GUDE ; SPECIES OF PLECTOPYLIS. 



15 



aperture ; a second, shorter, horizontal fold occurs below this one, 

 rising close to the lower extremity of the vertical plate, proceeding 

 horizontally at first, and then ascending a little; another very thin 

 fold rises below the vertical plate, running parallel to the lower suture 

 as far as the aperture, where it unites with the ridge. Palatal folds, 

 five : the first rather long and thin, near to and parallel with the 

 suture, with a deep indentation near the posterior extremity, dividing 

 it into two unequal parts ; the second, horizontal, a little deflected 

 posteriorly, with an elongated denticle posteriorly, and a second, 

 smaller, one above the first ; the third fold much shorter, strongly 

 curved downwards posteriorly, with a minute denticle posteriorly ; the 

 fourth fold vertical with an obliquely descending ridge posteriorly 

 at the upper extremity, and bifurcated at the lower extremity, the 

 anterior arm of the bifurcated the shorter ; a minute denticle occurs 

 near the ridge at the upper extremity and a second one near the 

 middle, both on the posterior side ; the fifth fold is thin, horizontal, 

 and strongly deflected on both sides. — Major diameter, 15 milli- 

 metres; minor diameter, 12 millimetres; altitude, 5 millimetres. 



Habitat, Thayet-Mayo, Pegu, Burma. — Type in my collection. 



Two specimens of an undescribed Pledopylis have been obligingly 

 placed in my hands by Miss Linter, at whose request I name it after 

 her friend, Mrs. Lumley Perrier. In contour this new species 

 resembles Plectopylis peranta, but the shell is much larger. The 



Fig. 10. — Pledo2)ylis pcrricrac, Gudf. 



parietal armature further connects it with the species named, but the 

 palatal armature is more like that of P. leiophis. The two specimens 

 of the new species are stated by Miss Linter to be from Thayet-Mayo, 

 Pegu, Burma ; a third specimen, which is in Miss Linter's collection, 



