OE SOUTHEEX INDIA. 379 



4. MOMOLA FLAGELLiFERA, Fovbes, El. XXIV, Eigs. 1-2. 



1816. Mytihis (Modiolus) flagelliferua, Forbes, Trans. Geol. Soc, Lond., vii, p. 152, pi. xvi, fi". 9. 



1850. Idem, d'Orb., Prodrome, II, p. 217. 



1865. Modiolaflagellifera, Forb., Zittel, Deukscb. Akad., Wien, xxv, pt. ii, p. 82, pi. xii, fie. 2, (cum synom). 



3Iocl. testa elongata, solenifonnl, suh-arctiata, antice rotiuidate ohtusa, jwstice 

 paulo dilatata et ad terminationeni oblique suh-rotundata, suh-compressa, umhonibus 

 anticis, siib-terminaUhns, depressis, murgine dormli et ventrali fere, parallelis ; snper- 

 Jicle costulis increnieiitijlagellatis, antice et prope marginem ventralem mullo tenui- 

 oribus, ornatu. 



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

 moderately iuflated, hecoming 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 jireserved, 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 om' Indian, and Bosquet apparently quotes it from Limbur" 

 under the name Modiola Jlagellifera, var. angnsta, fvalvis miiioribus, et angusti- 

 oribiis, Bosquet, Eossil fauna et flora van het Krijt v. Limburg in Starino-'s 

 Bodem v. Nederland, 11'^" deel). 



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

 to a type which is eminently characteristic of tlie 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. xsii, 

 figs. 2-3,) from so-called Jurassic rocks of Sovith Africa as 31. Bainii, Sharpe. 

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

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

 specimens oi flagellifera which I have examined, and Zittel does not notice them 

 in European specimens. 



LocaUti;. — Eondicherry, in a bluish grey sandstone ; apparently rare. We 

 have no specimens of the species in our collections ; the figures I have "•iven are 

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

 the anterior half being the original of Eorbes. 



Formation. — Valudayoor (? Arrialoor) group. 



5. Modiola (Brachydontes) uadiatula, Stoliczka, El. XXIII, Eigs. 4, 6, 7. 



3Iod. testa elongata ovata, panto arcuata, antice angusta, dorsaliter et postice 

 valde dilatata, ad terminal ionem sub-rotundata, regione ventrali rapide declivi et ad 

 medium insinuata; umbonibus terminaUbus, dejvessis ; siiperjicie, in junioribus 



4 z 



