246 Mr. W. H. Benson on Plectopylis. 



Farm Caves near Moulmein, enable me to add the characters of 

 the sculpture and colour. 



Testa superne oblique rugoso-plicata, subtus laeviore, umbilicum 

 versus spiraliter striata, superne albida, castaneo-strigata et varie- 

 gata, subtus fusco-castanea, umbilicum versus albida. 



The lamella proceeding from the pylaic parietal plait and 

 the second superior palatal lamina are both visible from the 

 aperture. 



3. Helix Leiophis, B., n. s. 



Testa sinistrorsa, late et profunde umbilicata, subdiscoidea, superne 

 planata, interdum omnino plana, vix solidula, oblique et arcuatim 

 rugoso-striata, lineis nonnullis spiralibus decussata, sub epidermide 

 scabra, fusco-cornea, albida ; spirae apice vix elevatiusculo laevi- 

 gato, sutura impressa ; anfractibus 5| 6^ angustis, ultimo supra 

 peripheriam angulato, antice valde deflexo, basi rotundata, aper- 

 tura valde obliqua subhorizontali, lunari, peristomate reflexo 

 albido, marginibus lamina sinuosa elevata, medio lamellam pro- 

 funde intrantem, usque ad januam attingentem emittente junctis. 

 Janua pliciformi fauciali prim a remota ; lamina 1 parietali vertical! 

 simplici forti lamellam aperturalem valde elongatam superne emit- 

 tente, infra earn lamellis duabus brevibus (a lamina spatio brevi 

 separatis) munita ; plicis 6 palatalibus intrantibus, quinta robus- 

 tiore obliqua. 



Diam. major 11-14, minor 8-11, alt. 3-4^ mill. 



Hab. ad Kwadouk, prope Thyet Mio. 



Distinguished externally from the typical H. refuga, Gould, 

 and its dextrorse variety by its narrower whorls, absence of 

 angulation on the lower side of the last whorl, its more oblique 

 and nearly horizontal aperture, and by the circumstance of no 

 lower lamella being visible from the aperture, as in that variety*. 

 Internally it is distinguished by the shortness and simplicity of 

 the six palatal plaits, and by the obliquity of the fifth, which 

 gives some token of an approach to the palatal lamina of the 

 first section ; also by possessing two short horizontal lamellse, 

 arising near but not touching the upright parietal lamina, in 

 addition to the long lamella which connects that lamina with 

 the aperture, as in Helix Achatina ; whereas H. refuga, var. dex- 

 trorsa has but a single lengthened lamella proceeding from the 

 lower part of the pylaic parietal plait, and the long apertural one 

 is not connected with that plait, taking its rise close to it. 



4. Helix refuga, Gould, var. dextrorsa. 

 Janua pliciformi fauciali prima remota; lamina 1 parietali magna 



* The internal barrier of H. refuga requires examination, and may prove 

 it to be distinct from the supposed dextrorse variety. In the typical shell 

 the lower parietal lamella is said to be invisible from the aperture, and may 

 be altogether wanting. 



