174 CRETACEOUS PELECYPODA 



7. Cytherea [Callista] fabdlina, StoliczJca, PL XVI, Figs. 31-33. 



Ci/ili. testa ovato elonr/ata, inaquilaterale, iimhonihus prominulis, acutimevlis, 

 incurvis ac ajjproximatis instmcta, decUvitate lunulare fere recta, areale convexius- 

 cnla, lunula clongata, antice acuta, llnea impressa marginata, medio elevata ; area 

 angnstissima, paululum profunda; terminatione anteriori rotitnduta, posteriori 

 rotimdate truncata ; margine ventrale iiniforme cttrvato ; valvis moderate convexis 

 m superficie confertissime lirutis, liris crassiusculis, ohtusiusculis, interspatiis pro- 

 fuiid/s, vix angnstiorihus, intersectis. Cardo in valoa dextra dentibus tribus car- 

 dinalibus, longis, tenuibus inslructus, dente postico furcato ; fossa lunulari elongata, 

 angustata ; f uteris tenuibus. 



Length of largest specimen ... ... ... 23 ra. m. 



Height : length ... ... ... ... 072 - 079 



Thicliness : height ... ... ... ... 051 ■ 0-53 



The numerous very distinct and very regular concentric ribs give this shell 

 quite an elegant appearance; it greatly resembles d'Orbigny's V. stib-fava, des- 

 cribed and figured in the Pal. Frangaise under Sowerby's name V. fava, which is, 

 however, a more regularly elliptical shell with finer striation. D'Orbigny's figure 

 also represents a slightly higher shell with a more oblique terminal declivity posteriorly 

 than seen in our Indian form. In this the kmula is oval, pointed in front, elevated 

 m the median line and margined by a deep groove ; the area is very naiTOW and 

 slightly excavated. The hinge-teeth of the right valve are rather elongated, 

 thm, the posterior being distinctly grooved ; the lunular pit is narrow, somewhat 

 elongated, witli a more strongly raised edge below than above ; the fulcra are very 

 thin and situated at the base of the area, but are considerably shorter than this one. 



iocrt^/^/^*.— Garudamungalum, (one specimen), in a bluish calcareous sand- 

 stone full of little shells; east of Odium, (four specimens), in a dark brown calca- 

 reous rock, also with small shells. 



Formations.— Tiichmoiwly and Ootatoor groups. 



8. Cytherea [Callista] laciniata, Stoliczka, PI. VII, Figs. 5-6. 



Ci/th. testa oblonga seu sub-quadrangulare, j^aulo longiori qttam alta, incequi- 

 lateruli, convexiuscula, antice breviter et late- piostice p)aululum atiguste ac oblique 

 truncatim rotundata ; margine ventrali leviter convexiusculo ; vmbonibus jyrominuHs, 

 approximatis, sublcecigatis ; dedicilate lunulare j^recipita, subrecta ; lunula angusta, 

 depressione lineali indistincta marginata; decUvitate areali convexiuscula, area 

 angusta, profunda ; cardo in valva dextra dentibus tribus cardinalibus, medio crassis- 

 simo et dente lunulari elongato instrtictus ; superficie liris crassis, obtusiuscuUs, sulcis 

 angustioribus profundis separatis, notata. 



Lengtli of largest specimen ... ..; ... 20 m. m. 



Height : length ... ... ... ... 078-0-82 



Thickness : height ... ... _ 0'59 - 0'61 



This small species is well characterised by its great height in proportion to its 

 ength, its form being either broadly oval or sub-quadrangular, the beaks are as 



