1. C(ELODON ct:vt,anicus. 



Pandora ceyUuncu, 8l)y. P. Z. S. 1835, p. 94 ; Sp. Conch, f. 20, 

 21, 22, = P. cei/lonica. Haul. Rec. Shells, p. 50,=:P. indica, Clieuu, 

 Man. Conch, ii. p. .^4. f. 214. 



Ct.planata, rostrata, securiformi ; ventraliter maxinip, aniicc. 



satis excurvata ; margine postico dorsali valde incvrvato : 



wtns,iKdva dextra, margine postico rectangxdatim svperstante, 



dentibus anficis li. pradonyis, satis exta/itibus, iisijue ad cica- 



tricem addiictoris contirmis, dent em cavernosum vaivce alteriits 



amplectantibus ; dente postico curtiore, extante, fossnm carii- 



lugineam per tot am longitudinem yerente : valoa sinistra, mur- 



gine postico snhrectangulatim superstante ; sulco postico 



denteni v. alt. recipiente ; dentibus anticis usque ad cicatricem 



adductoris continuis, centrali longiore, plusquam dimidio inter- 



stitii lamina fenui tecto, ventraliter arcuato. 



Under this species, of which the correct locality appears in the 



name, Mr. Sowerby quotes "a single specimen obtained at Island 



Muerte, W. Columbia, 11 fm., by Mr. Cuming." The hinge may 



not have been examined. The shell quoted does not now appear in 



the Cumingian collection, and probably belonged to Ciidiophora 



claviculata, which in shape resembles the typical Coelodon. 



1 a. CcELODON cuMiNGir, Hani. {Pandora c), P. Z. S. 1861, 

 p. 272. 



This agrees with the last species in shape and dentition, and is 

 probably only a variety. 



Hub. Philippines {Cuming). 



2. CcELODON DELiCATULUs, A. Ad. (Pandora d.) P. Z. S. (diagn. 

 auct.). 



. . . marginibvs dorsalibus ad angulvm circ. 1G0° divergentibus : 



cardine i». dextr. dente postico satis elongato ; centrali curto, 



ad umbonem valde calloso ; antico longissimo, cicatricem ant. 



siiperante, margini contiguo : v. sinistr. dente centrali curto, 



supra cavernam evecto, in anticum p>>'<Elongum continuo. 



In this species, the shape of which is not unlike P. obtusa, though 



less transverse, the anterior teeth are enormously developed at the 



expense of the central. These are short, but prominent ; in the left 



valve bent over, along the whole length, to form the roof of the 



chamber, and then drawn on into the anterior tooth. 



3. CcELODON ELONGATUS, n. S. 



C. t. parva, tenvissima, maxiine planata ; parte antica minore, 

 excurvata ; ventraliter valde excurvata, postice maxime elon- 

 gata, rostra angustiore ; dorsaliter valde in curvata : intus, v. 

 dextr. dente post, satis longo ; d. centrali prcelongo, postice 

 flecto, cicatricem adductoris pariim, superante ; d. antico tni~ 

 nore : v. sinistr, cartilagine valde elunguta, postice sita ; d. 

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