97 



are not very evideut, but once discovered they will be found con- 

 stant. 



RiNGicuLA CAEON. Rtu. tcstd ovūtd, ūcuminatd, striatd, nitidd; 

 an/ractibus rotundatis, ultimo ^ubtransverso, rotundato, distanter 

 striato ; spird exsertd ; aperturd subabbreviatd ; labro corrugato. 

 Axis If lin. 

 Hab. Straits of Malacca ; in seventeen fathoms, mud. 

 Cab. Belcher. 



The greatest breadth of the lašt whorl is probably in the trans^'erse 

 direction, and it is grooved vvith strise placed at regular distances 

 from each other. The spire also is proportionately lengthened. 



RiNGicuLA ExsERTA. Rin. testd ovatd, acuminatd, Itevigatd, politd 4 

 anfractibus rotundatis, l<Evigatis ; spird elongatd į Jąbro pone valdi 

 incrassato. Axis 1| lin. , ; 



Hab. Camiguing ; in forty fathoms, sandy mud : Sorsogon, island 

 of Luzon ; in sis fathoms, coarse sand ; — both in the Philippines. 

 Cab. Cuming. 



Compared with R. grandinosa, the lašt whorl is small, but agrees 

 in being quite smooth and round ; the spire is elongated, as in R. 

 caron, and the labrum is even rather mere reflected than is usual. 



RiNGicuLA AūSTRALis. RiH. tcstd ovotd, ocuminatd, Icevigatd, po- 

 litd; anfractibus rotundatis, penultimo sensim minore ; spird elon- 

 gatd, infrd suturam fascid subalbidd cinctd. Axis 1^ fin. 



Hab. Port Lincoln, Australia. 



Cab. Metcalfe. 



The only specimen before me has not attained its fiill adult age. 

 In its characters it is rather intermediate ; the spire is not so promi- 

 nently produced, and the penultimate whorl is more than usually 

 developed, so as to be more intermediate in size between the otliers. 

 AU these species are of one uniform glassy semiopake colour, in 

 some individuals being more glassy, in others more opake. 



NEiERA, Gray. 



Nedera lyrata. N. testd suborbiculari, tenui.fragili, diaphand, 

 liris transversis sulcatd, antice rotundatd ; rostra retusissimo ; 

 margine ventrali convexd. Long. 4į ; lat. 2 ; alt. 3^ lin. 

 Hab. Basay, island of Samar, Philippines ; in from five to seven 

 fathoms, sandy mud. 

 Cab. Cuming. 



This species is to Necera esactly what Mactra elegans is among 

 that group, the sculpture and oatline of the shells being so very 

 similar. This is of course comparatively a very miniature shell. 



NsiERA TENŪIS. N. testd ovali, fragili, diaphand, striis concentricis 

 incrementis rugosd, antice rotundatd, postice retusi rostratd ; mar- 

 gine ventrali antice subemarginatd. Long. 4į ; lat. 2 ; alt. 3^ lin. 



Hab. Bais, island of Negros, Philippines ; in seven fathoms, coral 

 sand. 



Cab. Cuming. 



