PLECTOPTLIS. 



79 



80. Plectopylis macromphalus, Blanfonh 



Ileliv {Plectopylis^ macromphalm, Blanford, J. A. S. B. xxxix, 1870, 



p. 17, pi. 3, "tig. 14; Godwiii-Austeu, P. Z. S. 1874, pi. 73, tig. 1 



(armature). 

 Helix macromphulus, Haulev & Theobald, Conch. Ind. 18/4, pi. 80, 



figs. 8-10; Nevill, Hand List, i, 1878, p. 71 ; Try 011, Mau. Conch. 



ser. 2, iii, 1887, p. 160, pi. 34, tigs. 65-68. 

 Plectopylis macromphalus, Pilsbry, ibid, ix, 1894, p. 14(i; Gude, 



Science Gossip, n. s. iv, 1897, p. 10, tig. 46 (armature). 

 Plectopylis {Endothynt) macromphalus, Gude, op. cit. vi, 1809, p. 148. 



Original description: — "Testa siiiistrorsa, late umbilicata, de- 

 pressa, discoidea, tenuiuscula, pallido-eornea, superue plicis areuatis 

 obliquis incrementi et liris spiralibus decussata, ad peripheriam et 

 sabtus fere laevis, striatvda ; striis uonnuUis spiralibus circa um- 

 bilicum aliquando distinguendis ; spira plana; apice vix emergente ; 

 sutura leviter iinpressa. Aufr. 4|-5| planulati, arete voluti ; 

 ultimus vix latior, supra peripheriam sub-angulatus, ad latus atque 

 subtus convexus, antice leviter descendens. Apertura irregulariter 

 lunaris, superne compressa, diagonalis ; peristoma albido-labiatum, 

 parum inerassatum, reflexiusculum, marginibus convergeiitibus, 



b 

 Fig. 29. — Plectopylis macromphaht)<. 



callo tenui junctis, externo supra peripheriam arcuato. Plicatio 

 interna persimilis ei Helids imiacis et //. plectostomatis ; e 

 lamina unica parietal!, verticali et plica tenui longuiscula basali, 

 atque plicis 5 palatalibus : basali tenui simplici, ceteris duplicibus, 

 constaus. 



"Diam. maj. 6|, min. oh, alt. 2| mm." {Blanford.) 

 Hah. Assam: Mairung, Khasi Hills {Godwin- Austen); Dafla 

 Hills {Godwin-Austen); Naga Hills {ChenneJl). 



The parietal armature (see iig. 29 a) consists of a strong vertical 

 plate, which has a minute, slightly elongated, horizontal denticle 

 posteriorly to its lower extremity. The palatal armature is in two 

 series (see fig. 29 b, which shows the inside of the outer wall). 

 The anterior series is composed of four short, broad, flattened, 

 straight horizontal folds. The posterior series consists of six 

 narrow horizontal folds, which are shorter tlian those of the 

 anterior series ; the fourth and fifth are a little obliquely de- 

 pressed posteriorly. The specimen is in Mr. Ponsonby's collec- 

 tion, and measures (5 millimetres in diameter. Two specimens 

 in my collection also measure G millimetres in diameter. 



