THE MOLLUSCA HEDLEY. 435 



spire, the penultimate whorl has ten and those 



above a proportionate decrease ; they are weak at 



the suture, which they barely sinuate, and gain 



in breadth and height as they cross the whorl, 



projecting over the suture beneath them. They 



do not cross continuously from whorl to whorl, nor 



do they regularly alternate; they grow evanescent 



on the last whorl and cease with a stout and heavy 



varix one-third of the whorl behind the aperture. 



In this latter space, reminiscences of them occur 



as tubercles on the angle and at the suture. On 



the last whorl about twenty fine spiral threads are pj g 2 3 



evenly distributed between the suture and the 



anterior point of the shell ; the uppermost of these ascend the 



spire and are alike prominent on ribs and interspaces. Aperture 



perpendicular, subtriangular ; columella sharply sinuate, anterior 



notch not produced into a canal ; callus on body whorl slight ; 



outer lip thickened slightly and reflected, angled sharply at the 



posterior insertion. Length 4|, breadth 2 mm. 



Seven examples from the lagoon beach. Perhaps this is a 

 member of the subgenus Colina. 



CERITHIUM PIPERITUM, Sowerby. 

 Tryon, loc. cit., p. 144, pi. xxvii., figs. 31, 32. 



Mr. G. Sweet procured a few dead shells of this species at Funa- 

 futi. It had previously been recorded from the Ellice by Schmeltz, 

 and also from Upolu and Rarotonga. There are examples from 

 Tahiti in this Museum. 



CEBITHIUM OBELISCUS, Bruguiere. 

 Tryon, loc. cit., p. 146, pi. xxvii., fig. 39. 



One specimen from the lagoon beach. Melvill and Standen 

 report this from the Loyalties ; Schmeltz from Fiji and Cook's 

 Islands; and Smith from Tonga.* In this Museum it is represented 

 from Cooktown and Port Curtis, Queensland, also New Caledonia, 

 Lord Howe Island and Hawaii. 



CERITHIUM OBELISCUS, var. CEDO-NULLI, Soiverby. 

 Tryon is here followed in reducing this to varietal rank. In 

 Funafuti it is represented by an extremely small and stout 

 individual, 22 mm. long. First found at Anaa, Paumotus. 



CERITHIUM ASPERUM, Linne. 

 Tryon, loc. cit. t p. 148, pi. xxviii., figs. 62, 63. 



One of the commonest shells on the lagoon beach ; the lineated 

 form dominant. It was taken by the "Chevert" in Torres Straits, 



* Smith Proc. Zool. Soc., 1891, p. 416. 



