1. C(ELODON CEYLANTCUS. 



Pandora ceylanica, Sby. P. Z. S. 1835, p. 94 ; Sp. Concli. f. 20, 

 21, 22, = P. ceylonica, Hani. Rec. Shells, p. 50, = P. indica, Chenu, 

 Man. Conch, ii. p. 54. f. 214. 



C. t. planata, rostrata, securiformi ; ventraliter maxime, antica 



satis excurvata ; margine postico dorsali valde incurvato : 



intus,valva dextra, margine postico rectanvulatim superstante, 



dentibus anticis ii. prcelongis, satis extantibus, usque ad cica- 



tricem adductoris continuis, dentem cavernosum vaivce altering 



amplectantibus ; dente postico curtiore, extante, fossam carii- 



lagineam per totam longitudinem gerente : vaioa sinistra, mar- 



gine postico subrectangulatim superstante ; sulco postico 



dentem v. alt. recipiente ; dentibus anticis usque ad cicatncem 



adductoris continuis, centrali lonffiore, plus quam dimidio inter- 



stitii lamina tenui 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 Clidioyhora 



claviculata, which in shape resembles the typical Cwlodoii. 



1 a. CCELODON CUMINGII, 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. 



Hob. Philippines (Cuming). 



2. CCELODON DELICATULUS, A. Ad. (Pandora d.) P. Z. S. (diagn. 

 auct.). 



. . marginibus dorsalibus ad angulum circ. 160 diver gentibus : 



cardine v. dextr. dente postico satis elongato ; centrali curto, 



ad umbonem valde calloso ; antico longissimo, cicatricem ant. 



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



supra cavernam evecto, in anticum pralongum 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, tenuissima, maxime planata ; parte antica minore, 

 excurvata ; ventraliter valde excurvata, postice jnaxime elon- 

 gata, rostro angustiore ; dorsaliter valde incurvata : intus, v. 

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

 flectOy cicatricem adductoris parum superante ; d. antico mi- 

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

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