OP SOUTHERX INDIA. 403 



2. PsEUDO-MONOTis [OxYffOMA] FALLACiosA, StoUczka, PL XXXIII, Pig. 1 ; 



PL XXXVIII, Pigs. 9-10. 



Pseiido-m. vaha dextra sub-orhicnlata, parte anteriori paulo extensa, depresse con- 

 rexliiscida, ad marrjinem fere plana, costulis radiantiMs plurihis, antlce midto tenui- 

 orlbits, et striis incrementl confertissbnis ornata; margine caixUnall hrevi, recto, infra 

 mnbonem ap)]}endlciilo, crasso, lata, dentfonni, projiciente, extra striato, intns canalicu- 

 lato, instructo, antice in auriculam brevissimam, infra profunde insinuatam transetmte. 

 Valva sinistra modice convexa, radiatim nmlticostata, costis stib-granosis sen migatis, 

 aciitis, fortioribtis ac tennioribits alternantibus ; aurictila antica indistincta, ad 

 marginem crassula et leviter insimiata ; cardine infra ap'icem fovea parva denti 

 antico adjacente 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 emargiuate, but there is in the right valve a very deep 

 and narrow incision below the minute 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-triangular depression, apparentlv for the attachment of the li^-a- 

 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 lar"-er. 

 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. xxx-^aii,) 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 Pseudo-monotis Cornueliana, 

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



Localitij. — Piajah-Choultry in Stripermatur district, in a couglomcratic 

 sandstone. 



Formation. — Arrialoor group. 



3. Pseudo-monotis (?) inops, Stolicdca, PL XXXVIII, Pigs. 7-8. 



Psendo-m. testa sinistra sub-quadrangidari, tenui inequilaterali, modice convexa, 

 antice sub-rotundata, non-conspicue alata, j}Ostice oblique truncata, auricula modica 

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

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

 crassioribus intersectis, notafa. 



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 p 



