Zoological Society. 285 



distinguished by the absence of the arcuated plate in the interior of 

 the vertex. The species already known are fossil, to which we now 

 add a few recent examples. 



Genus Rimula, Defrance. 



Shell conical, with an elevated, recurved, entire vertex, turned 

 towards the posterior end ; surface cancellated, vnth radiating ribs ; 

 a linear perforation in the upper part of the shell, half-way between 

 the vertex and anterior margin ; margin of aperture crenulated ; in- 

 terior simple, with no shelly plate ; muscular impression crescentic, 

 interrupted m front. 



1 . RiMULA EXQXJisiTA, A. Adams. R. testd magnd, ovali, setni- 

 pellucidd, albd, costis longitudinalibus, radiantihus, lineisque 

 elevatis, transversis, concentricis, cancellatd; cancelli subqua- 

 drati; costis crenulatis, incequalibus, prominentibus, anterio- 

 ribus duabus divergentibus, interstitiis costellis duabus in- 

 structis ; supra perforationem concavd ; perforatione elongatd 



Hab. Catanuan, island of Luzon and island of Burias, found on 

 dead shells, 7 and 10 fathoms, sandy mud (JS. C). Mus. Cuming. 



2. RiMULA CuMiNGii, A. Adams. R. testd parvd, ovatd, opacd, 

 costellis longitudinalibus, radiantibus, lineisque transversis, eras- 

 sis, concentricis, cancellatd; cancelli transversi, elongati ; costis 

 nodulosis, subcequalibus, prominentibus, distantibus, anteriori- 

 bus duabus antice divergentibus, interstitiis costellis duabus in- 

 structis, perforatione elongatd, subquadratd. 



Hab. Eastern Seas. Mus. Cuming. 



3. RiMULA CARiNATA, A. Adams. R. testd parvd, ovali, costel- 

 lis simplicibns, permultis, confertis, longitudinalibus, radianti- 

 bus, ornatd; interstitiis cancellatis ; cancelli punctiformes ; cos- 

 tellis duabus anterioribus, antice convergentibus, et apud aper- 

 turce marginem junctis ; interstitiis, supra perforationem, con- 

 vexis, supra verticem extendentibus, quasi carind ; perforatione 

 ovali, angustd, antice angustatd. 



Hab. Cagayan, province of Misamis, island of Mindanao, on dead 

 shells, 25 fathoms, sandy mud {H. C). Mus. Cuming. 



4. RiMULA PROPiNauA, A. Adams. R. testd parvd, elongato- 

 ovali ; costellis prominentibus, asperis, longitudinalibus, ra- 

 diantibus, subdistantibus ; interstitiis valde cancellatis; can- 

 celli transversi, subquadrati ; costellis duabus anterioribus, 

 antice convergentibus, ad apertures marginem junctis ; perfo- 

 ratione angustato-ovali, antice acuminatd. 



Hab. Catapan, Philippines. Mus. Cuming. 



