109 



The exhibition was resumed of the previously undescribed species 

 of Shells contained in the collection of Mr. Cuming. Those brought 

 on the present evening under the notice of the Society were accom- 

 panied by characters by Mr. G. B. Sowerby. They comprised the 

 following species of the 



Genus Pecten. 



Pecten subnodosus. Pect. testd subaquivalvi, aquilaterali, uu- 

 riculis irKEqualibus ; striis radiantibus numerosissimis, radiisque 

 decern, crassis, rotundatis, alternatim nodosa -vesicularibus vel 

 subnodosis ; intus plerumque purpurea signatd: lang.5'25,lat.2'7o, '- "- 

 alt. 5" poll. 



Variat a, colore rufo-fuscescente, striis albis. Hub. ad Sinum Cali- 

 fornise. 



/3, coloribus subvariegatis pictd seu fused, maculis albis utplurimum 

 notatd. Hab. ad Insulam Platse, Columbia Occidentalis. 



y, testd depressiore, colore aurantiaco nitente. Hab. ad Sinum Te- 

 huantepec, Mexicanorum. 



Found in sandy mud and coral sand in from ten to seventeen 

 fathoms.— G. B. S. 



Pecten magnificus. Pect. testd subaquivalvi, aquilaterali, auri- 

 culis inmqualibus ; striis radiantibus exiguis numerosissimis, radi- 

 isque tredecim, crassiusculis, rotundatis, nonnunquam subnodosis ; 

 intus albd purpurea marginatd : long. 5 5, lat. 2", alt. 5' 5 poll. '' ^ 



Variat a, colore sanguineo nitente. Hab. ad Insulas Gallapagos. 



jo, testd fused, maculis albidis variegatd. Hab. ad Insulam Platse, I?. /7. 

 Columbiae Occidentalis. 



A single specimen of var. a was found in coral sand at a depth of 

 six fathoms : var. /3 was also found in coral sand in seventeen faliioms. 

 — G. B. S. 



Pecten dentatus. Pect. testd valdi inaquivalvi, (cquilaterali, au- 

 riculis aqualibus ; valvd planulatd sulcato-radiatd et striatd, alterd 

 valdi convexd, lavigatd, radiatim sulcatd, tnargine ventrali pro- 

 fundi dentato : long. 3'75, lat. 1'5, alt. Z' 5 poll. 

 Hab. ad Sanctam Elenam. 



Found among sand and stones in twelve fathoms. 

 The flat valve is of a dark brown colour outside, white with a broad 

 dark purple margin within ; it falls deeply into the convex valve, 

 whose margin is deeply cut between the ribs ; this latter valve is of 

 a brownish colour outside, and nearly white within. — G. B. S. 



Pecten tumidus. Pect. testd subincequivalvi, tequilaterali, auriculis 

 magnis, subcequalibus ; valvd alterd turgidd, fusco rufescente al- 

 bidoque variegatd, radiatim IS-costatu, costis superni planulatis, 

 interstitiis transversim striatis, alterd turgidiore, albicante, radi- 

 atim sulcatd, costis interstitialibus latioribus, planulatis, lateribus 



