43 
contiguis, ultimd distinctd, transversim costulatis, costellis sub- 
confertis, cequidistantibus ; interstitiis tenuissime longitudina- 
liter striatd ; aperturd circulari ; peritremate continuo. 
Hab. in insulis Philippinis. (Mollusca, Pl. VIII. fig. 22.) 
Shell orbicular, discoid, evolute; spire depressly concave; wliorls 
rounded, the first contiguous, the last separate, transversely ribbed, 
ribs equidistant, close together ; interstices very finely longitudinally 
striated ; aperture circular ; peritreme continuous. 
Hab. Philippine Islands. (Mus. Cuming.) 
Cyclostrema cingulifera, Adams. C. testd orbiculari, ni- 
tida ; spird depressd, anfractibus rotundatis, carinulis trans- 
versis, acutis , cequidist antibus; interstitiis (sub lente ) tenuis¬ 
sime longitudinaliter striatis; aperturd subcirculari, supra 
subangulatd ; umbilico mediocri. 
Hab. in insulis Philippinis. 
Shell orbicular, shining; spire depressed; whorls rounded, with 
equidistant, small, acute, transverse keels ; interstices (under the 
lens) very finely longitudinally striated; aperture subcircular, angu¬ 
lated above; umbilicus moderate. 
Hab. Dumaguete, island of Zebu, 4 fathoms; H. C. (Mus. 
Cuming.) 
Cyclostrema nitida, Adams. C. testd orbiculari, Icevi, tenui , 
nitida; spird elevatiuscula , anfractibus prope suturam suban- 
gulatis; suturis profundis, subcanaliculatis ; aperturd subcir¬ 
culari, supra angulatd ; umbilico mag no , peromphalo angulato, 
acuto. 
Hab. in insulis Philippinis. 
Shell orbicular, smooth, shining; spire rather elevated ; whorls 
somewhat angulated near the suture ; suture deep, subcanaliculated; 
aperture subcircular, angulated above; umbilicus large, peromphalus 
acutely angulated. 
Hab. Catanuan and Sual, island of Luzon, 10 fathoms, sandy mud ; 
H. C. (Mus. Cuming.) 
Cyclostrema planorbula, Adams. C. testd orbiculari, plan- 
orbula; spird depressd, anfractibus Icevibus, rotundatis, suturis 
distinctis; aperturd subcirculari, supra angulatd; umbilico 
permagno, patulo. 
Hab. in insulis Philippinis. 
Shell orbicular, planorbular; spue depressed, whorls smooth, 
rounded, suture distinct; aperture subcircular, angulated above ; 
umbilicus very large and open. 
Hab. Sual, island of Luzon, 10 fathoms, sandy mud; H. C. (Mus. 
Cuming.) 
Cyclostrema plana, Adams. C. testd orbiculari, dorso plano- 
convexd; spird depressd, anfractibus planis, supra transversim 
striatis, infra Icevibus ; aperturd subcirculari, supra angulatd ; 
umbilico peramplo, anfractibus intus conspicuis. 
Hab. in insulis Philippinis. 
Shell orbicular, back plano-convex; spire depressed, whorls flat- 
