OP SOUTHERN INDIA. 403 



2. PsEUDO-MONOTis [Oxytoma] pallaciosa, StoUczha, PL XXXIII, Pig. 1; 



PL XXXVIII, Pigs. 9-10. 



Pseudo-m. valva dextra sub-orUculata, parte anteriori panlo extensa, depresse con- 

 veximcida, ad marginem fere plana, costulis radiantihus plurihus, antice mtilto tenui- 

 oribus, et striis incrementi confertissimis ornata ; margine cardinali brevi, recto, infra 

 imibonem appendictilo, crasso, lato, dentiformi, projiciente, extra striata, intiis camalicU' 

 lato, instructo, antice in auriculam brevissimam, infra prof unde insinuat am transeunte, 

 Valva sinistra modice C07ivexa, radiatim multicostata, costis siib-granosis seu rtigatis, 

 acutis, fortioribus ac tenuioribus alternantibus ; auricula antica indistincta, ad 

 marginem crassula et leviter insinuata ; car dine infra apicem fovea parva denti 

 antico adjacent e instructo. 



This appears to be a larger species than the foregoing ; it is more dilated an- 

 teriorly than posteriorly, while the reverse is the case in Fs. semi-globosa. The 

 posterior wing is not emarginate, bat there is in the right valve a very deep 

 and narrow incision below the minnte anterior ear, which is intimately connected 

 with a tooth-like, broad appendage below the beak. This appendage has 

 externally a slightly sloping, transversally finely striated face ; behind it is a 

 rather deep, sub-triangnlar depression, apparently for the attachment of the liga- 

 ment ; on the lower side it is deeply canaliculate, posteriorly at the npper end 

 with a round nob, anteriorly with a sharp margin which bounds the byssal incision. 



The left valve is moderately convex, of similar form, but apparently larger. 

 The surface has about ten stronger, somewhat rugose, and an equal or larger number 

 of intermediate thinner, ribs. The anterior ear is indistinct, thickened on the 

 internal margin and slightly emarginated. The hinge (see fig. 9, pi. xxxviii,) has 

 below the beak first a small oblique ligamental groove extending posteriorly, then 

 follows a small pit for the reception of the nob, or the appendage, of the left valve ; 

 next to the pit is a tooth which fits into the lower groove of the appendage, and 

 then follows a slight insinuation of the thickened hinge margin. 



The species closely resembles the European Fseudo-monotis Cormteliana, 

 d'Orb., which is, however, more obliquely produced posteriorly. 



Locality, — Paj ah- Choultry in Stripermatur district, in a conglomeratic 

 sandstone. 



Formation. — Arrialoor group. 



3. PsEuno-MONOTis (?) INOPS, Stoliczha, PL XXXVIII, Pigs. 7-8. 



Fsetido-m. testa sinistra sub-quadrangtilari, tenui inequilaterali, modice convexa 

 antice sub-rotundata, non-conspicue alata, postice oblique truncata, auricula modica 

 ad marginem cardinalem recta, infra terminationem parum emarginata, instructa ; 

 umbone projiciente, obtuso, incurvo ; superficie striis incrementi tenuibus, liris nonnullis 

 crassioribus intersectis, notata. 



Only a few specimens of the right valve have been examined. The general 

 shape, with the almost quite obsolete anterior and moderately elongated, nearly 



5 E 



