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Genus Mouretia. 



MouRETiA Peruviana. Mour. testd subdepresso-conicd, albd, ra- 



diatim striatd ; vertice centrali ; epidermide corned, tenui. 

 Hah. ad oras Peruvise. (Cobija.) 

 Found on rocks at low water. — G. B. S. 



Mouretia stellata. Mour. testd depressd, squamiformi, albd, 



radiatim costatd ; margine dentato. 

 Hab. ad oras Americse Centralis. (Real Llejos.) 

 Found on rocks at low water. — G. B. S. 



Mouretia reticulata. Mour. testd subdepresso-conicd, subro- 



tundatd, sitperne reticulatd, albd. 

 Hab. ad Valparaiso. 



Found attached to shells in deep water, from forty-five to ninety 

 fathoms. — G. B. S. 



Genus Siphonaria. 



SiPHONARiA cosTATA. Siph. tcstd depressd, fusco-nigricante, co- 

 stis albicantibus, radiantibus, superne obtusis ; margine sinuoso . 

 long. I So, lat. 1'05 poll. 

 Hab. ad oras Americse Centralis. (Guacomayo.) 

 On rocks in exposed situations at low water. — G. B. S. 



Siphonaria radiata. Siph. testd subdepresso-conicd, fusco-nigri- 

 cante, costis albicantibus, radiantibus ; margine crenato : long. 0'9, 

 lat. 075 poll. 

 Hab. ad littora Occidentalia Africae. (Gambia.) 

 This differs from Siph. costatd rather by its form than by anj"^ 

 other character ; this being only a slightly depressed cone, while the 

 last is altogether very flat. — G. B. S. 



Siphonaria lineolata. Siph. testd oblique conicd, fused, lineo- 

 lis numerosis, albidis, radiantibus : long. 065, lat. 45 poll. 



Hab. ad Paytam Peruviac. 



Variat testd majore, lineis albidis minits conspicuis : long. 105, lat. 

 0-8 poll. 



Hab. ad Insulam Chiloe Chilensium. 



On rocks in exposed situations. — G. B. S. 



Siphonaria Pica. Siph. testd suboblique conicd, nigricante, radia- 

 tim costatd et striatd, costis albidis; margine crenato, interne albo 

 maculato : long. 0'8, lat. 01 poll. 



Hab. ad Acapulco. 



On rocks in exposed situations. — G. B. S. 



V Siphonaria subrugosa. Siph. testd subdepresso-conicd, fusce- 

 scente, extiis albicante, radiatim costato-striatd, rugulosd ; vertice 

 subcentrali, nigro : long. 0"8, lat. 0*6 poll. 



