280 rROCKEDIXGS OF THE M.VL.VCOLOGIC.VL SOCIETY. 



keels, and more pai'ticularly in the str()n<;ly Urate character of its 

 base, which is further sculptured by laminar stritc. 



6. Spondylus EXfLis, n.sp. PL XVIII, Tig. 14. 



Testa ovalis, crassa, aspora, alba, prope umbones aurantia, rubro 

 tiiieta, costis irregularibus, squamis brevibus divcrsiformibiis munitis 

 instructis ; S(][uamis iutorstitialibus densis acutis irregularibus ; cardo 

 norinalis. Long. 80, alt. 70 mm. 



Hah. — Knrachi. 



A short-spined Spondylus of irregular growth. The orange and 

 pink colouring near the umbo reminds one of the West Indian 

 S. Americanus. 



7. Meketrix (Cakyatis) tumida, n.sp. PI. XVIIT, Figs. 12 and 13. 

 Testa parva, solida, cordata, tumida, albida vel f ulva, fusco fasciata, 



concentrice irregulariter rugoso striata; umbones acuti, valde in- 

 curvati, subspirales; margo dorsalis anticus brevis, Icviter incurvatus ; 

 posticus valde declivis, Icviter arcuatus ; lunula lata, vix impressa ; 

 ligamentum externum angustum, vix immersum. Cardo in valva 

 dextra dentibus tribus inrequalibus, dente sublaterali approximate vix 

 elevate munitus. Dentes cardinales vulva? sinistra) duo imequales ; 

 anticus obtuse trigonus ; posticus latus, fossa lata et profunda subti'i- 

 gona sectus ; lamina postica obli(iua subdentiformis. Pagina interna 

 sordidc albida: impressio pallii latesinuata. Long. 12, alt, 11, 

 crass. 8 •25 mm. 



Hah. — Mekran Coast. 



A little shell of robust growth, partaking almost of the form of an 

 Isocardia. It may be associated with the little group called by 

 Arthur Adams Callocardia, and erroneously placed in the family 

 Isocardiida3 (see my remarks in Proc. Zool. Soc. 1888, pp. 212, 213). 



EXPLANATION OF PLATE XVIII. 



Figs. 1, 2. Mangilia Towasendi. 



,, 3, 4. Biillia iiitida. 



,, 5, 6. Minolia gradata. 



,, 7-9. Gibbula (Euida) Townsendi. 



,, 10, 11. Niso venosa. 



,, 12, 13. Meretrix (Caryatis) tumida. 



,, 14. Spondylus exilis. . 



