solida, omnino 

 clausa, striis concentricis et striolis con/ertis radiantibus decus- 

 sata ; umbonibus subcentralibus vix prominentibus ; margine cre- 

 nulato. Cardo dentibus duobus contiguis tuber culceformibus in- 

 structus ; ligamentum internum ; linea pallialis simplex. 



Barclayia incerta, Desh. (Plate LXIX. fig. 3.) 

 Scintilla incerta, Desh. Cat. des Moll, de l'ile de la Reunion, 

 p. 18, pi. 2. figs. 16-18. 

 Long. 14, alt. 9, lat. 7 mill. 

 Hab. Bourbon (Reunion) (Deshages); Mauritius (Robillard). 



Neritopsis radtjla (Linn.). (Plate LXIX. figs. 4, 4 a, 4 b). 



Operc. testaceum, crassum, subtriangulari-ovatum, subvitreum, ex- 

 terne perconvexum, interne subconcavum ; margine exteriore cir- 

 culari; margine columellari uudulato, ad incisuram columellarem 

 testce accommodate- ; facie externa fastigiis nonnullis in plicas 

 rotundatas desinentibus e margine externa radiantibus instructa ; 

 facie interna cicatrice confer tim radiatim striata. 



Paludomus luteus, sp. nov. (Plate LXIX. figs. 5, 5 a.) 

 P. testa acuminato-ovali, solida, sub lente striis minutissimis, crebris, 

 transversis, et striis longitudinalibus decussata, alba infra epi- 

 dermide lutea ; spira elevata, subconica, apice acuto, sutura di- 

 stincta ; anfr. 8, convexiusculis, ultimo amplo, antice vix at- 

 Proc. Zool. Soc— 1874, No. XXXVIII. 38 



