THE MOLLUSCA OF TOEEES STEAITS. 177 



margin a small central tooth is observable. A resemblance, but 

 merely superficial, may be traced to C.fragum, Phil. 



215. Calliostoma speciosum, A. Ad. 



216. EuCHELUS ANGTJLATUS, Pease. 



2iV7. Etjohelus ateatfs, Gmel. 



Station 13, Mer ; Station 2, Warrior Island. 



Delphinui-id^. 



218. Delphinula eoemosa, Bve. 

 Station 13, Mer. 



219. Ltotia varicosa, Bve. 

 Station 1, Thursday Island. 



Cyclosteematii) m. 



220. MiCEOTHECA ACIDALIA, sp. n. (PI. 10. figs. 10, 10 a.) 

 M. testa Candida, depresso-globosa, sculpturata, profunde um- 



bilicata ; anfractibus quatuor, quorum apicali simplici, nitido, 

 cseteris transversim pulcherrime carinatis, antepenultimo tribus, 

 penultimo, cum ultimo, quatuor carinis prgeditis, arete noduloso- 

 gemmatis, gemmis nitidissimis, interstitiis transversim arete 

 liratis, ultimis anfractu effuso ; regionem circa umbilicarem in- 

 crassato, nitido, plus minus crenulato, fere laevi ; apertura rotunda, 

 peristomate crassiusculo, contiauo ; operculo . . . . ? Alt. 3*50, 

 lat. 5 mm. 



Though small, one of the most exquisite shells yet discovered. 

 It is pure white, depressedly globular, four-whorled, inclusive of 

 the small and shining apical whorl, the remaining three being 

 in the uppermost or antepenultimate whorl thrice transversely or 

 spirally keeled, in the two lower whorls four times ; these keels 

 or spiral ribs are closely studded with, or indeed composed of, 

 white shining gemmae which are round, crowded, and brilliant ; the 

 rest of the shell is finely and delicately spirally lirate or sculptured. 

 Aperture round, white within ; peristome thin, continuous. The 

 basal portion of the surface is thickened round the umbilical 

 region and more or less crenulate. 



M. crenellifera, Ad., the type of the genus, which we have 

 received from Bombay {Abercrombie), though originally reported 

 from Japan only, has the base and thickened crenulate umbilica 



