142 Zoological Society. 



16. Helicina dominicensis, Pfr. H. testd globoso-conicd, so- 

 liduld, concentric^ confertim striatd, parum nitidd, albidd, luteo' 

 velfulvo-zonatd ; spird canted, acutd ; anfractibus 6, planiuscutis, 

 suturd pro/undd junctis , ultimo convexiore, vix descendente ; colu- 

 melld brevissimd, basi denticulatd, callum emittente tenuem, vix 

 circumscriptum ; aperturd pariim obliqttd, semiovali ; peristomate 

 acuto, subrecto. Operculum tenue, testaceum, carneum, margine 

 columellari elevate. 



Diam. maj. 6^, min. 5f, alt. 5 mill. 



Hab. St. Domingo {8ail6). 



Descriptions of new Species of Trochid^. 

 By Arthur Adams, R.N., F.L.S. etc. 



Genus Trochus, Linn. — Pyramidea, sp. Swains. 



1, Trochus Cumingii, A.Adams. T. testd turrito-conicu, vio- 

 laced, maculis viridibus pulcherrime pictd ; anfractibus planis, 

 cingulis granorum moniliformibus ornatis, infernh nodoso-pli- 

 catis, an/ractu ultimo angulato, peripherid radiatim nodo-spi- 

 nosd, basi concavd, cingulis granulosis, insculptd, centra pro- 

 funde excavato umbilicum simulante ; columelld superne tor- 



tuosd, basi dente terminatd ; aperturd tetragond ; labro intus 

 lirato. 

 Hab. Sibonga, island of Zebu, under stones at low water (H. C). 

 Mus. Cuming. 



2. Trochus fastigiatus, A. Adams. T. testd conicd, imper- 

 foratd, rubrd, maculis albis longitudinalibus variegatd ; an- 

 fractibus planis, in medio concavis, superne cingulis tribus 

 nodulorum ornatis, ad suturam nodis subspinosis instructis, 

 basi pland, concentrice liratd ; liris crenulatis ; columelld pos- 

 tice canaliculatd, antice truncatd ; labro in medio angulato. 



Hah. ? 



Genus Pyramis, Chemn. 



Tectus, Montf. — Pyramidea, sp. Swains. 



1. Pyramis architectonicus, A. Adams. P. testd conicd, 

 imperforatd, albidd ; anfractibus planis, subimbricatis, longi- 

 tudinaliter costatis, costis crassis, rotundis, subnodosis, basi 

 pland, liris concentricis exaratd ; columelld brevi, tortuosd, 

 antich truncatd; labro margine fimbriato. 



Hab. Signet Bay, North Australia {Bring). 



2. Pyramis leucogaster, A. Adams. P. testd conicd, im- 

 perforatd ; spird acutd, in medio tumidd, albd, viridi variegatd ; 

 anfractibus planulatis, longitudinaliter corrugatis, transversim 

 cingulis nodulosis ornatis, ad suturam nodis sulcatis Jimbriatis, 

 basi pland, albd, concentrice sulcatd ; columelld brevi, valde tor- 

 tuosd ; labro antice intus lirato. 



Hab. ? 



