PLECTOPYLIS. 145 



chestnut above and at the sides. The specimen figured was received 

 by me as Plectopylis pachystoma, Theobald ; but as I am not aware 

 that this name was ever published I consider it expedient to 

 discard the name altogether. A specimen in the collection of the 



b 



Fig. 76. Plectopylis bensoni, var. venusta. 



late Dr. von Mollendorff, likewise labelled P. pachystoma, I am 

 unable to separate from the present variety, although it shows no 

 flammulation and the peristome is white ; in other respects it is 

 identical. 



Var. breviplica, Gude. 



Plectopylis achatina, var. breviplica, Gude, Science Gossip, N. s. v. 

 1898, p. 134, fig. 87. 



Differs from the type and all the other known varieties by the 

 much more shallow umbilicus. It resembles the variety infra- 

 fasciata in outline, but it is of a uniform dark brown, with a 

 somewhat polished surface, and the last whorl widens more 

 suddenly at the aperture. The basal horizontal parietal fold is 

 very short, not extending on either side beyond the two lower 

 arms of the main median fold ; the first palatal horizontal fold is 

 considerably more elevated than in the other forms, and is bilobed ; 

 the second and third horizontal folds are also more elevated, the 

 latter fold has a short fold above its posterior portion ; the vertical 

 lamina is also more elevated, and in place of the usual denticle 

 posteriorly to its lower extremity is an elevated ridge, quite united 

 to the plate. 



Major diarn. 19, minor 16 inm. ; alt. 7 mm. 



Hab. Burma. 



Plectopylis bensoni, var. breviplica has a much shallower umbilicus, 

 and is thinner and more fragile than any other form of P. bensoni 

 known to me. It is somewhat like the variety infrafasciata, but 

 it is devoid of the white band on the lower side ; the last whorl 

 also widens a little more than in that variety, but is less deflected, 

 and the aperture is more sloping from top to base ; there are also 

 important differences in the armature, the lower horizontal parietal 

 fold being very short, not extending on either side beyond the 



