1869.] Contributions to Indian Malacology. 127 



dionali, liaucl procul a promontorio meridionali Indies " Gape Comorin" 

 dicto. 



Shell very broadly umbillicated, depressed, discoidal, thin, glassy, 

 smooth and polished, with obsolete striation. Spire perfectly flat ; the 

 apex not rising above the surface ; suture impressed ; the nucleus is 

 generally wanting, being apparently remarkably liable to erosion. 

 Whorls 4 to 4J, slightly convex above, the last descending but slightly 

 near the mouth, and nearly square, with two keels, the one rather high 

 up, forming the periphery of the shell, the other at the outer side of the 

 base ; these keels can be traced upon the penultimate and part of the 

 ante-penultimate whorl, both on the spire and within the umbilicus, 

 forming a distinct rib inside the suture. Aperture oblique, nearly 

 square, with a white internal lip ; peristome thickened, all in one 

 plane and not expanded. Operculum convex and smooth inside, the 

 margins of the whorls externally much elongated and torn, especially 

 towards the margin. 



Major diameter, from the edge of the peristome to the opposite 

 margin 0.34 inch, minor diam., at right angles to the other, 0.28, 

 height 0.08. A smaller specimen measures 0.27 and 0.2 in the two 

 diameters and 0.5 in height. 



Although this shell resembles some Gyclophori in form, it differs 

 from all species hitherto known in several characters and certainly 

 forms the type of a distinct section. 



2.— Cyclophorus (Ditropis) Beddomei, n. sp. 



PI. XVI, fig. 2. 

 Testa latissime umbilicata, depressa, discoidea, tenuis, olivacea, con- 

 fertissime striata, parum nitida, spiraliter costata. Spira plana, sutura 

 valde itnpressa. Anfr. circa 4, (prima in exemplo unico deficienti) 

 convexi, primi fere glabri ; 'penultimus costis2 — 3, supra una, infra in 

 umbilico juxta suturam ornatus, ultimus antice descendens, teres, juxta 

 suturam et subter peripheriam glaber, 7 —costatus, costis 4 superioribus, 

 quaram extern ad periplieriam, 3 basalibus ab superis intervallo dis- 

 junctis. Umbilicus perspectivus. Apertura diagonalis, rotunda ; 

 peristoma simplex, rectum, breviter adnatum, nigrescens, intus tenuiter 

 albido-labiatum. Operculum fusco-corneum, intus convexum, limbo 

 tenuissimo circumdatum, extus concaviusculum, marginibus anfracluum 

 parum elevatis. 



