PANDORA.— Plate III. 



Species 20. (Fig. a, b, Mus. Brit.) 



Pandora claviculata. Pan. testa altd, dolahriformi, 

 arcuata, solidiusaild, concentrice valide vndulatd ; 

 latere antico elevato, margine dorsali subalato ; 

 latere postico ad marrjinem ventralem rotundatim 

 expanse, verms terminum sursum acclivi ; margine 

 dorsali arcuato, rosfro . terminali acclivi ; costis 

 rostralibus crassis, ad terminum elevaiis ; valvd 

 sinistrd postice moderate convexd, Jlexuosd. 



The key-shaped Pandora. Shell elevated, hatchet- 

 shaped, rather solid, concentrically strongly un- 

 dulated ; anterior side raised, dorsal margin 

 slightly alate ; posterior side roundly expanded at 

 the ventral margin ; sloped up towards the end ; 

 dorsal margin arched, terminal rostrum sloped 

 upwards ; rostral ribs thick, raised at the end ; 

 left valve posteriorly moderately convex, flexuous. 



Carpenter. Proc. Zool. Soc, 1855. 



Hah. ? 



Resembling Pandora Ceylanica in form, but the 

 under valve is more convex, and the curve of the 

 dorsal margin less strong. 



Species 21. (Fig. a, b, Mus. Brit.) 



Pandora depressa. Pan. testd altd, solidd, vivide 

 margaritaced, compressd, breviiisculd ; latere antico 

 Irevissimo ; margine dorsali declivi ; latere postico 

 obtvso, vix rostrato ; margine dorsali leviter 

 arcuato; valvd sinistrd parvd, convexd. 



The depressed Pandora. Shell elevated, solid, brightly 

 pearly, compressed, rather short ; anterior side 

 very short ; dorsal margin sloped ; posterior side 

 obtuse, scarcely beaked ; dorsal margin slightly 

 curved ; left valve a little convex. 



SowERBT. Species Conchyliorum, Figs. 11, 12. 



Pandora tabacea, Gronovius ? 



Species 22. (Mus. Brit.) 



Pandora disccrs. Pan. testd brevi, altd, compressd ; 

 latere antico cuneato, subproducto ; latere postico 

 breviiisculo ; valvd dextrd acute rostratd, costis 

 validis duabiis prope marginem radiatd ; valvd 

 sinistrd nmlto ad marginem ventralem, valvam 

 dextram superanti. 



The discordant Pandora. Shell short, elevated, com- 

 pressed ; anterior side cuneate, a little produced 

 posterior side rather short; right valve sharply 

 beaked, rayed near the margin with two strong 

 ribs ; left valve much overlapping the right valve 

 at the ventral margin. 



SowERBY. Proc. Zool, SoC; 1835. 



Hab. ? 



The ventral extension of the deeper valve, from which 

 the name is probably derived, may possibly be a mere 

 imperfection in the specimens described from. 



Species 23. (Mus. Brit.) 

 Pandora unsuiculus. Pan. testd parvd, arcuatd, 



ventricosd, latere antico subaciiminato ; latere 



postico siihattenuato, rostro producto, acuminata ; 



costis marginalibus duabus, angustis, approximatis ; 



margine dorsali leviter arcuato ; valvd sinistrd 



convexd, siibfleantosd. 

 The talon Pandora. Shell small, curved, ventricose, 



anterior side rather acuminated ; posterior side 



rather attenuated, beak produced, acuminated ; 



marginal ribs two, narrow, approximate ; dorsal 



margin slightly arched ; left valve convex, rather 



flexuous. 

 SowERBY. Species Conchyliorum, figs. IG, 17. 



Hab. ? 



The posterior side is attenuated gradually towards 

 the beak in this species ; whereas in Pandora jlex-uosa 

 it is suddenly contracted. 



