Genus Mouretia. 



MouRETiA Peruviaka. Mout. testci subdepresso-conicd, albd, ra- 



diatim striatd ; vertice centrali ; epidermide corned, tenui, 

 Hab. 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 Americae Centralis. (Real Liejos.) 

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



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



tundatd, superne 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. testd depressd, fusco-nigricante, co- 

 stis albicantibus, radiantibus, superne obtusis ; margine sinuoso • 

 long. \'^o, lat. \' 05 poli. 

 Hab. ad oras Americae 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. O' 75 poli. 

 Hab. ad littora Occidentalia Africae. (Gambia.) 

 This difFers from Siph. costata rather by its form than by any 

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

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



Siphonaria lineolata. Siph. testd obliqu£ conicd, fuscd, lineo- 

 lis numerosis, albidis, radiantibus : long. O' 65, lat. 0'45 poli. 



Hab. ad Paytam Peruvise. 



Variat testd majore, lineis albidis miniis conspicuis : long. l'Oo, lat. 

 0-8 poli. 



Hab. ad Insulam Chiloe Chilensium. 



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



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

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

 maculato : long. 0"8, lat. 1 poli. 



Hab. ad Acapulco. 



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



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

 scente, extus albicante, radiatim costato-striatd, rugulosu ; vertice 

 subcentrali, nigro : long. 08, lat. 0'6 poli. 



