PIIOLAS.— Plate VI. 



plana, epidermUle cra^^sii striatd indnti) ; parte 

 ponticd attenuatd, epidermide laminis Imvigatis 

 rotrnidatis dispositd ; sciite dorsale amplo, expanxo ; 

 inlegv/mentis dorsalihus et ventralibus donijatis. 

 Thk branchiate PnOLAS. Shell pyriforni, closed, 

 anteriorly ventricose, obliquely divided into three 

 parts ; anterior part smooth near the ventral 

 margin ; minutely scabro-striated in the middle 

 and at the back ; middle part flat, covered with a 



thick striated epidermis ; posterior part attenuated, 



the epidermis placed in smooth, rounded lamina ; 



dorsal shield ample expanded, dorsal and ventral 



integuments elongated. 

 Gould, Proc. liost. Soc. Nat. Hist., 184.j. p. 290. 

 //ai. > 



With the exception of the marginal integuments and 

 dorsal shield the characters of this species resemble those 

 of Pholas Calva. 



