66 COLLECTIONS FEOM MELANESIA. 



68. Cerithium torresi. (Plate V. fig. 0.) 



Shell elongate-pyramidal, white, blackish towards the apex, 

 ornamented with transverse series of dark-brown dots upon the 

 lirsB between the longitudinal granose costae. Whorls 11, very 

 slightly convex, separated by a deepish suture, costate and trans- 

 versely Urate, the points of intersection of the ribs and ridges being 

 developed into prominent white nodules. The spiral Urae which 

 become nodulous are three in number in the upper whorls, the 

 uppermost being situated close to the suture, the next a little above 

 the middle, and the lowermost below it, but more remote from the 

 suture than the uppermost. In addition, there are one or more 

 simple thread-like lines revolving between the granulous ridges, 

 which are also articulated with brown. The body-whorl has about 

 eight principal transverse ridges, of which the three uppermost are 

 the thickest, the two next rather finer and also granulous, the 

 three remaining ones being still more slender and more feebly 

 nodulous. The longitudinal ribs are about twelve on a whorl, one 

 of them being swollen or varicose. The last varix on the body- 

 whorl is situated on the left of the aperture ; this is small, obliquely 

 oval, terminating anteriorly in a short, oblique, and very slightly 

 recurved canal. The columella is considerably arched, white, 

 covered with a thin callosity, developed at the upper part into an 

 elongate ridge which runs within the aperture. Labrum varixed 

 externally, also thickened a little within and shallowly grooved, 

 the grooves corresponding with the external ridges. Length 14J 

 millim., diam. 5 ; aperture 4| long and 2^ wide. 



Hah. Prince of Wales Channel, Torres Straits, 3-4 fms. 



69. Cerithixun (Colina) macrostoma. 



Cerithium macrsotoma, Ilinds, Vol/. 'Sulphur,'' p. 27, pi. xvi. figs. 11, 

 12 ; Sowerby, Thes. Conch, pi. 184. fig. 219 ; id. Conch. Icon. figs. 

 118 a,b. 

 Var. = Oolina pupiformis, A. Adams, Proc. Zool. Soc. 1853, p. 176, 

 pi. XX. fig. 14 (enlarged). 

 = Ceiithium pupEeforme {A. Adams), Sowerby, Thes. Conch. 

 vol. ii. pi. 184. fig. 221 ; id. Conch. Icon. figs. 122 a, b (bad !). 

 Var. = Colina costata, A. Adams, P. Z. S. 1854, p. 86. 



= Cerithium costiferum, Sowerby, Thes. Qmih. vol. ii. pi. 184. 

 figs. 222 ; id. Conch. Icon. figs. 117 a, h. 

 Var. = Colina pygmsea, H. Adains, Proc. Zool. Soc. 1867, p. 308, 

 pL 19. fig. 19. 



ffab. Thursday Island, Torres Straits, 5-7 fms. (Coppinger) : 

 Straits of Macassar, 11 fms. (Hinds); Damaguete, Philippine 

 Islands {Cuming for O. pupiformis) ; Philippine Islands (Cuming 

 for C. costata); Borneo (H. Adams for O. pygmcea). 



The above-named and so-called species I believe to be mere 

 variations of one and the same shell. Compare the extreme forms 

 ( C. macrostoma and 0. pygmma), and one perceives a vast difference 

 in outline and the number of whorls ; but even here several features 

 in common wiU be found, namely the spotted expanded outer lip, 



