GUDE : SPECIKS OF PLECTOPVLIS. 



posterior one the longest, vertical, and a little flexuous, giving off a 

 short, obliquely raised ridge posteriorly above, and a short, strong, 

 obliquely deflexed ridge posteriorly below ; the anterior one oblique, 

 the upper extremity converging towards the posterior plate, where it 

 gives off posteriorly a short, strong ridge, and anteriorly a strong, 

 longer ridge, which becomes attenuated ; at the lower extremity it 

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

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

 revolving as far as the aperture, 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 deflexed 

 anteriorly above and posteriorly below. Posteriorly 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 extremity, the fifth near the middle, and the 

 sixth a little below the lower extremity of the vertical fold. — Major 

 diameter, 22*5-25 millimetres; minor diameter, i8"5-2i millimetres; 

 axis, 8 millimetres. 



Habitat, Burma. ^Type in my collection. 



Fig. 7. — Plectopylis magna, GuDE. 



With a miscellaneous collection of Plectopylis, from Burma, kindly 

 sent to me by Miss Linter, Arragon Close, Twickenham, were two 



