102 HELICIMC. 



attenuated and indented near the posterior extremity ; fifthly, a 

 crescent-shaped, sub-vertical fold (the concave side being towards 

 the aperture and the lower suture), with a small denticle near its 

 posterior extremity ; and sixthly, a longer curved horizontal fold, 

 having its upper edge reflected towards the fifth fold, aiid 

 possessing a small denticle near its posterior extremity. 



94. Plectopylis refuga, Gould. 



Helix refuga, Gould, Proc. Boston Soc. Nat. Hist, ii, 1846, p. 99. 

 Helix (Gorilla) rufuga, Gould, Otia Conch. 1862, p. 198. 

 Plectopylis refuga, Blanford, British Burma Gazetteer, i, 1879, 



p. 709 ; Gude, Science Gossip, N. s. v, 1898, p. 15, fig. 75 (shell 



and armature). 

 Plectopylis (Chersaecia) refuga, Gude, op. cit. vi, 1899, p. 148. 



Original description : " Testa sinistrorsa, discoidea, supra plana, 

 infra concava, viridi-cornea : anfr. arete volutis, confertim 

 striatis, ultimo prope aperturam deflexo ; sutura impressa ; apertura 

 perobliqua, subcordiforini, peristomate albo, reflexo, callo sinuoso 

 connexo ; fauce lamella alba, flexuosa, ad anfractum penultimum 

 volvente. 



" Diam. f [=15-25 mm.] ; alt. 4- pall. [=5 mm.]." (Gould.) 



Hob. Burma: Tavoy (Gould) ; Tenasserim, Pegu (Blanford). 



Plectopylis refuga has long been confused with P. leiophis and 

 the two were by most authors regarded as identical. This con- 

 fusion arose from the fact that the figures, purporting to represent 

 the former, given by Philippi, Pfeiffer, and Heeve, were based on 

 the specimens in the Cumin g collection, now in the British 

 Museum, and, as 1 have already stated when discussing P. leiophis, 

 wrongly identified as P. refuga by Reeve and Pfeiffer, as careful 

 comparison with Benson's types has proved to me. The short 

 description given of the species by Gould might apply equally well 

 to several distinct shells and is insufficient to enable us to 

 determine which form he had before him. 



The type specimens of this and two other species of Plectopylis 

 described by Gould repercussa and anguina being in the 

 possession of the New York State Museum, I requested the loan 

 of them in 1898, but the Trustees decided not to let the specimens 

 go out of the country. Dr. Merrill, the Director of the Museum, 

 however, very obligingly had the shells photographed and their 

 armature sketched for me, and these were reproduced in ' Science 

 Gossip ' at the time, the same figures doing service on the present 

 occasion. Dr. Bagg, Dr. Merrill's assistant, kindly communicated 

 the following notes concerning P. refuga : 



" Helix refuga, Gould, catalogue number, 271 ; original number, 

 A, 562. Two earliest volutions smooth, remainder of shell very 

 finely striated and hairy. Outer volution on lower side angular. 

 Greater diameter nearly | inch [=19 mm.]; smaller diameter, 

 T 9 ^ inch [=14 mm.] ; alt. -f% inch [=4 mm.]; length of horizontal 



