MOLLUSCAN GENUS COCHLITOMA. 259 



The radula (text-fig. 6) has the formula : — 



f 71. 1. 71. X143. 



fj 78. 1. 78. xl23. 



The median tooth is short-cusped and much wider than that 

 of var. obesa. The first admedian has a stout but rather low 

 mesocone, a fairly well-developed ectocone, and only the faintest 

 trace of an entocone. It is probable, though not quite certain, 

 that it is less well-developed than in var. obesa. The basal plate 

 is uniformly less deep than in the latter, broader and more 

 rectangular. Very little difference can be noticed in the ad- 

 laterals. A curious abnormality was to be observed in f . 

 Commencing at the sixteenth transverse row, a short series of 

 about three rows of teeth is dwarfed and crowded closely together. 



Text-figure 6. 



Cochlitoma zebra \ax.fulgurata. 

 Radula; median and admedian teeth. 



The pharynx. — Four main pharyngeal retractors pass through 

 the subcerebral orifice and spread out in a broad fan- shaped 

 fascia which, as in var. obesa, has a semi-lunar insertion on the 

 postero-ventral surface of the pharynx. There is a short oeso- 

 phagus which passes insensibly into the crop. Internally a 

 greater complication of the internal longitudinal folds, a greater 

 frequency of transverse ridges, and a greater general thickness 

 enables us to assume that the crop starts about 10 mm. from the 

 pharynx. Measured from this point the crops of i x and f 2 are 

 39 + 3 and 26 + 3 mm. in length respectively. 



The salivary glands (text-figs. 7 &, 8) differ extensively in 

 f t and f 2 . In general they correspond to those described above. 

 The crop passes into the anterior part of the stomach, in f, 

 abruptly, in f 2 gradually. The stomach exhibits considerable 

 differences in f T and f 2 . Thus in f ; the shape is piriform and 

 in f 2 irregular. But there is no character which differentiates 

 these forms from var. obesa. 



The relation between the anterior and posterior parts of the 

 stomach (or stomach and caecum) has not been commented upon 

 at any length save in a general way by Wiegmann (1898). The 

 stomach as a whole is bent on itself, and the apex of the bend is 



