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Show 594 MR. E. A. SMITH O N SHELLS [June 2, both H. sebacea and H. cerealis under examination, I have no hesitation in pronouncing them identical. 16. HELIX (VIDENA) SANCTA ANNJ:. (Plate XXXVI. figs. 7, 7 b.) Shell depressed-conoid, deeply umbilicated, very acutely keeled at the periphery, light brown, sometimes with a few radiating pale streaks on the upper surface, sculptured with oblique lines of growth. Whorls 5, rather slowly increasing, slightly convex, depressed and margined above the suture, last not descending, compressed above and below the keel, a little convex towards the umbilicus, which is moderately large. Aperture transverse, flesh-tinted within. Peristome simple, a little thickened along the basal margin, with the extremities united by a thin callus. Height 7 millim.; greatest diameter 17, smallest 15. Hab. Santa Anna. " Living generally on the trunks of cocoa-nut palms" (Guppy). This species is very like H. latimarginata, Smith, from the Fiji Islands and Contrarietes Island, Solomon group; but is a trifle larger, more widely umbilicated, has a less convex spire, and a broader body-whorl. The pale streaks on the upper surface are like those in H. merziana, Pfr., but they do not occur in all examples. 17. HELIX (RHYTIDA) VILLANDREI, Gassies. Hab. Ugi Island (Guppy); San Christoval (Macyillivray, Angas, and Brazier). 18. HELIX (CAM^ENA) HOMBRONI, Pfeiffer. Hab. Shortland and Faro Islands (Guppy) ; Ysabel Island (Brenchley in Brit. Mus.) ; Solomon Islands (Hombron and Jac-quinot). "Admiralty Islands," the locality originally assigned to this species, is evidently incorrect. 19. HELIX (CHLORITIS) EUSTOMA, Pfeiffer. Hab. Ugi and Faro Islands (Guppy); New Georgia (Macyillivray). With this species should be united H. erinaceus of Pfeiffer, for having carefully compared the types of both forms, I do not find any difference, and therefore conclude that H. eustoma is another instance of a species wrongly assigned to the Admiralty Islands. 20. BULIMUS (PLACOSTYLUS) CLERYI, Petit. Hab. " The Koofeh district on the north coast of San Christoval" (Guppy). This remarkable species varies considerably in form, some specimens being much constricted round the middle of the body-whorl and much more slender than others, which show no trace of irregularity of outline. The type figured by Petit has a length of 100 |