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1863.] MR. A. ADAMS ON THE LIOTIIN.flE OF JAPAN. 73 



2. Genus Cyclostrema, Marryatt. 



1. Cyclostrema micans, A. Ad., Proc. Zool. Soc. 1850. 



Cyclostrema 'pulchellum, Dkr. Moll. Japori. p. 20, t. 3. f. 5. 

 Hab. Seto-Uchi ; Tsu-Sima ; Mososeki ; Akasi. 



2. Cyclostrema cinguliferum, A. Ad., Proc. Zool. Soc. 1850. 

 Hah. Tsu-Sima, 26 fathoms ; Mino-Sima, 63 fathoms. 



3. Cyclostrema cingulatum, Dkr. 



Cyclostrema cingulatum, Dkr. Moll. Japon. p. 20, t. 3. f. 11. 

 Hab. Tsu-Sima, 26 fathoms. 



4. Cyclostrema sulcatum, A. Ad., Proc. Zool. Soc. 1850. 

 Hab. Mososeki ; Tsu-Sima. 



5. Cyclostrema anaglyptum, A. Ad. 



C. testa depresso-turbinata, alba, nitida, profunde et late umbi- 

 licata, spira elatiuscula ; anfractibus rotundatis, carinulis 

 concentricis aciitis crenulatis, interstitiis lineis radiantibus 

 late clathratis ornatis, basi carinulis confertis denticulatia 

 instj'ucta ; umbilico magno, intus radiatim lirato ; apertura or- 

 biculari, margine crenato. 

 Hab. Yobuko. 



A very beautiful, richly embossed shell, with the style of sculpture 

 very much resembling that of C. reeviana, but the form is more 

 turbinate than in that pretty species. 



6. Cyclostrema ammonoceras, A. Ad. 



C. testa depresso-turbinata, discoidea, late umbilicata, alba, so- 

 lida, concentrice striata, radiatim costata, costis tenuibus sub- 

 distantibus ad suturas evanidis ; anfractibus rotundatis ; aper- 

 tura circulari, peritremate continuo ; labio callo parvo resu- 

 pinato instructo. 

 Hab. Tanabe ; 0-Sima. 



The only species resembling this is C. schrammi, Fisch., from 

 Guadeloupe, which has the same remarkable cornu-Ammonis appear- 

 ance, but ihe whorls of which, instead of being rounded, have two 

 concentric keels, which gives the species, says M. Fischer, the ap- 

 pearance of Planorbis cristatus with three rows of spines. 



7. Cyclostrema biporcatum, A. Ad. 



C. testa parva, subdiscoidea, spira depressa, albida, late umbili- 

 cata ; anfractibus 3, subplanulatis, ultitno antice dilatato, su- 

 pra leevi, infra concentrice striata, ad peripheriam liris duabus 

 validis transversis instructo ; apertura circulari, peritremate 

 continuo, simplici. 



Hab. Seto-Uchi ; Akasi. 



This little species differs from any of those described, and may easily 

 be recognized by the double keel which surrounds the periphery. 



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