170 CEETACEOUS PELECYPODA 



I have not seen any of the original specimens referred by d'Orbigny to 

 tliis species in his '' Pal. fran9aise," but I saw others fully as short and hif^h 

 as the one figured by Goldfuss. His figure shows the lunular edge very pro- 

 minent ; some specimens approach to it in this respect, but I have not seen any 

 with an equally strongly projecting lunula. Some of our specimens also perfectly 

 correspond with the two photographs given by Gueranger. The form figured by 

 Eeuss (in Bohm. Kreidef., pi. xli, fig. 14) has the anterior side very much pro- 

 duced, and if the outline of the posterior end is correct, I would think that it 

 hardly could belong to the present species. Our specimens are certainly undistin- 

 guishable by arty prominent character from those occurring at Blackdown from 

 which Sower by obtained his originals: both exhibit the same amount of vari- 

 ations as already stated. 



Localities. — North of Alundanap coram and north of Kunanore, in a yellowish 

 brown conglomeratic sandstone. 



Formation. — ? Trichinopoly group, but very close to the boundary of the 

 Arrialoor, with which the mineralogical character of the rock corresponds ratheir 

 better than with that of the former. In Europe the shell appears to be charac-. 

 teristic of the Upper Greensand and Senonien (Plsener) beds of the continent. 



/ 2. Cytherea Garudana, Stoliczha, PL VI, Pigs. 17-19. 



Cyth. testa regulariter ohlonga^ sub-incequilaterali, crassiuscitla, ad utramque 

 terminationem sub-rotundata^ compressiuscula imprimis in senioribus speciminibus ;_ 

 superficie striis concentricis prope marginem exteriorem crassioribtis, ac sulcis latius- 

 C'ldis notata ; umbonibus acutis, paiilo incurvis, declivitatihus superioribus sub- 

 rectis, antica paululum concava, postica convexiuscida ; dentibus cardinis sicut in 

 Gyth. plana dispositis ; lunula angusta long a ^ linea impressa circumscripta, 



Lengtli of largest specimen ... ... ... . , . 45 m. m. 



Height : lengtli... ... ... ... ... 070 -0-74 



Thickness : height ... ... ... ... 0*40 -0-46 



Shell nearly regularly oval, rounded anteriorly and posteriorly, with the beaks 

 somewhat prominent and incurved towards the anterior end ; the surface is covered 

 with striae of growth only, these being stronger near the margins and partially 

 alternating with broadish shallow sulci ; the lunule is very long, narrow, cordiform, 

 along its central line somewhat sharply elevated, and all round margined by a fine 

 groove. The hinge does not differ in any essential way from that of Cytli, plana, 

 except that the lunular tooth of the left valve is proportionately somewhat stronger, 

 though the corresponding cavity of the left is not peculiarly deep and not marked 

 by such strongly elevated edges as in the former species ; the cardinal teeth of the 

 right valve are all more or less distinctly bifid. The pallial sinus has not been 

 observed. The oval and compressed form readily distinguish this from the former 

 species, and also from Cyth. Archiaciana, to which it appears still more related^ 



Locality. — ComarapoUiam, in a greyish sandstone. 



'Formation. — Arrialoor group. 



