60 University of 3Iichigan 



C8. Quite abundant (163 specimens collected). Type lot (see 

 Table VI). 



C13. Common (43 specimens). Heavier; a larger proportion of can- 

 cellate specimens. Although Tiidora ftissor djerimensis also occurs in 

 this locality, the two forms show no tendency to intergrade; in fact, the 

 distinguishing characteristics appear to be actually accentuated (see 

 tables VI and VII). 



C9. Infrequent (4 specimens). 



C7ab. Quite abundant (144 specimens). Yery tYpical spreitensis. 



C6a. Very common (110 specimens). Bleached, more depressed and 

 with sculpture weaker. Quite a number of specimens approach form 

 desculpta. 



Cb6b. Frequent (79 specimens). Similar to C6a, but even more 

 bleached. 



Tudora megacheilos rondeklipensis, new subspecies 



Type locality: (C12a) base of northwestern escarpment of 

 Eonde Klip, eastern Curagao. 



Distribution : Curasao ; typical form only from the top and 

 sides of Ronde Klip (C12) ; but the shells along the eastern 

 limestone rim, from south of Sint Joris Baai to north of Campo 

 Hato (CIO, 11), are closer to this subspecies than to the others, 

 although numerous specimens approach form desculpta; nar- 

 rowly invades the region of the older rocks (CblO). Habitat 

 similar to megacheilos. 585 specimens collected. 



Shell (fig. xiii-D) : slightly larger and heavier than mega- 

 cheilos. Color: similar in pattern to megacheilos, but the 

 ground color is brighter and more pronounced, and the bands 

 are usually obscure. Sculpture of last whorl (fig. x-36) : 

 growth cords similar to spreitensis but finer and more com- 

 pressed; spiral sculpture of numerous, prominent and sub- 

 angulate ridges, which are scarcely surmounted by the growth 

 sculpture and without bosses or distinct cusps at the intersec- 

 tions. Earlier whorls: somewhat cancellate, but with the 

 spirals much heavier than the growth sculpture. Umbilicus : 

 more open than in megacJieilos. Peristome : similar to, but 

 more extensively expanded than that of megacheilos; inner 

 callus heavier. Other characters as in megacheilos. 



