28 EXDODONTIDJE. 



between these two species. The parietal armature consists of a 

 simple, strong, vertical plate, which is not notched, and is with- 

 out supports (see fig. 6d). The palatal armature is in two 

 series, the first (upper) series consisting of a posterior vertical 



Fig. Q.Ruthvenia clathratuloides. 



tooth and a minute anterior denticle ; the second (lower) series 

 being composed of a posterior vertical tooth and a small anterior 

 denticle; below the umbilical angulation there is, besides, an 

 elongated horizontal fold, and above the peripheral angulation a 

 small fold (see tig. 6 b, which shows the base of the shell with 

 the palatal armature visible through the shell-wall). The speci- 

 men figured is one of the Anamullay Hills specimens in the late 

 Colonel Beddome's collection. Six specimens from Madura, India, 

 also in that collection, I refer to this new form ; four of these are 

 immature and exhibit two sets of armatures, as is the case in 

 immature specimens of R. retifera. 



When describing this species in 1897, I hazarded the opinion 

 that the specimens referred to under Plectopylis clatliratula by 

 Ne\ill (Hand List, i, 1878, p. 70) as having been collected in 

 Sikkim by Stoliczka might pertain to my species. Lt.-Col. Godwin- 

 Austen, however, rejects this surmise and thinks that there has 

 been some mixing of specimens. He states that he has never 

 seen the species in undoubted Darjeeling collections, such as 

 Blanford's and his own. I am quite prepared to admit the force 

 of this argument, and it is, in fact, extremely improbable that a 

 species should occur in two localities so widely separated and so 

 different faunistically as Sikkim and the southern part of the 

 Indian Peninsula or Ceylon. 



46. Ruthvenia clatliratula, Pfeiffer. 



Helix clatliratula^ Pfeiffer, Zeits. Malak. vii, 1850, p. 67 ; Reeve, 



Conch. Icon, vii, 1852, pi. 65, fig. 336; Pfeiffer, Conch. Cab. 



Heliceen, in, 1853, p. 310, pi. 127, figs, 17-20 ; Hanley & Theobald 



Conch. Ind. 1875, pi. 132, figs. 1-4. 

 Helix (Plectopylis) clatliratula, Nevill, Hand List, i, 1878, p. 70; 



Try on, Man. Conch, ser. 2, iii, 1887, p. 161, pi. 34, figs. 72, 73. 

 Plectopylis clatliratula^ Jousseaume, Mem. Soc. Zool. France, vii, 



1894, p. 277. 

 Plectopylis (Auntenia) clathratula, Gude, Science Gossip, N. s. iii. 



1897, p. 300, fig. 42 (shell and armature). 



