Occasional Papers of the Museum of Zoology 67 



plum-color; blotches of broken spiral bands, when present, 

 usually united to form irregular bands parallel to the growth 

 lines; eroded apex and apical plug buff to orange and deep 

 indigo. Growth sculpture of last whorl: hea\'ier, higher and 

 more closely-spaced than in fossor ; whorl distinctly cancellate ; 

 cusps less prominent than in fossor. Whorls: about 31/2 re- 

 tained. Umbilicus : less hidden by peristome than in fossor. 

 Aperture : internally light buff to vivid orange ; broken, spiral 

 bands usually shown. Peristome : less abruptly expanded than 

 in fossor. Other characters as in fossor. 



male 



(tj-pe) 9.8 

 female 13.5 



Measurements 

 Shell Aperture 



aJt. maj.diam. min.diam. alt. diam. 



Operculum Whorls 

 long wide 



65(6.4) 

 62(8.3) 



52(5.1) 

 49(6.6) 



45(4.4) 93(4.1) 32(3.2) 80(2.5) 

 46(6.2) 92(5.7) 34(4.6) 78(3.6) 



3V2 

 4 



C18. Frequent (145 specimens collected). Type lot (see Table VII); 

 these smallest specimens, peculiarly enough, come from a habitat where 

 Cerion uva attains greater than average size. 



C19. Infrequent; imder limestone slabs at the yery edge of the shore 

 cliffs (107 specimens). Slightly larger; bleached and stained with a 

 dark brownish deposit. 



Table VII. Dimensions of Tudor a fossor^o 

 canashit- westpunt- 



djerim- 



40 The upper horizontal row under each heading contains the data for 

 the males; the lower, those for females. 



