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Show 1895.] MOLLUSCA OF T H E A N D A M A N AND NICOBAR ISLANDS. 451 minute shells eight specimens of this very curious and interestiug Pupa (Pupisoma) constrictus. xl2. Its sculpture is like that of Pupisoma lignicola, Stol., from Moulmein, and I think it better to place it near this than to create a new genus for it, which I at first intended ; I think it is best, however, to wait until some one else can examine the animal. Genus VAGINULUS. 1. VAGINULUS GIGANTEUS, n. sp. (p. 443). Locality. Andaman Islands (Harold Godwin-Austen). Animal elongate in form. Total length 68*0 mm. ; total breadth 23-0; breadth of foot 9*0; female orifice 28-5 from the extremity of the foot, 6-0 from the middle line of the foot, 1*5 from the pedal groove. The colour in the spirit-specimen is above grey, with dark mottlings, paler near the head, and a narrow pale line down the centre of the back; below dull ochre. Upper surface smooth to the eye, under the lens closely pitted. The sole of the foot narrow, slightly wider than the adjacent under surface. The foot is crossed by rather close, very regular folds, which form distinct grooves across it, very even in width; there are 22 such folds in 10 mm. of length, and each transverse fold is divided by a very fine secondary groove. The tentacles, although contracted, are large. This is a remarkably large species, 13 mm. larger than anything described by Semper from the Indian region ; the largest mentioned and figured by him is V. voigtii, described from a specimen in the Copenhagen Museum. Locality unknown. It differs from Semper's drawing of this species in being narrower as compared with its length, and in the sole of the foot. Semper's drawing is life-size, and could not fail to show the transverse ridges. As I have never yet dissected any species of this genus, I hesitate to begin upon a single valuable specimen until I have had some practice on well-known forms. Genus CYCLOPHORUS. 5. CYCLOPHORUS (CYCLOHELIX) NICOBARICUS, Behn (p. 444). This species is distinct from C. crocatus or turbo, and is at once distinguished by the very sinuate and oblique form of the 29* |