AGARDHIA. 145 



only by Nevill's lengthy work, here reproduced. He wasted 

 much ink and good white paper over a small matter. 



Subvar. obesa Nevill. "Whorls 8%, a little more convex 

 and more rapidly increasing, the last longer, scarcely com- 

 pressed at base ; aperture more ample, less contracted below, 

 the columellar margin straighter. Length 5, diam. 1% mm.' 7 



(Nevill). 



Evidently this is what Nevill referred to as "var. tumida" 

 in his remarks on bourguignatiana, since that name does not 

 occur elsewhere in his paper. 



Var. plagiostoma Nevill. Plate 17, figs. 12, 13, 14. 



" (An potius Pupa plagiostoma n. sp.?) 



"This is a well-marked and very distinct form, distinguish- 

 able at a glance by the characters of the aperture which ap- 

 pear to be constant. It was bv no means rare in deposits 

 B and C. 



"Spire slightly convex, less gradually tapering (or tur- 

 reted) ; whorls 8 1 /-), the first 3%, increasing rapidly, the 

 others of almost equal breadth, the last one longer in pro- 

 portion, more compressed at its base, so much so that it has 

 a subcarinate appearance round the umbilicus. Striation a 

 little more distinct and more oblique. Aperture quite differ- 

 ently shaped, not triangular, but more compressed, narrowly 

 oblong, as broad at its base as above, both columellar and 

 parietal folds more twisted, the former less straightly trans- 

 verse; the two palatal ones, seen through from the back, 

 appear more callous and to run into one another ; in the type 

 form they appear to run more or less parallel. The peristome 

 even more callously thickened, with its margins joined by a 

 more developed callosity; the columellar margin has a very 

 slight bend at its commencement, otherwise it is quite 

 straightly oblique, without the characteristic deflection of P. 

 bourguignaticma; the callous tubercular tooth on the outer 

 margin equally prominently and robustly developed ; this 

 tooth appears to be peculiar in the group to the Menton 

 species, in which it exists in every specimen and in all the 

 varieties, the other species merely possessing a slight thicken- 

 ing in its place, as far as I know. Long. 4 1 /?, diam. I14 mm," 

 (Nevill). 



Subvar. angusta Nevill. "This is a by no means rare form, 

 which has decided me on not specifically separating the pre- 

 ceding. It has a similar aperture, as also a coarser striation, 



