CYCLOSTREMA.— Plate I. 



increasing ; last whorl three-keeled ; middle keel 

 prominent, produced at the aperture into a tongue- 

 shaped lobe ; umbilicus middle-sized, flattened ; 

 aperture large, outer lip angular below, with 

 tongue-shaped projection in the middle. 



Fischer (Adeorbis). Journ. de Conch., pi. 10, f. 13. 



Hab. California. 



Species 5. (Mus. Adams.) 



CrcLOSTRESiA ANAGLTPTA. Cyc. tcstd trocMfomii , 

 solidd ; spird exsertd ; ultimo anfractu, earinis 

 moniliformibus trihus cincto, umbilico lata, planato ; 

 aperturd rotunda, labia extemo extus crenulato. 



The chased Ctclostuema. Shell trochiform, solid ; 

 spire exserted ; last whorl encircled with three 

 beaded keels, umbilicus broad, flattened ; aper- 

 ture rounded, outer lip crenulated outside. 



A. Adams. Ann. and Mag. of Nat. Hist., 1863. 



Hab. Seto-Uchi, Japan. 



Species 6. (Fig. a, b, Mus. Brit.) 

 Ctclostrema cancellata. Ci/c. testd suUenticulari, 

 depressd ; spird planulatd ; ultimo unfraciu niagno, 



medio cannato, supra infrdque carinam costis validis 

 concentncis et liris interstitialibus spiralibus can- 

 cellatd ; aperturd magnd ; umbilico mediocri. 



The cancellated Cyclosteema. Shell sublenticular, 

 depressed, spire flattened ; last whorl large, keeled 

 in the middle, cancellated above and below the keel 

 with strong concentric ribs and interstitial spiral 

 ridges ; aperture large ; umbilicus middle-sized. 



Maryatt. Trans. Linn. Soc, 1818. 



Hab. West Indies. Philippines. 



Species 7. (Fig. a, b, Mus. Adams.) 



Cyclosteema biporcata. Cyc. testd orbiculato-depressd ; 

 spird planulatd; ultimo anfractu depresso, acute 

 bicarinato, carind inferiori m,agis prominenti ; 

 aperturd subrotundd ; labio extemo bilobato ; 

 umbilico parviusculo. 



The two-ridged Cyclostrema. Shell orbicularly de- 

 pressed ; spire flattened ; last whorl depressed, 

 with two sharp keels, the lower keel more promi- 

 nent ; aperture rather rounded ; outer lip two- 

 lobed ; umbilicus rather small. 



A. Adams. Ann. and Mag. of Nat. Hist., 1863. 



Hab. Seto-Uchi, Japan. 



