294 



HAAS : ABIDA AND CHONDRINA. 



The smallest specimen measures, length 4, diam. 1.75 mm., 

 having 6 rather coarsely rib-striate whorls. The largest, 

 length 6, diam. 2.5, with iy 2 nearly smooth whorls. 



458 examples from Montserrat contain: 



Comb. 1, 93 spec. Comb. 14, 



3, 7 " " 16, 



5, 1 " " 18, 



6, 24 



7, 11 



11, 7 



12, 23 



11 

 65 

 42 



19, 6 



20, 158 



21, 1 

 24, 6 



spec. 



One of the smallest measures: length 4 mm., diam. 2 mm., 

 having 6 rather distinctly rib-striate whorls. The largest ex- 

 ample measures: length 7 mm., diam. 3.25 mm., having iy 2 

 finely hair-striate whorls. 



Among 231 specimens from Grerona, there were : 



Comb. 



spec. 



Smallest specimen : length 5.5 mm., diam. 2 mm., 614 nearly 

 smooth whorls. Largest: length 7 mm., diam. 3 mm., 8 dis- 

 tinctly hair-striate whorls. The abrupt transition from the 

 relatively few-toothed combination 14 to the 7-toothed com- 

 bination 25, is quite remarkable compared with the preceding 

 lists. 



Still more marked is the absence of such transition in the 

 following case: Castellfollit, Prov. Gerona, 26 examples, as 

 follows : 



Comb 



Smallest, length 5 mm., diam. 2.25 mm., 6y 2 strongly hair- 

 striate whorls. Largest, length 6, diam. 2 mm., 8 lightly rib- 

 striate whorls. 



