146 University of Michigan 



PLATE XV 



Eacli scale indicates a length of one millimeter, except in fig. 55, where 

 it represents 200 microns (.2 mm.). 



Fig. 54. Guppya molengraaffi. Apical, basal and profile views of the 

 type, from Cb20. 



Fig. 55. Thysanophora crinita arubana. Profile view of hair and de- 

 tail of sculpture on 3rd whorl of a young shell from A4a. 



Fig. 56. Thysanophora crinita arubana. Apical, basal and profile 

 views of the type, from A4a. 



Fig. 57. Thysanophora vanattai. Apical, basal and profile views of 

 the type, from A4a. 



