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Show 1874.] NEW SPECIES OF HELICID.E. 613 ** One additional, shorter. 11. pseudophis, W . Blf. M S . S. Pegu. 12. pcrarcta\, W . Blf. S. Ava, Burmah. Group B. Parietal or palatal barriers compound. a. Parietal vertical lamina only compound, and palatal plica; simple. a. Horizontal parietal lamina present. * Very short. 13. brachyplecta\%, Bs. D. S. Burmah. ** One additional. 14. feddeni, W . Blf. S. Pegu. Prome. h. Palatal vertical plicas 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 ; portion of the last whorl removed. 1 a. Direct side view; outer side of whorl and palatal plicte removed. 2, 2 a. Plectopylis plectostoma, Bs., similar diagrams 3, 3 a, 3 b, and 3 c. P. shiroiensis, 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. munipurensis, G.-A. PLATE LXXIV. Fig. 6, 6 a. P. achatina, Gray. 7. P. feddeni, W . Blf. 8, 8 a. P. brachyplecta, Bs. 9. P. andersoni, W . Blf. Fig. 1. Plectopylis pinacis, Bs. 2. P. leiophis, Bs. 3, 3«. P. pseudophis, W . Blf., MS. 4, 4 a. P. perarcta, W . Blf. 5, 5 a. P. karenorum, W . Blf. 10. P. cyclaspis, Bs.: .r, the parietal plication, removed to show the palatal plicae. Note - T h e 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. munipurensis is aberrant. . . § 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. |