47 



ventrali subprominuld ; omninh radiatim sulcatd et concentrice 

 striatd, striis antice sublamellosis denticulatis : long. 1*3, lat. 0'6, 

 alt. 0*6 poll. 



Hub. ad Paytam Peruviae. 



Found in hard clay and stones at low water,— G. B. S. 



Var. abbreviata. Testa breviore, striis sublamellosis denticulatis 



nullis : long. I'l, lat. 0'6, alt. 0'6 poll. 

 Hub. ad Insulam Platae. 

 Found in stones at low water. — G. B. S. 



Petkicola rugosa. Pet. testd oblongd, pholadiformi, albicante ; 

 radiatim costellatd, tenuissime concentrice striata; marginibus 

 plerumque deformibus : long. 1*4, lat. 0"55, alt. 0'7 poll. 



Hab. ad oras Chilenses. (Conception.) 



Found in Balani?ii from three to seven fathoms depth. — G.B. S. 



Petricola tenuis. Pet. testd oblongd, pholadiformi, tenui, al- 

 bicante ; radiatim costellatd, costellis anticis posticisque fortio' 

 ribus, omnibus striis exilissimis rugulosis decussatis; latere antico 

 brevissimo : long. 1', lat. 0*5, alt. 55 poll. 



Hab. ad littora Peruviae, (Lambeyeque & Pacosmayo,) 



Found in hard clay at low water. — G, B. S. 



Petricola robcsta. Pet. testd rotundato-subtrigond, subgibbosd, 

 solidiusculd, extHs rufescente-fuscd, intHs nigricante; radiatim 

 costatd, costis anticis tenuioribus confertioribus, posticis altio- 

 ribus ; interstitiis omnibus exilissime decussatim striatis; latere 

 antico rotundato, postico subacuminato ; margins dorsali declivi : 

 long. 1-2, lat. 0-8, alt. 0-9 poll. 



Hab. ad Panamam et ad Insulam Muerte dictara. 



Found in rocks at the depth of from six to eleven fathoms, — G. B. S. 



Petricola amygdalina. Pet. testd tenui, subhyalind, Jlavescente, 

 obovatd, Icevi ; latere antico brevissimo, angustiore ; postico Ion- 

 giore, altiore, lamellis nonnullis elevatis distantibus omato : 

 long. 1-3, lat. 0-5, alt. 0-8 poll. 



Hab. ad Insulas Gallapagos. 



Found in Mother. of -Pearl Shells in from three to six fathoms at 

 Lord Hood's Island.— G,B.S, 



The following " Description of a new Genus of Gasteropoda, by 

 W.J, Broderip, Esq,, Vice President of the Geological and Zoological 

 Societies, F.R.S., &c." was read. 



Scutella. 



Testa Ancyliformis, intils nitens. Apex posticus, medius, invo- 

 lutus. Impressiones musculares duee, oblongo-ovatae, laterales, 

 Apertura magna, ovata. 



Animal marinum. 



This genus appears to be intermediate between Ancylus and Patella, 

 while the aspect of the back sometimes reminds the observer of Navi- 

 cella or Crepidula, Lam, Its place will most probably be among 

 the Cyclobranches of Cuvier. 



