202 



THE CHICAGO ACADEMY OF SCIENCES. 



tive orifice on the right side, behind and below the eye-pedun- 

 cle. Other orifices as described in the genus. 



Length, 59.00; width, 10.00 mill. 



yaw: Arched, ends blunt or slightly rounded; cutting 

 edge with a rounded median projection; anterior surface 

 covered with both transverse and vertical lines. The jaw is 

 very thick (Fig. 46, J). 



Radula formula: 3 f + +!+ + (56-1-56); central 

 tooth with a very long and narrow base of attachment, some- 

 what widening at the lower extremity and with parallel lines 



Radula of PHILOMYCUS CAROLINENSIS Binney. (Original.) c, cen- 

 tral tooth; 1, first lateral; 12, twelfth lateral; 24, twenty-fourth marginal; 

 25, twenty-fifth marginal; 35, thirty-fifth marginal; J, jaw. 



of reinforcement on the lower portion; reflection about one- 

 fourth to one-third the length of the base of attachment, with 

 a short, stout cusp which bears a blunt cutting point; lateral 

 teeth of same type, but asymmetrical, the reflection and cut- 

 ting point longer, and the superior border with a peculiar tri- 

 lobed form; the outer laterals have a single small, rather sharp 

 outer cusp; marginal teeth a modification of the laterals, the 



