134 Vniversity of Michigan 



PLATE IX 



The scales represent lengths of 50 microns (.05 mm.). 



Fig. 25. Stoastomops walheri. Radula from type locality (B4). 

 Central field and laterals in approximately their relative position; first 

 marginal and blades of 3rd and 7th uncini. 



Fig. 26. Cistulops raveni. Radula from Cll; except the tilted view 

 of the outer lateral which is from C. raveni arubana (A2). Half row, 

 with teeth slightly separated laterally. At the right is shown a lateral 

 view of the central (R), and median views of the inner (1) and outer 

 (2) laterals. 



Fig. 27. Tudora megacheilos. Radula from C5c. Teeth of half row, 

 each in position usually seen. Also, lateral views of inner (1) and outer 

 (2) laterals, and inner profile of marginal (M). 



