1. CfKT.nnnx rFVT.Avirrs. 



Pandora ceyUmica, >,U\ . P. Z. S. 1835, p. !;4 , S]). Cmioli. f. 20, 

 21, 2'2, = P. cei//niitru, Haul. llec. Slulls, j». 50, = P. t«t/«ta, Cliemi, 

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



C. t. pla/iafa, rnstrota, securifnnni ; rentraliter maxinip, avfire 



satis excurrnta ; maryine pnstiro dorsali vahle iiici'rrnto : 



infus, vulva dextra, marr/ine postico rectannvlalim fiipprxtante, 



deiifitiis antiiis ii. pra'lni}</i(!, satis extnntihus, asi/iie ad cim- 



tricem addt/ctoris contiiiuis, dentem cavernusum valrce alterius 



atnplectantibiis ; dente postico curtiore, extante, fossam carti- 



lajjineam per totam toiuiifvdineHi yerentp : valca sinistra, mar- 



gine postico subrectaiiyulatim superstante ; sulco postico 



dentem v. alt. recipiente ; dentibus anlicis usque ad. cicufncem 



adductoris contiiiuis, centrali lonyiore, plusquam diiiiidiu inter' 



stitii lamina teiuii tecto, ventraliter arcuato. 



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



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



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



not have been examined. The shell quoted does not now a[)pear in 



the Cumingian collection, and probably belonged to Clidiophora 



claviculaia, which in shajie resembles the typical Coelodon. 



la. CcELODON CUMiNGii, Haul. {Pandora c), P. Z. S. 18G1, 

 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 anyuhnn circ. 160° divergentibus : 



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



ad umbonem valde calloso ; antico longissimo, cicatricem ant. 



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



supra cavernam evecto, in anticum pralongum continuo. 



In this species, the shape of which is not unliloe 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 mto the anterior tooth. 



3. C(ELODON ELONGATUS, n. 8. 



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

 excurvata ; ventraliter valde excurvata, postice maxime elon- 

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

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

 flecto, cicatricem adducfuris pnrum superante ; d, antico tni- 

 nore : V. sinistr, cartHugine valde elvngutu, postice situ ; d. 



229 



