1. C(EL0DON CEYLANICUS. 



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

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

 I.Ian. Couch, ii. p. 54. f. 214. 



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

 satis excurvata ; margine postico dnrsali valde incvrvato .- 

 intus, valva dextra, margine postico rectanaulatim superstante, 

 dentibus anticis ii. prcelonyis, satis extantibus, usque nd cica- 

 tricem adductoris continuis, dentem cavernosum valvte alterius 

 amplectantibus ; dente postico curtiore, extante, fossam carii- 

 lagineam per totam longitudinem gerente : valva sinistra, mar- 

 gine postico subrectaitgulatim superstante ; sulco postico 

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

 adductoris continuis, centrali longiore, 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 

 jMuerte, W. Columbia, 1 1 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 ChUioplwra 

 claviculata, which in shape resembles the typical Coslodon. 



la. Coslodon cumingiIj 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. 



Hab. Philippines {Cuming). 



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



BUCt.). 



. . .marginibus dorsalibus ad angulum circ. 160° divergentibus : 



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 tlie 



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, U. S. 



C. t. parva, tenuissima, maxime planata ; parte antica minore, 

 excurvata ; ventraliter valde excurvata, postice maxime elon- 

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

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



flecto, cicatricem adductoris parvm svperante ; d. antico mi- 

 nore : V. sinistr. cartilagine valde eluiiyutu, postice sita ; d. 

 229 



