432 CEETAOEOIJS PELECYPODA 



3. Pectbn Vbrdachellbnsis, Forbes, PI. XXXI, Pigs. 13* — 14,* PI. XLII, 



Pigs. 7-8. 



1846. Pecten VerdacJiellensis, Forbes, Trans., Geol. Soc, Lond., vii, p. 154, pi. xiv, fig. 5 — idem auctorum. 



Pect, testa sub-orhiculari seu orbiculato ovata^ cequivalvi^ valvis lente convexius- 

 cutis, costulis et striis radiantihus, tenuibus, confertissimis, squamose spinulosis, ornatis, 

 in valva dextra frequentioribus quctm in sinistra ; auriculis sub-cequalibus, radiatim 

 costutatis, 



A very densely radiately costulated, sub-orbicular species^ the ribs being un- 

 equal, often sub-diyided and covered with very numerous, fine, spinulose scales ; they 

 are generally on the right valve more numerous and often also thinner than on the 

 left one ; the concentric striae are only at certain distances somewhat better marked. 



Localities. — Ootatoor, Puravoy, Moraviatoor, in brownish earthy limestone. 



Formation. — Ootatoor group. 



4. Pecten Arcotensis, Stoliczka, PL XXXI, Pigs. 18—19. 



Pect, testa ovato-orbiculata, antice paululum dilatata, mquivalvi, valvis costulis 

 radiantibus crassulis, simplicibus, interdum minoribus indistinctis alternantibus, et 

 concentrice striis acutis, confertis, in costulis squamulosis, ornata ; auriculis anticis 

 paululum majoribus, radiatim costellatis, posticis minoribus, obliquis. 



This differs from the previous species by its comparatively much stronger 

 costulation and slightly more oblique shape. 



Locality. — Stripermatur, in a ferruginous conglomeratic sandstone. 

 Formation. — Arrialoor group. 



5. Pecten [Chlamys] asperulinus, Stoliczka, PL XXXI, Pigs. 10—11, 



PL XLIV, Pig. 5. 



Pecten testa sub-orbiculari, cequilaterali, valvis modice et fere cequaliter paululum 

 convexiusculis, radiatim 11-15 costatis, costis latis, sulcis profundis angustissimis sepa- 

 ratis, medio maxime elevatis, tuberculis squamosis aut sub-spinosis ornatis, in utraque 

 declivitate 3-4- costutatis, costulis incequalibus, confertissime squamulosis, costula prima 

 ad cristam medianam sita tenuissima, secunda fortiore, tertia tenui aut obsoleta 

 quarta, seu infima, fortissima ; auriculis sub-cequalibus, modicis, radiatim costutatis, 

 truncatis, antica valvce dextrce ad basin emarginata. 



This species may be said to represent the common European Pecten asper 

 in India ; it is very closely allied to it, but the lateral ribs on the slope of each large 

 rib are somewhat different. In asper the one next to the median tuberculated 

 crest is the strongest, or it is separated from it by only a very thin rib ; in aspe- 

 ruli/nus the last rib adjoining the median furrow is the strongest. The scales are 

 on the secondary ribs of the Indian species very thin, and numerously crispate. 



* In these figures the radiating rihs are a little too strongly marked; they should be thinner and more unequal • 

 their character is well shown in the enlarged view (fig. 14 h) of a portion of well preserved surface. 



