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, with 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 in front. 



1. Rimula exqxjisita, A. Adams. R. tesfd magnd, ovali, semi- 

 pellucidd, albd, costis longitudinalibus, radiantibus, li7ieisque 

 elevatis, transversis, concentricis, cancellatd ; cancelli subqua- 

 drati ; costis crenulatis, ineequalibus, prominentibus, anterio- 

 ribus duabiis divergentibus, interstitiis costellis duabiis in- 

 structis ; supra perforationem concavd ; perforatione elongatd 

 subquadratd. 



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

 dead shells, 7 and 10 fathoms, sandy mud {H. C). Mus. Cuming. 



2. Rimula CuMiNGii, A.Adams. jK. testd pared, 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 pared, ovali, costel- 

 lis simplicibus, permultis, confertis, longitudinalibus, radianti- 

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

 tellis duabus anterioribtis, antice convergeiitibus, et apud aper^ 

 turce marginem junctis ; interstitiis, supra perforationem, con- 

 vexis, supra verticem extendentibus, quasi carind ; perforatione 

 ovali, angustd, antice angustatd. 



Hab. Cagayan, pro^■ince of Misamis, island of Mindanao, on dead 

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



4. Rimula propinqua, A. Adams. R. testd parvd, elongato- 

 ovali ; costellis prominentibus, asperis, longitudinalibus, ra- 

 diantibus, subdistantibus ; interstitiis valde cancellatis; can- 

 celli transversi, subqtiadrati ; costellis duabus anterioribus, 

 antice convergentibus, ad apertures tnargiriem junctis ; perfo- 

 ratione angustato-ovali, antice acuminatd. 



Hab. Catapan, Philippines. Mus. Cuming. 



