244 Mr. A. Adams on new MoUusca from China and Japan. 



of Cynisca. This was founded on a shell in Mr. Cuming's col- 

 lection, which I described, under the name of Cyclostrema grami- 

 lata, in the 'Proc. Zool. Soc' 1853, p. 183. The great pecu- 

 liarity consists in the aperture, which is something like that of 

 Stoastoma, the inner lip being straight, and the outer lip being 

 continued posteriorly on the penultimate whorl beyond the 

 inner lip. A second species, as far as I can make out by the 

 figure and brief description, is Delphinula australis (Kien., Spec. 

 Gen. p. 8, tab. 4. fig. 7, copied in Reeve, Conch. Icon. sp. 20, 

 and by Philippi, Conch. Cab. tab. 5. fig. 13). I now add the 

 description of a third species from Japan. 



Cynisca japonica, A. Adams. 



C. testa turbinata, anguste umbilicata, alba, solida, transversim lirata, 

 liris elevatis confertis, ad suturas vix granulatis ; anfractu ultimo 

 ad peripheriam rotundato ; umbilico parvo, profundo, callo plicato 

 marginato ; apertura circulari ; labio recto ; labro incrassato, intus 

 lirato. 



Hab. Korea Strait ; 46 fathoms. 



This species differs from C. australis, Kien., in the margin of 

 the aperture not being reflexed, and from C. yranuhita, A. Ad., 

 in the umbilicus being small, and not wide and perspective, and 

 in the lirse of the whorls not being granulated. In not being- 

 pearly within, and in their white colour, these shells resemble 

 Cyclostrema, while in the peculiar callus which surrounds the 

 umbilicus and the sulcate style of sculpture they remind one of 

 Monilea. 



Genus Adeorbis, Searles Wood. 



The genus Vitrinella of the late Prof. C. B. Adams is composed 

 of a somewhat incongruous assemblage, having one feature only 

 in common, namely transparency. If form be considered, many 

 species must be arranged under Adeorbis. The little shells I now 

 describe are more or less pellucid, but they have all the characters 

 of Adeorbis. The small shells described by D'Orbigny as spe- 

 cies of Rotella, namely R. striata, pusilla, carinata, and anomala, 

 are species of Adeorbis. The type of Pseudorotella, Fischer 

 (R.semistriata, D'Orb.), which has the umbilicus nearly covered 

 by a thick callus, I consider to belong to Ethalia, a subgenus of 

 Umbonium. I may here observe that the Omphalogyra of Jef- 

 freys, founded on Skenea nitidissima, is a synonym of Spira, 

 Brown. The very remarkable shell described by me as Cyclo- 

 strema spirula is neither a Spira nor a Serjndaria, and the name 

 of the subgenus may therefore be changed into Daronia. M. 

 Fischer has recently endeavoured to throw some light upon these 

 little obscure genera; but he seems to have given up his original 



