CREPIDULA.— Plate II. 



This fine new species is of pure white substance, marked 

 on one side with a single dark ray, which, seen through 

 the outer coat, has a milky appearance. Towards the mar- 

 gin the shell is developed in irregular fimbriated layers. 



Species 12. (Mus. Cuming.) 



Crepidula addnca. Crep. testa ovatd, lateraliter pilei- 

 formi, apice prodncto, conspicue adunco, Uvido-fuscd, 

 extiis epidermide indiitd ; appendice interna, parviua- 

 ruld, alba. 



The hooked Crepidula. Shell ovate, laterally cap- 



shaped, apex produced, conspicuously hooked, livid- 

 brown, covered outwardly with an epidermis ; inter- 

 nal appendage rather small, white. 

 SowEEBY, Tankerville Catalogue, App. p. 7. 

 Crepidula solida. Hinds. 

 Garnotia solida, Gray. 

 Crepidula rodriformia, Gould. 

 Crepidula uncata, Meiike. 

 Hab. Panama. 



Of a livid-brown colour, with a rather small white sep- 

 tum, chiefly remarkable on account of the prominent 

 hooked development of the ape.x. 



