1874.] NEW SPECIES OF HELICIDjE. 613 



** One additional, shorter. 



11. pseicdophis, W. Blf. MS. S. Pegu. 



12. pcrarcta\, W. Blf. S. Ava, Burmah. 



Group B. Parietal or palatal barriers compound. 



a. Varietal vertical lamina only compound, and palatal plicae simple. 



a. Horizontal parietal lamina present. 



* Very short. 



13. brachyplecta+§, Bs. D. S. Burmah. 



** One additional. 



14. feddeni, W. Blf. S. Pegu. Prome. 



b. Palatal vertical plicae only compound. 



a. Horizontal parietal lamina present. 



* One additional. 



15. shiroiensis, G.-A. S. N.E. frontier, Munipur. 

 ** Two additional. 



17. leiophis, Bs. S. S. Burmah, Pegu. 



17. refuga, Gld. S. S. Burmah, 



18. refuga, var. dextrorsa ? D. S. Burmah. 



c. Both parietal and palatal processes compound. 



a. Horizontal parietal lamina present. 



* Single. 



19. karenorum\, W. Blf. S. Pegu. 



20. cyclaspis, Bs. S., keeled. Tenasserim. S. Burmah. 



** One additional. 



21. achatina. Gray. S. = repercussa, Gld. Tenasserim. 



S. Burmah. 



22. anguina%, Gld. S. S. Burmah. 



EXPLANATION OF THE PLATES. 



Plate LXXIII. 

 Fig. 1. Plectopylis macromphalus, W. Blf., tangential side view seen from the 

 front or side of the aperture ; partion of the last whorl removed. 

 1 a. Direct side view ; outer side of whorl and palatal plica removed. 



2, 2 a. Plectopylis plectostoma, Bs., similar diagrams 



3, 3 a, 3 b, and 3 c. P. shiroie?isis, G.-A. 



4, 4 a. P. nagaensis, G.-A. 



5, 5 a, 5 b, 5 c. P. serica, G.-A. 



6, 6 a, 6 b, 6 c. P. munipurcnsis, G.-A. 



Plate LXXIV. 



Fig. 6, 6 a. P. achatina, Gray. 



7. P. feddeni, W. Blf. 



8, 8 a. P. brachyjylecta, Bs. 



9. P. andersoni, W. Blf. 



Fig. 1. Plectopylis pinacis, Bs. 



2, P. leiophis, Bs. 



3, 3 a. P. pseudophis, W. Blf., MS. 



4, 4 a. P. perarcfa, W. Blf. 



5, 5 a. P. karenorum, W. Blf. 

 10. P. cyclaspis, Bs. : cc, the parietal plication, removed to show the palatal 



plicae. 

 Note.— The horizontal dimensions given in this plate are, in every case, the 

 major diameter of shell, the vertical the breadth of whorl. 



+ In P.perarcta and P. karenorum it is continuous to the aperture, and in P. 

 munipurcnsis is aberrant. 



8 The horizontal parietal lamina in P. anguina extends not quite up to the 

 bar at the aperture, and is very thin ; in P. brachyplecta it only extends to half 

 the distance. 



