PLECTOPYLIS. 



123 



off two short, strong ridges, one posteriorly and one anteriorly ; 

 below these plates occurs a thin told, close to the lower suture, 

 revolving as far as the apertui-e, where it unites with the flexuous 

 ridge. Palatal folds 5 ; the three upper horizontal ; the first 

 straight and having an elongated denticle below it at about the 

 middle ; the second a little deflected posteriorly ; the third short, 

 crescent-shaped; the fourth vertical, flexuous; the fifth horizontal, 

 abruptly deflected anteriorly above and posteriorly below. Poste- 

 riorly between the first and fifth folds occur six denticles, placed 

 vertically in a row, the first in a line with the elongated denticle 

 below the first fold, the second a little above and the third a little 

 below the second fold, the fourth in a line with the upper 

 exti'emity, the fifth near the middle, and the sixth a little below 

 the lower extremity of the vertical fold. 



"Major diam. 22-5-25, minor 18-5-21 ; alt. 8 mm." {Gnde.) 



Hah. Burma : Taunghu, Pegu. 



Fig. 60. — I'lcdopt/Hs magna. 



Like the last species, the present form was based upon material 

 sent to me by the late Miss Linter and found among a miscel- 

 laneous collection of Phctoijylis from Burma. A shell in the 

 possession of Mr. E. R. Sykes, labelled P. acJiatina, was also 

 referred to this species. Subsequently I discovered two specimens 

 in the late W. T. Blanford's collection, labelled " Taunghu, Pegu ; 

 H. P. Blanford." I have also seen two specimens collected by 

 Theobald, which are now^ in the possession of Mason's College, 

 Birmingham, and which were labelled P. rej>ercussa ; the latter 

 measure respectively : 23*5, 19'5, 9 mm. and 25, 20, 9 mm. 



Plectojyi/Us mac/na differs from P. ponsonbi/iin being much larger, 

 more solid, and darker in colour, in having one whorl more, in the 



