60 CONTRIBUTIONS 



Observations. The genus Gratelupia was established in 

 1 827, by M. Charles des Moulins, president of the Linnsean 

 Society of Bourdeaux, and published in the second volume 

 of the Transactions of the Society. The name of his dis 

 tinguished friend, Dr Grateloup, was given to the genus, 

 a single species of which only has heretofore been made 

 known, the G. donadformis. I have great pleasure in now 

 having it in my power to dedicate a new species to the 

 founder of the genus, who has cultivated, with such emi 

 nent success, the rich formations of the south of France, 

 and added so much to the labours of Basterot. 



It is not quite so transverse as the donadformis , nor is 

 the basal margin quite so straight it differs also in being 

 gibbous over the umbones and in having comparatively a 

 small excavation of the palleal impression, which, in the 

 other species, is large, extending two-thirds of the distance 

 between the two great muscular impressions. The small 

 additional teeth which distinguish this genus from the 

 Cytherea, are not in this species so perfectly defined as in 

 the donadformis. They are more irregularly cut up into 

 crenulations. M. des Moulins places his genus between 

 the genera Ludna and Donax. The structure of its teeth 

 would induce me to think it ought to be placed before the 

 genus Cytherea. The lateral tooth is like that of the Cy- 

 therea, but more removed. 



The genus Gratelupia has been observed, heretofore, only 

 at Bourdeaux, where a single species has been observed by 

 the founder of the genus in the Miocene. 



