140 Prof. E. Forbes on Fossil Invertebrata from Southern India. 



Shell very inequilateral, yet equally rounded at both ends, gaping at the extre- 

 mities ; the surface marked with regular distant furrows. It belongs to a group 

 of PanopacB very difficult to define specifically, ranging through many strata, pro- 

 bably from the palseozoic rocks upwards into the tertiaries, but chiefly concen- 

 trated and most numerous in the lower cretaceous beds. Panop(Ba plicata and 

 some other lower greensand species are nearly allied to this Indian form, which 

 however I cannot satisfactorily unite with any of them. 



Locality, Pondicherry (and Verdachellum). 



Genus Pholadomya, Sowerby. 

 1. Pholadomya connectans, sp. nov. PL XVII. fig. 5, 



P. testa transverse ovata, inaequilaterali, extremitatibus rotundatis (subhiantibus) concentrice 

 sulcata, in medio longitudinaliter decemcostata, costis radiantibus. 



Length 0|| inch. Breadth l/g inch. Thickness Oy^^ inch. Length from beak to farthest 

 extremity l^V inch, 



A well-marked and handsome species, most nearly allied to the Pholadomya 

 ovalis of the upper oolite, and to the P. parvula of the oolite of Hanover. It con- 

 nects such forms with Pholadomya Martini of the lower greensand. 



Locality, Pondicherry. 



Genus Poromya, Forbes. 



Char. Gen. Testa plus minusve globulosa, aequivalvis, postice paululiim producta, tenuis, 

 punctata. Cardo in valvula dextra dente cardinali valido, laterali nullo ; in valvula sinistra 

 dente cardinaU obsoleto, fovea ligamentali oblonga. Umbones antice retorti. Impressiones 

 muscular es duae. Sinus palliaris parvus. 



The position of this very natural and well-marked genus, indicated in my Report 

 on the Invertebrata of the ^gean, is between Corbula and Necera; and when the 

 animal shall have been examined, it will most probably be found closely resembling 

 that of the last-named genus. The existing species of Poromya are two ; one, 

 nearly allied to the first of the fossil forms here described, inhabits the Chinese 

 seas, and was described by Mr. Hinds under Mr. Sowerby's name of Necera hyalina. 

 I have examined the specimens of this beautiful shell in Mr. Cuming's unri- 

 valled collection. The second Poromya anatinoides was found by myself in the 

 eastern Mediterranean, where it lives only in very great depths. It is not so 

 near the Indian fossil species as the first, but is very closely aUied, indeed possibly 

 identical, with a species found fossil in the English and Belgian crags, and described 



