109 



The exliibition waa resumed of tlie previously unde8cribed species 

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

 on the present evening under the notice of the Society "vvere accom- 

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

 following species of the 



Genus Pecten. 



Pecten subnodosus. Pect. testd suh<Equivalvi, <equilaleraU, au- 

 riculis in<equalibus ; striis radiantibus numerosissimis , radiisąue 

 decem, crassis, rotundatis, alternatim nodoso-vesicularibus vel ^ 

 subnodosis ; intus plerumque purpureo signatd: long.5'25,lat.2''7o, 0^v\j 

 alt. 5" poli. 



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

 forniae. 



/3, coloribus subvariegatis pieta seufuscd, maculis albis utplurimum 

 notatd. Hab. ad Insulam Platse, Columbise 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 suhcequivalvi, <Bquilaterali, auri- 

 culis ineEqualibus ; striis radiantibus exiguis numerosissimis, radi- 

 isque tredecim, crassiusculis, rotundatis, nonnunquam subnodosis ; 

 ijitiis albd purpureo marginatd : long. 5"5, lat. 2', alt. 5'5 poli. '' ^ 



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



|3, testd fuscd, maculis albidis variegatd. Hab. ad Insulam Platae, ff. tj^ 

 Columbise Occidentalis. 



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

 six fathoms : var. /3 vvas also found in coral sand in seventeen fatiioms. 

 —G. B. S. 



Pecten dentatus. Pect. testd valdi intequivalvi, eequilaterali, au- 

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

 valdi convexd, leevigatd, 7-adiatim sulcatd, margine ventrali pro- R U. 

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

 Hab. ad Sanctam Elenam. 



Found among sand and stones in twelve fathoms. 

 The flat valve is of a dark brown colour outside, white 'vvith 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 \vithin. — G. B. S. 



Pecten TUMinus. Pect. testd subi7i(equivalvi, mquilaterali, auriculis 

 magnis, suba:quaUbus ; valvd alterd turgidd, fusco rufescente al- 

 bidoque variegatd, radiatim \S-costatd, costis svperni planulatis, 

 interstitiis transversim striatis, alterd turgidiore, albicante, radi- 

 atim sulcatd, costis interstitialibus latioribus, planulatis, lateribus 



