190 MESSES. J. C. MELVILL AKD E. STANDEN ON 



338. Tridacna seeeifeea, Lam. 

 Station 14, Mer. 



339. Teidacna squamosa, Lam. i 

 Station 14, Mer. 



Caediid^. 



340. Caedifm tenuicostatfm, Lam. 

 Station 5, Boydong Cays. 



341. Caedifm (Teachtcaedium) dianthinum*, sp. n. (PI. 11. 

 figs. 25, 25 a.) 



C. testa oblique rotunda, tenui, pallide straminea, ssepe ad 

 medium carneo vel puniceo-suffusa, saepe unicolore, vel straminea 

 vel undique punicea, longitudinaliter costata, costis quinque et 

 triginta, planatis, postice serrulatis, et antice minute squamatis, 

 umbonibus contiguis, parvis, ligamento externo ; intus variante, 

 interdum straminea, interdum carnea, marginibus postice dentatis, 

 superficie interna delicate longitudinaliter lirata. Alt. 14, lat. 

 12, diam. 8 mm. (spec. maj.). 



Station 10, Channel between Hammond Island and Wednesday 

 Spit. 



A yariably coloured, delicate, and bright little shell, its chief 

 peculiarities being the obliquely rounded outline (in one variety 

 somewhat squarely set towards the ventral margin), and the 

 smooth ribs, fine and close, some 35 in number, only ser- 

 rulate posteriorly and in front minutely scaly. Within, the 

 surface varies as do the outer valves in coloration, the delicate 

 ribs showing through, so thin is the substance of the shell. 



Several specimens. 



342. Caedium (Teachtcaedium) ELOis^aATUM, Brug. 



One magnificent example, of narrower contour than the type 

 figured by Eeeve, and which does not possess so many ribs, these 

 being only 38 in number, as against 43 or 44 in normal specimens. 

 The colour too is less vivid, and shows no trace of rufous, being 

 of a pale cinereous-ochre. 



Station 14, Mer. 



343. Caedium (Teachtcaedium) lacunosum, B,ve. 



A variety only, the ribs being but 30 in number, the super- 

 * Bianthinus, resembling a carnation. » 



