THE NAUTILUS. 



39 



straighter on the basal line. Three specimens were obtained, one 

 adult, which is probably a male, and two young shells. The latter 

 are very different from young gracills^ having the epidermis well 

 projected around the border of the shell, and the outlines of the 

 adult state. 



To help commemorate the memory of one who has given nearly 

 a life work towards perfecting the history of the humble clam, I 

 name this in honor of Clias. T. Simpson of the National Museum. 

 Types in my own collection. 



