OP SOTJTHEEN INDIA. 379 



4. MoDiOLA FLAGELLiFERA, Fovhes, PL XXIV, Pigs. 1-2. 



1846, Mytilus (Modiolus) flagelliferus, Forbes, Trans. Geol. Soc, Lond., vii, p. 152, pi. xvi, fig. 9. 



1850. Idem, d'Ork, Prodrome, II, p. 247. 



1865. Modiolajlagellifera, Forb., Zittel, Denkscb. Akad., Wien, xxv, pt. ii, p. 82, pi. xii, fig. 2, (cum synom). 



Mod, testa elongata, soleniformi, suh-arcuata, antice rotundate obtusa, postice 

 paulo dilatata et ad terminationem oblique sub-rotundata, sub-compressa, umbonibus 

 anticis, sub-terminaUbus, depressis, maf^gine dorsali et ventralifere parallelis ; super- 

 ficie costulis incrementi flagellatis, antice et prope marginem ventralem multo tenui- 

 oribus^ orfiata, 



A peculiar solenoid form, which attains a length of nearly 120 m. m. It is 

 moderately inflated, becoming more compressed, and at the same time very 

 gradually higher posteriorly. The ribs are numerous, thick, more or less sub- 

 divided along the most elevated diagonal region of each valve, but on the ventral 

 side they become thinner and are sometimes almost obsolete. Young specimens 

 have comparatively very thin and flattened valves. When the shell surface is 

 very well preserved, it shows a minute punctuation or granulation, which indicates 

 the presence of a slightly rough epidermis in the fresh shell. 



Matheron appears to have figured (in 1842) a fragment of this species under 

 the name of Inoceramus siliqua from the Dept. of the Rhone. Zittel identified 

 the Gosau form with our Indian, and Bosquet apparently quotes it fromLimburg 

 under the name Modiola fiagellifera, var. angusta, fvalvis minoribus, et angmti- 

 oribus^ Bosquet, Possil fauna et flora van het Krijt v. Limburg in Staring's 

 Bodem v. Nederland, IP® deel). 



Thus the species appears to have a large geographical distribution. It belongs 

 to a type which is eminently characteristic of the mesozoic age, and all the species 

 are extremely like each other. I would particularly draw attention to the species 

 described in the above-quoted volume of the London Transactions (p. 193, pi. xxii, 

 figs. 2-3,) from so-called Jurassic rocks of Sotith Africa as M, Bainii, Sharpe. 

 This species only differs from the Indian shell by very fine transverse stri^ near 

 the anterior half of the ventral edge ; they are not to be observed on the two 

 specimens of ^a^^W^/er^ which I have examined, and Zittel does not notice them 

 in European specimens. 



Locality, — Pondicherry, in a bluish grey sandstone ; apparently rare. We 

 have no specimens of the species in our collections ; the figures I have given are 

 taken from a young shell with open valves and two fragments of a large specimen, 

 the anterior half being the original of Porbes. 



Formation, — Valudayoor (PArrialoor) group. 



5. MoDiOLA (Beachydontes) badiatula, Stoliczha, PI. XXIII, Pigs. 4, 6, 7. 



Mod, testa elongato ovata, paulo arcuata^ antice angusta, dorsaliter et postice 

 T)alde dilatata^ ad terminationem sub-rotundata^ regione ventrali rapide declivi et ad 

 medium insinuata; umbonibus terminalibus^ depressis; superficie, in junioribus 



4 z 



