150 Zoological Society. 



ellipticd, valde depressd, apice subpostico, retrorsum inclinato, 

 costis Icevibus, radiantihus {circa 14), interstitiis costellis lon- 

 gitudinalibus, et lineis transversis lath elathratis ; aperturee 

 margine denticulate, lateribus antich angustatis, antice valdh 

 incise. 

 Hab. ? Mus. Cuming. 



Subgenus Clypidina, Gray. 



Shell ovate, conical, surface with radiated ribs ; vertex acute, cen- 

 tral, not recurved ; aperture with the margin crenulated ; muscular 

 impression fungiform, anal groove and emargination inclining towards 

 the right anterior margin (in the natural position of shell). 



1. Clypidina sulcifera, A.Adams. C. testa ovali, depresso' 

 conicd, viridescenti, vertice obtuso, ad partem posteriorem po- 

 sito; costellis radiantibus, interstitiis haud cequantibus, et striis 

 incrementi ornatis; basi arcuatd; aperturee margine crenulato, 

 incisurd haud profunda, sublaterali, intus in canalem productd. 



Hab. ? Mus. Cuming. 



2. Clypidina rudis, A. Adams. C. testd crassd, rudi, albidd, 

 depresso-conicd, costis otto angulatis radiantibus, interstitiis 

 costellis longitudinalibus et lineis concentricis decussatis ; apice 

 subcentrali ; basi arcuato ; aperturee margine crenato, antich 

 sinuato, sinu intus in canalem producto. 



Hab. 1 Mus. Cuming. 



3. Clypidina stellata, A. Adams. C. testd soliduld, albidd, 

 emptied, depresso-conicd, apice subcentrali, costis elevatis, sub- 

 spinulosis, radiantibus ; interstitiis costellis et striis crebris 

 decussantibus, exasperatis ; apertures margine dentate, sinu 

 sublaterali, intus in canalem apicem versus producto. 



Hab. Australia. Mus. Cuming. 



4. Clypidina scabricula, A. Adams. C. testd elongate-evali, 

 oblique conicd, costis radiantibus, elevatis, distantibus, asperu- 

 latis, interstitiis costellis longitudinalibus et lineis scabriusculis 

 valde cancellatd ; vertice subcentrali, post ice inclinato ; aper- 

 turee margine dentato-crenulate ; incisurd profunda, intus in 

 canalem productd. 



Hab. Australia. Mus. Cuming. 



5. Clypidina annulata, A.Adams. C. testd crassd, ellipticd, 

 albidd, annulo luteo-fusco circumcinctd ; costis elevatis asperis 

 radiantibus distantibus, interstitiis costellis longitudinalibus et 

 lineis transversis elevatis concinnh elathratis ; aperturee mar- 

 gine duplicate, incrassato, pulcher rime fimbriate, sinu quadrate 

 intus in canalem producto ; aperturd intus annuld albidd. 



Hab. Austraha. Mus. Cuming. 



6. Clypidina acuminata, A. Adams. C. testd elevato-conicd, 

 albidd, viridi anniilatd, costis longitudinalibus radiantibus, im- 

 bricato-asperis, interstitiis tricostulatis, costellis imbricato- 

 asperis ; stdcis transversis concentricis, distantibus, impressd ; 



