PANDORA. 



13 rANDOUA, 



jianite, 



Testa inaquicah-is, inaquilateralis, poslice proilucta, 

 rostrata, tenuis, compj-cssa, alba, iiitiis margariUvea. 

 Impressiones iuuscidares dua, rotwidce. Vulva 

 dextra complanata, unidentata, cartilagine inter 

 castas laminatas radialas Joveato, vinryine postico- 

 dorsali rejlexo. Valca dnistra plusminusve con- 

 vexa, ad marginem ventraLia plerumque valcam 

 dextran siiperans. 



Shell itiequivalve, inequilateral, posteriorly produced, 

 beaked, thin, compressed, white, pearly within. 

 Muscular impressions tw<j, rounded. Eight valve 

 flat, single-toothed, cartilage pitted between two 

 radiating laminated ribs, posterior dorsal margin 

 bent backwards. Left valve more or less convex, 

 generally overlapping the right valve at the ventral 

 margin. 



The subgenus Kennerlia is founded by Mr. Carpenter 

 upon the species Pandora glacialis and another or two, 

 which are said to have an ossicle. This ossicle seems 

 to me to be only a thickening of the sides of the liga- 

 ment pit ; in which case, the generic description of 

 Pandora by Adams as hav'ng "no free ossicle" would 

 be correct of all the species including the al>ove 

 mentioned. It is quite possible that an examination of 

 more specimens might modify my view of this mutter. 



The Pandorae burrow in s;ind and mud at con- 

 siderable, but varying depths. Britain has two species ; 

 other species arc found northwards at Spitzbergen, 

 centrally at Panama, and southwards at New Zealand. 

 The number of species has not very largely increased 

 since the publication of the late Mr. G. B. Sowerby's 

 monograjih in the Species Conchyliorum ; that is to 

 say, it has not done so in proportion to many other 

 genera during that period. 



Species 1. (Mus. Brit.) 



Pandor.'I CRlSTjiTA. Fa7i. testa altd, hrevi, dolabnj'ormi 

 compressd ; margine ventrali convcxissimd ; latere 

 antico Irevi, margine dorsali elevato ; laminis 

 cuneatis cristato ; latere postico ad mai-ginem 

 dorsalein leviter arcuato, in rostmm prodticium 

 elevatum angustum terminanti, costu dorsali 

 angustd, tumidd. 



The crested PAXDOR.'i. Shell elevated, short, hatchet- 

 shaped, compressed ; ventral margin very convex ; 



anteriur side short, dorsal margin elevated, crested 

 with cunoate laniiu;e ; posterior side slightly 

 arched at the dorsal margin; terminating in a 

 produced, raised, narrow beak ; dorsal rib nurrow, 

 tumid. 



C.\RrEXTEr. ? Mus. Brit. MS. 



Hal). I 



Distinguished by a jagged crest on the antero dorsal 

 margin. 



Species 2. (Fig. a, h, Mus. Sowerby.) 



P.\NDoi:.\ iNyE(iUiv.\Lvis. Pan. testd obloiigd, intus 

 extdsque medio et versds umbones Jiavidd ; latere 

 antico bred, subrotnndo, versiis medium sub- 

 Jli'xuoso ; latere postico producto, margine dorsali 

 pmd!) arcuatim depresso ; roslro obtuso, truncatu ; 

 costd dorsali dnplicatd. diprcssd; vahd sinistra 

 pivfiindd, JlexUdfi). ml inaiyiiiun vcntralcia valvaiu 

 dexlram conspicn,'- aujicraiili. 



The INEQUIVALVE P.\.\-Dui:.4.. Shell oblong, yellow 

 inside and outside in the middle and towards the 

 umboes ; anterior side short, rather rounded, 

 rather flexuous towards the middle ; posterior side 

 produced, dorsal margin a little depressed with a 

 curve; beak obtuse, truncated ; dorsal rib duplicate, 

 depressed ; left valve deep, flexuous, conspicuously 

 overlapping the right valve at the ventral margin. 



LlKNJlus (Tellina). Syst. Nat. 



Pandora rostrata, Lamarck. 



Ilab. Great Britain. 



Species 3. (Fig. a, b, Mus. Brit.) 

 P.^NDOR.'V Wardiana. Pan. testd altd, semiorbicidari, 

 subntgosd, pallidisshne subjmrpured ; latere antico 

 brevi, angusto, ad marginem ventralem siiiu flexuoso 

 emarginato ; latere postico acuminata expanso, 

 margine dorsali Jlexuosim declivi ; valvd dexlrd 

 complanatd, stdcls incisis rubris, linearibus, 

 divaricatim radiatd ; valvd sinistrd valde convexd, 

 antice sidcAJlexuosd, leviter depressd radiatd. 

 Ward's Pandora. Shell elevated, semiorbicular, 

 rather rough, very pale purplish ; anterior side 

 short, narrow, emarginated at the ventral margin 

 with a flexuous sinus ; posterior side acuminated, 

 expanded, with dorsal margin flexuously sloped ; 

 right valve flattened, diversely rayed with incise. 



November, 187-1. 



