THE MOLLUSCA HEDLEY. 423 



from eight to sixteen, spiral brown threads. 

 These lines sometimes'coalesce and produce a 

 colour pattern of opaque white blotches on 

 a dark chestnut ground. The opaque white 

 spaces vary in number and extent; when re- 

 stricted they appear as a series of rhombs 

 on the periphery and triangles on the suture; 

 by confluence these form longitudinal ragged 

 stripes and separate the barred or brown 

 tracts into rough ovals. This colouration is 

 visible within the aperture. Sculpture 

 longitudinal growth lines are perceptible; . 



the whole body whorl is evenly spaced by 



about a dozen, wide, very shallow grooves, upon the narrow in- 

 tervening ridges of which are apt to occur the chestnut bars ; the 

 peripheral groove is the most distinct. Whorls seven, gradually 

 increasing, slightly rounded ; embryonic whorl one, minute, tur- 

 binate. Suture deeply impressed. Aperture slightly oblique, 

 ovate, pointed posteriorly, rounded and effuse anteriorly ; colum- 

 ella reflected, stained medially with chestnut ; callus on body 

 whorl slight, outer lip straight, simple. Operculum thin, corneous, 

 ovate, paucispiral. Length 2f, breadth 1 mm. 



"Very abundant ; alive on stones and shells in shallow water in 

 the lagoon. 



This species differs from D. albugo, Watson, and D. ludens, 

 Melvill and Standen, by a dull instead of a glossy surface, and 

 by the opaque tracts occurring in larger continuous sheets instead 

 of being scattered in small and numerous dots. 



From the description of Rissoa flammea, Pease,* I suppose that 

 it is either the same or very like the shell before me. 



DIALA HARDYI, Melvill & Standen. 



Melvill & Standen, Journ. Conch., viii., 1895, p. 118, pi. ii., 

 fig. 10. 



This species is common in the lagoon. I have identified it with 

 a species I took at Panie, New Caledonia, which answers to the 

 account of the Lifu shell. 



SOLARIUM HYBRIDUM, Linne. 

 Tryon, Man. Conch, ix., 1887, p. 14, pi. v., figs. 59-62. 



A dead example from the lagoon beach. 



Recognised by Melvill and Standen from Lifu, by Schmeltz 

 from Samoa, Tonga, and Cook's Islands, and represented in this 

 Museum from Teste Island, Louisiades. 



* Pease Am. Journ. Conch., iii., 1867, p. 297, pi. xxiv., fig. 33. 



