FAMILY 6. LITHOPHAGA. 69 



We confess that there are few instances on record in which a natu- 

 ralist has been honoured by the introduction of his name into the nomen- 

 clature of genera, but in this instance we trust it will be allowed to 

 remain ; the indefatigable zeal which has been displayed by Mr. Cuming 

 in collecting Mollusca, both amongst the dangerous islands of the Pacific 

 and on the lofty mountains of the Philippines, fully entitle him to such a 

 distinction. 



Examples. 

 PI. XLIX. Fig. 1. 

 Cumingia mutica, Sowerby, Proceedings Zool. Soc, 1833, p. 34. 



PL XLIX. Fig. 2. 

 Cumingia trigonularis, Sowerby, Proceedings Zool. Soc, 1833, p. 34. 



PI. XLIX. Fig. 3. 

 Cumingia lamellosa, Sowerby, Proceedings Zool. Soc, 1833, p. 34. 



PI. XLIX. Fig. 4. 

 Cumingia coarctata, Sowerby, Proceedings Zool. Soc, 1833, p. 35. 



Family 6. LITHOPHAGA. 



Testa suboblonga, latere antico plus minusve hiante. Ligamentum ex- 

 ternum. Animal terebrans, nee tubo nee partibus testaceis acces- 

 soriis instructum. 



This family was instituted by Lamarck, for the purpose of associating 

 a small group of terebrating Tropiopoda, which, although inhabiting hard 

 calcareous rocks, differ from the Tubicola and Pholadaria, not only in the 

 growth of their shells, but in the absence of any testaceous tube or acces- 

 sory pieces. 



In addition to the two genera now included in this family, a third was 



