| OCR Text |
Show 49" MR. E. A. SMITH ON LAND-SHELLS [May 7, superne ad canalem suturalem carina lamelliformi munitus, lineis incrementi tenuibus leviter obliquis sculptus ; apertura oblique circularis, intus ceeruleo-alba; peristoma duplicatum, margine mteriori Icevi vix expanso, superne prope anfractum parum profunde sinuato, externo anguste expanso, superne ala parva leviter fomicata instructo. Operculum corneum, concentricum, multispirale, utrinque concavum, extus lamellis brevibus striatis obtectum. Diam. max. 31 mill., min. 22, alt. 15, apert. diam. intern. 9. Hab. Borneo (G. B. Sowerby). Shell discoidal, openly umbilicated, and clothed with a thin uniform yellowish-olivaceous epidermis. Beneath this it is of a dirty or bluish-white tint. The spire is only slightly raised above the last whorl. The whorls, about five in number, are convex and bordered by a deep and broadish channel at the suture, the outer margin of the canaliculation being produced into a thin lamellar ridge or keel; and outside this carina the whorls are a trifle depressed or excavated. Fig. 3. Cyclophorus {Myxostoma) bathyraphc. The sculpture consists merely of the lines of growth, which are fine and somewhat oblique. The aperture is slopingly circular, bluish white, and has a double lip. The inner edge is thicker than the outer, and scarcely at all everted. The sinus is distinct, moderately deep, and situated at the termination of the sutural canaliculation. The outer rim is somewhat expanded but not reflexed, narrowest on the left side where it touches the whorl, and thin and sharp at the extreme edge. Above it is expanded in the form of a small wing, which slightly arches over the sinus and has a tendency to a deflection in front. This species in the nature of its operculum agrees with the genus Myxostoma, which was founded by Troschel (' Zeitschrift fiir Mala- |
