182 CEETACEOUS PELECYPODA 



intus suhtilissime striatis separatis tecta. Cardo dentibus sicut in specie typica 

 instructus, 



Lengtli of largest specimen ,., ... ... ... 25 m. m. 



Height : length .,, ... . .., ... 0*98 - I'OS 



Thickness : height ... ... ... ... 0'30 - 0"32 



This is an almost perfectly orbicular species, very flat and compressed, 

 slightly tumescent at the umbones, which are pointed and strongly incurved, 

 touching each other. The lunula is elongately ovate and very deep ; a separate 

 area can hardly be said to exist, the fulcra supporting the ligament lying in a 

 very narrow fissure with perpendicular sides. The ornamentation is peculiar, the 

 whole surface being covered with sharp concentric sometimes almost laminar thin 

 ribs separated by broader interspaces, which are again very minutely striated. The 

 width of the sulci slightly varies, and they are less conspicuous when the ribs 

 are somewhat undulating. 



Eorbes had figured this species under the name of Art, lenticularis, but in 

 his description he mostly had in view specimens which actually were identical with 

 the European species ; his reference to the recent Art. lincta, Pult., also clearly 

 indicates this. 



Locality. — Ninnyoor, in a white earthy limestone ; rare. 



Formation. — Arrialoor group. 



\/ 3, Eriphyla diversa, Stoliczha, PI. VI, Eig. 6. 



Briph. testa quadrangulariter rotimdata, crassiuscula, concentrice numerosissime 

 et anguste lirata, convexiuscula ; umbonibus valde prominutis, acutis, 2^aulo incurvis ; 

 declivitate lunulare ad marginem profunde ecccavata, areale fere rectiuscula ; lunula 

 et area profundis, prima ovali, altera elongata, postice angustissima. 



Height : length ... ... ... ,,. o-96 



Thickness : height ... .,. ... ... Q'M 



This form greatly resembles in shape the more convex varieties of Mnpli. 

 lenticularis, but the beaks are more prominent and pointed, and the surface is 

 covered with rather strong very close ribs ; one or two deeper sulci being only 

 slightly indicated ; the ornamentation is, however, characteristically different from 

 that of the above-named species. 



io{?afoY«/.— South-east of Vylapaudy ; only a single specimen was found in a 

 greyish somewhat conglomeratic rock. 



Formation. — Arrialoor group. 



