]()2 I'UOCKEDINGS OF THE MALACOLOGICAL SOCIKTV. 



caiidati, perla3ves, fusco-vitrei, nunc siibdistorti, delicate striati, cseteris 

 cylindraceis, spiraliter triliratis, liris papilloso-gemmatis, ultimo 

 anfractu quadrilirato, apertura subrotunda, labro tenui, canali brevi. 

 Long. 2, lat. 1 mm. 



One of the smallest of mollusks, peculiar for its very attenuate, 

 caudate apex ; the sculpture of the shell is normal ; the nearest 

 approaches to it seem to be Ceritlnofns ridicula and turrigera,^ 

 AVatsou. From the first of these it differs in its coloured apical 

 whorls, those of ridicula being white, with only seven whorls in all, 

 as against nine in the present species. C. turrigeia is more rt!motely 

 allied, its ornamentation consisting of only two spiral rows of gemmate 

 lirae. It is often hard to know where Bittium begins and Cerithiopsis 

 ends ; C. ridicula, especially, looks like one of the former genus, and 

 as such I, for my part, would classify it. 



Trifora concatenata, n.sp. PI. X, Fig. 9. 



T. testa pergracili, multum attenuata, albescente, albo-fusca, anfrac- 

 tibus ad 18, quorum apicales 4, ochracei, spiraliter unicarinati, arete 

 et pulcherrime sub lente longitudinaliter lirati, liris sinuosis, cseteris 

 rectis, suturis indistinctis, tribus gemmularum ordinibus concatenatis 

 praeditis, gemmulis rotundis, nitentibus, ultimo anfractu quatuor 

 ordinibus, circa basim angulato, apertura rotundo-ovata, labro simplice, 

 canali brevi. Long. 5, lat. 1 mm., sp. max. 



A small, \exj gracefully attenuate species, white or whitish-drab, 

 with ochreous apical whorls, these being once keeled spirally, the 

 usual pattern being present on the remaining whorls of three rows of 

 round, shining gemmse — four on the body'-whorl, the lowest row being 

 the largest ; these spiral rows are more or less concatenate, leaving 

 clear spaces between. 



TUEBONILLA IN^QUALIS, n.Sp. PI. X, Fig. 10. 



T. testa pergracili, nitida, albida, Isevissima, anfractibus 9, quorum 

 apicales duo magnopere heterostrophi, vitrei, pellucentes, globosi, 

 caeteris gradatulis, nitidis, interdum inaequalibus et quasi-varicosis, 

 costulis longitudinalibus Isevibus, rectis, praeditis, ultimo anfractu fere 

 recto, costulis versus basim evauidis, apertura ovali, labro tenui, 

 margine columellari paululum incrassato. Long. 5, lat. 1*15 mm. 



Peculiar for its often exhibiting pseudo-varices, these being simply 

 unequally effuse longitudinal ribs. The surface of the shell is 

 remarkably smooth, white, and shining, the mouth a perfect oval, and 

 the heterostrophe apex glassy, globular, and completely reversed. 

 2\ Peronii, Velain, from St. Paul's Island, Indian Ocean, seems akin. 



TURBONILLA MICROPERONE,'^ U.Sp. PI. X, Fig. 11. 



T. testa fusiformi, curta, albescente, paullum incrassata, anfractibus 9, 

 ventricosis, undique arete costulatis, costis crassis, obliquis, numero 



' Rep. Challenger Exped., vol. xv, pp. 528, .'529, pi. xxxviii, figs. 1, 2. 

 ^ fi'iKpos, small ; irfpovq, a pin. 



