31 MEI.VII.I. AND STANDF.N : MARINE MOI.I.USCA OF MADRAS. 



the present authors,'^' We should be inclined to estimate the probable 

 total of both Madras and Bombay marine moUusca, severally, as about 

 the same, say, 700 species or so. Both localities possess many 

 points in common. 



An asterisk (*) is appended to all those forms which are included in 

 the Bombay catalogue just alluded to. 



(I). DHSCKIPTIONS OF NEW SPECIES. 



Cerithium carnaticum n. sp. (Plate I., fig. i). 



C. tista attenuaio-fusifonni, solida, sordidc ocJiracea, ititerdum 

 castafieo-variegata ; anfractibus novem, incequaliier varicosts, ad suturas 

 superficialiter canaliculatis, lotigUudinaliier irregulariier cos/at is ; costis 

 rudihus, undiiiue transversim nidi-liratis ; jioidura costarum lirar- 

 uviijtie scT/e gemmulatis ; apertura ovata, labro extiis effuse, paulliim 

 incrassato ; canali brevi. Long. 13, hit. 5 ;//w., sp. mnj. 



It is curious that this Cerithium has not been described ere this, 

 for unnamed examples exist in the British Museum. Its affinities 

 would appear centred near C. adenense Sow. (which, however, is 

 much larger) and its allies. 



It is a rudely-sculptured species, solid, nine-whorled, attenuate, so 

 impressed at the sutures as to appear channelled ; the unequal varices 

 and the irregular longitudinal ribs are crossed by thick lir?e, and at 

 the junction of these shining papillae occur. Mouth ovate, outer lip 

 effuse, a little thickened, canal short. 



Colina selecta n. sp. (Plate I., fig. 2). 



C. testa fusifor»ii,cylifidiica, attenuata, solidiiiscula, ciitereo-hru7inea ; 

 anfractibus utidecim, apud suturas paulliim impressis, uiidique transversim 

 arete sulculosis ; sulcis inipresso-punctatis ; ultitno a?i/rattu producto ; 

 apertura rotunda., labro exteriore effuso, incrassato, intus casfaneo- 

 lineato. Long. 15, lat. 4 fnm. 



Allied to C. pinguis A. Ad., the typical form of which is from the 

 Cape, while varieties occur in various tropical regions, e.g., Lifu and 

 the Paumotu Is. Our species resembles more C. tceniatum Sow., but 

 is not so pupiform in shape, nor is it noduled transversely. After exa- 

 mination of all forms of C. pijiguis and allies, we have come to the 

 conclusion that this is distinct from any. It is an elegant shell, and of 

 marked peculiarity in appearance. 



Rissoina (Morchiella) thaumasia n. sp. (PI. I., fig. 3). 



R. testa fusi/ormi, versus apicem attenuata, solida, ochraceo-alba ; 

 anfractibus novem, turritis, apud suturas pauliuni canaliculatis, septem 

 superioribus profundi- decussatis ; costis longitudinalibus prominentibus, 

 interstitiis quasi-punctatis ; anfractu penultinio et ultimo distinct} trans- 

 versim acutiliratis ; costis loni^itudinalibus fere evanidis ; apertura 

 obliqua ; labro exteriore multum incrassata. Long. 5, lat. i" 50 ;/////. 



1 Mem. Manchester SoCi ^^''^ 4; vjl. 7, p. 17-51, 1893. 



