CERITHIOPSIS. 175 



C. DEXTROVERSA, Ads. and Reeve. PL 36, fig. 64. 



Whorls about 18, spirally tricarinate, the middle carina much 

 smaller, between them wider interspaces or channels, distinctly lon- 

 gitudinally striate; whitish. Length, 12'5 mill. 



China Sea. 

 C. CEREA, Sowb. PI. 36, fig. 65. 



Whitish, with three spiral ribs, and narrower intermediate sulci. 



Length, 16 mill. 



Australia. 

 C. CROCEA, Angas. PI. 36, figs. 66, 67. 



Rather thin, orange colored, deeper tinted in the channels ; 

 whorls 14, each with four rounded, close-set spiral ribs, the very 

 narrow interstices -longitudinally striated, base flattened and smooth, 

 nuclear whorl sinistral. Length, 10 mill. 



Port Jackson, Australia; Viti Is. 

 Var. PURPUREA, Angas. Fig. 67. 



Purplish brown, the ribs usually lighter tinted, a little more 

 cylindrical, with a narrower base, and smaller than the type. 

 Length, 7 mill. Tenison-AVoods has described, but not figured, a 

 variety Atkinsoni. 



Section LOVENELLA, O. Sars., 1878. 

 0. METULA, Loven. PI. 36, fig. 68. 



Solid, opaque, glossy, yellowish white ; whorls 18-20 with two or 

 three thread-like spiral ridges (four or five on the last whorl) and 

 slight microscopic intermediate striae and growth lines, the ridges 

 are crossed by numerous curved, fine ribs, producing nodules or 

 small tubercles at the points of intersection, base and apical whorls 

 smoothish, the apex bulbous and obliquely twisted ; canal distinct, 

 narrow, twisted. Length, 20 mill. 



Norway to Bay of Biscay, Villafranca. 



C. nitidum, McAndrew and Forbes, is a synonym. 



C. OBELISCOIDES, Jeffreys. PI. 36, fig. 69. 



Rather thin, semitransparent, glossy, white ; whorls 7-9, convex, 

 with deep suture defined by a spiral thread, with numerous fine 

 longitudinal striae, and several thin spiral threads on the middle of 

 the whorls. Length, 4 mill. 



Atlantic 0. (Porcupine Exped.). 



C. CYLINDRATUM. Jeffreys. PI. 36, fig. 70. 



Thick, opaque, lustreless, pale yellowish brown ; whorls 10-12, 

 rounded, but compressed, with numerous straight longitudinal, 



