THE NAUTILUS. 135 



A NEW SUBGENUS OF COKALLIOPHAGA. 



BY W. H. DALL. 



Oryctomya n. .-nibg. 



Shell with the form of Coralliophaga, the surface with radiating 

 very fine lines of minute granulations as in Eueharis; hinge with 

 one slender, transverse, more or less trin'd cardinal in each valve, 

 that in the left valve larger, and a slender almost linear tooth on 

 the anterior lower surface of the nymph in each valve; an obscure 

 projection on the cardinal margin in front of the cardinal in the left 

 valve; no lateral teeth; pallial sinus short, angular, the adductor 

 scars large and strong, the inner margins of the valves plain. Type 

 C. (0.) claibornensis Dall. 



This subgenus differs from Coralliophaga in its surface and den- 

 tition, and has the pallial sinus more distinct and angular. It has 

 the boring habit, the valves are therefore often irregular, the younger 

 ones are thinner, more regular, and with the adductor scars less 

 evident. Coralliophaga prima Harris (Bull. Pal. IX, p. 60, pi. 13, 

 figs. 4, 5, 1897), from the Lignitic, may be congeneric, but I have 

 seen no specimens, and the dentition is different according to the 

 description. 



C. (Oryctomya) claibornensis Dall. 



Shell elongate oval with low beaks, quite anterior, moderately 

 inflated, somewhat mesially impressed ; surface with incremental 

 lines which in senile specimens sometimes become lamellose near the 

 posterior end ; radial sculpture of rows of small globular granules 

 easily worn off and almost microscopic; ends rounded, the posterior 

 broader ; hinge teeth delicate, somewhat pedunculate and slender in 

 the adult; pallial sinus uot extending in front of the posterior ad- 

 ductor scar ; pallial line in senile specimens radially striated. 



Lou. 36, alt. 19, diam. 14 mm. 



Claiborne sands, at Claiborne, Ala., Burns. 



This species is readily recognized by its peculiar surface. It will 

 be illustrated in a publication now in press. 



NOTES AND NEWS. 



How CAN HE CLEAN 'EM ? A collector asks " How can I get 

 the livers out of my shells? Is there an acid that will eat liver and 



