142 University of Michigan 



PLATE XIII 



The hair-line represents a length of one centimeter; the dimensions of 

 the shells figured are given in the text. 



Fig. a. Tudora megacheilos megacheilos. Male and female, from C5c. 



Fig. B. Tudora megacheilos, form desculpta. Male and female 

 (type), from C5c. 



Fig. C. Tudora megacheilos spreitensis. Male and female (type), 

 from G8. 



Fig. D. Tudora megacheilos rondeMipensis. Male and female (t.'V'pe), 

 from CI2a. The male is turned so as to show best the palatal emargiua- 

 tion of the peristome in T. megacheilos. 



Fig. E. Tudora megacheilos Icahrieten.sis. Male (type) and female, 

 from C3. 



Fig. F. Tudora pilsbryi. Male and female (type), from C2a. The 

 male is turned so as to show best the palatal sinus of the peristome in 

 this species. 



Fig. G. Tudora fossor fossor. Male (type) and female, from CblTb. 

 The type retains all of the whorls. 



Fig. H. Tudora fossor westpuntensis. Male (type) and female, 

 from G18. 



Fig. I. Tudora fossor canashitensis. Male (type) and female, from 

 A4b. The dimensions given in the text were taken when the type retained 

 all of the whorls, but a bit of the apex crumbled away before the figure 

 was made. 



Fig. K. Tudora fossor arubana. Two males and a female (type), 

 from A2b. One male (the left-hand figure) has the spiral sculpture very 

 much reduced; the other is turned so as to show best the slight palatal 

 emargination of the peristome, which is usually greater in arubana than 

 in the other subspecies of T. fossor. 



