26 E>DODO>'TID.i:. 



J>. 'JVo transrerse parietal plates. 



a. Shell flattened, no fold below umbilical angula- 



tiou, umbilicus still narrower. Habitat, Cejlon. caliyitiosa. 



b. Shell conoid, with a double fringe of curved 



hairs ; a horizontal fold below umbilical angu- 

 lation : umbilicus still narrower. Narrowest 

 of all. Habitat, Ceylon biciliafd. 



44. Ruthvenia retifera. Pfciffer. 



Heli.v retifera. Pfeifler, P. Z. S 1845, p. 73 : Reeve, Conch. Icon, vii, 



1853, pi. 173, tig. 1170 : Hanley & Theobald, Couch. Ind. 1874, 



pi. 87, figs. 8 cS: 9. 

 Helix (P/ecfopr/Iis r) retifera, Nevill, Hand List, i, 1878, p. 70. 

 Helix {Plectopylis) retifera, Trvou, Man. Conch, ser. 2. ill, 1887. 



p. 161, pi. 34, tigs. 63, 64. ■ 

 Plectopylis retifera, Pilsbry, Man. Conch, ser. 2, ix, 1894, p. 146: 



Gude. Science Gossip, x. s. iii, 1897, p. 301, tig. 43 (shell and 



armature). 

 Plectopylis {Si/kesia) retifera, Gude, Science Gossip, N. s. vi, 1899. 



p. 149. 



Original description : — " T. umbilicata, obtuse trochiformi>, 



stiirito-plicatula, lineis nonuullis concentricis elevatis reticulata. 



carinata, diaphana, sericina, pallide cornea; spira ele\ata, obtusa ; 



aiil'r. 6| planiusculi, ultimus basi subplanus, striatus ; umbilicus 



ruediocris, pervius ; apertura dt-pressa, securit'ormis ; perist. 



simplex, acutum, margine supero brevi, basali plane arcuate, 

 " Uiam. niaj. 7, min. 6|, alt. 4 mill." {Pftlffer.) 

 Hah. India: '^Wgw'i^ {Metcalf, Jerdon) ; Xoouoor Ghat {Blan- 



ford, Nevill) ; Tinnevelly Hills {Beddome): Sbevroy Hills (5?««/'i!»'(/); 



Mysore (Parry). 



,# 



Fig. 5. — Euthvciiia retifera. 



The parietal armature consists of a single, strong, vertical plate, 

 sligbtly sinuate, but not notched, giving off a slight support 

 anteriorly a little below the uppi-r extremity (see fig. 5 c, 

 wliicli shows both the parietal and palatal armatures from the 

 posterior side). The palatal armature — as in all the members 

 of the group — is distinctly visible through the shell-wall, 

 and consists of two series of denticles, the upper series being 

 composed of : posteriorly, a strong, short, vertical flattened tooth, 

 and, anteriorly, a minute, horizontally elongated denticle, in a 

 line with the base of the posterior tooth ; the lower series is com- 

 posed of : posteriorly, a smaller, flattened, A'ertical tooth, aiid 



