43 
contiguis, ultimd distinctd, transversim costulatis, costellis sub- 
confertis, equidistantibus ; interstitiis tenuissimé longitudina- 
liter striatd ; aperturd circulari ; peritremate continuo. 
Hab. in insulis Philippinis. (Mollusca, Pl. VIII. fig. 22.) 
Shell orbicular, discoid, evolute ; spire depressly concave ; whorls 
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.) 
CyYCLOSTREMA CINGULIFERA, Adams. C. testd orbiculari, ni- 
tidd ; spird depressd, anfractibus rotundatis, carinulis trans- 
versis, acutis, equidistantibus ; interstitiis (sub lente) tenuis- 
simé longitudinaliter striatis ; apertura 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.) 
CycLostTrEMA NiITIDA, Adams. (C. testd orbiculari, levi, tenui, 
nitidd ; spird elevatiusculd, anfractibus prope suturam suban- 
gulatis ; suturis profundis, subcanaliculatis ; apertura subcir- 
culari, supra angulatd ; umbilico magno, 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. 
Had. Catanuan and Sual, island of Luzon, 10 fathoms, sandy mud ; 
H.C. (Mus. Cuming.) 
CycLosTREMA PLANORBULA, Adams. C. testd orbiculari, plan- 
orbuld; spird depressd, anfractibus levibus, rotundatis, suturis 
distinctis ; aperturd subcirculari, supra angulatd ; umbilico 
permagno, patulo. 
Hab. in insulis Philippinis. 
Shell orbicular, planorbular; spire 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 levibus ; aperturd subcirculari, supra angulatd ; 
umbilico peramplo, anfractibus intus conspicuis. 
Hab. in insulis Philippinis. 
Shell orbicular, back plano-convex ; spire depressed, whorls flat- 
