534 THE VOYAGE OF H.M.S. CHALLENGER. 



the upper side of the whorl ; on the base they are narrower and set more closely, and four 

 or five delicate ones ornament the pillar. On the last whorl especially the upper spirals 

 are studded with close-set small round tubercles. The interstices are about three times as 

 broad as the threads themselves, and are delicately fretted with very fine spiral lines. 

 Colour a translucent white, dead towards the apex, with some irregular brownish stains 

 on the spire ; the varices are dead- white, the spiral threads are brilliant brown and are 

 spotted with white tubercles. Spire tall, conical, and a little bent. Apex sharp but rounded. 

 WJwrls 20, of very slow and regular increase, scarcely convex, but the last is a little tumid, 

 flattened on the base, but not at all angulated, and bisected by an exceptionally large varix. 

 Suture linear, but with a very slight impression. Mouth nearly semicircular, from the 

 great sweep of the outer lip, and the very slight relative concavity of the whole inner lip 

 from the upper corner of the mouth to the point of the pillar ; porcellanous within. At 

 its upper angle there is a narrow little corner formed by a slight contraction of the lip 

 towards the body, and by the elevation of the second basal thread into a tooth by a 

 porcellanous thickening at this point. Outer lip ascends slightly on the body-whorl, 

 towards which at the same time it is a very little pinched in. From this point to the 

 edge of the canal it forms a very equable curve ; slightly retreating at first so as almost to 

 form a shallow open sinus, it is thrown out into a wing-like projecting expansion in the 

 middle. It is patulous, reverted, thin on the edge, but thickened within by a glossy 

 porcellanous callus, stained dark brown at the ends of the spiral threads. The short 

 anterior canal bends over towards the pillar, is well defined, round, with the oral lips a 

 little contracted, and its front margin a good deal reverted. The pillar is short, straight, 

 narrow, at the point sharp and bent to the left, with a narrow and twisted edge ; in colour 

 porcellanous white. Inner lip is glossy, rising into a tooth on the first intra-oral thread, 

 spread out on the body, with a slightly thickened and well-defined edge on the pillar. 

 H. 1-6 in. B. 0-47, least do. 0-34. Penultimate whorl, height 0"23. Mouth, height 0'32, 

 breadth 027. 



This species in form and colour is not unlike Cerithium longicaudatum, Adams and Reeve, or 

 Cerithium attenuatum, Phil., but in details of whorls and of sculpture it is totally different. 



9. Cerithium jihoxum, 1 Watson (PI. XL. fig. 3). 



Cerithntm phoxum, "Watson, Prelim. Report, pt. 5, Journ. Linn. Soc. Lond., vol. xv. p. 106, 

 sp. 6. 



July 29, 1874. Levuka, Fiji. 12 fathoms. 



Shell. — Sharply conical, on the base contracted and a little obliquely flattened, longi- 

 tudinally ribbed with spiral tubercled threads, of a certain waxy whiteness tinged with 

 yellow and ruddy brown. Sculpture : Longitudinals — there are from ten to eleven straight 



1 P°!'£> tapering. 



