142 Prof, E. Forbes on Fossil Invertebrata from Southern India. 



Length from end to end 2^^ inches ; from beak to frontal margin Oyg inch ; from beak to 

 farthest extremity I/3 inch. Thickness of united valves Og''^ inch. 



A cast, with a portion of the shell attached showing the striated surface. The 

 cast is obsoletely sulcated across. The hinge-line is margined and somewhat 

 compressed. 



Locality, Pondicherry. 



Genus Tellina, Linnaeus. 

 1. Tellina? pondicherriensis., sp. nov, PL XVIII. fig. 15. 



T. ? testa transverse striata, ovato-elongata, valde inaequilaterali, extreraitatibus rotundatis, 

 umbonibus acutis. 



Measurement from end to end Oj''^ inch. From beak to frontal margin 0-^^ inch. Thickness 

 of united valves Oj-^ inch. 



The frontal margin is nearly straight. The cast is smooth. 



Locality, Pondicherry. 



Genus Psammobia, Lamarck. 

 1. Psammobia? inconspicua, G. B. Sowerby, MSS. PI. XV. fig. 18. * 



P. testa transverse oblonga, lata, depressa, laevi seu substriata, subinaequilaterali, margine 

 dorsali arcuato. 



Length Oy^^ inch. Breadth ly^^ inch. 



A single valve, not in very good condition, but very distinct from any other shell 

 in the collection, and most probably a species of Psammobia. 

 Locality, Trinchinopoly. 



Genus Mactra, Lamarck. 



1. Mactra tripartita, G. B. Sowerby, MSS. PI. XV. fig. 17. 



M. testa transverse oblonga, subtriangulari, depressiuscula, subaequilaterali, concentrice 

 sulcata, sulcis numerosis confertis, regularibus, lateribus truncatis, apice acuto. 

 Breadth 1 inch. Length Oy% inch. Height 0/(j inch. 



The only species of its genus in the collection. The surface is beautifully 

 grooved by numerous regular close transverse striations, which suddenly become 

 much stronger on the truncated sides. The cast is smooth. 



Locality, Trinchinopoly. 



Genus Lucina, Brugui^re. 

 1. Lucina jugosa, sp. nov. PI. XVII. fig. 7. 



L. testa orbiculari, depressa, concentrice regulariter sulcata, sulcis numerosis (50), margine 

 cardinali acutS. 



Length l-^^^ inch. Breadth Ij^^ inch. Thickness 0^ inch. 



