28 



ENDODONTIC. 



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. 6 cZ). The palatal armature is in two 

 series, the first (upper) series consisting ot" a posterior vertical 



Fig. 6. — Ruthvenia clathrattdoidcs. 



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, 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. iSix specimens from JMadura, 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 iti 

 immature specimens of R. retifera. 



Wlien describing this species in 1897, I hazarded the opinion 

 that the specimens referred to under Plectopijlis datliratida by 

 Xexill (Hand List, i, 1878, p. 70) as having been collected in 

 .Sikkim by 8tohczka 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 

 8een the species in undoubted Darjeeling collections, such as 

 Jilanford'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 Cevlon. 



4(j. Ruthvenia clathratula, Pfeiffer. 



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



Oonch. Icon, vii, 1852, pi. 65, fig. ^36 ; Pfeiffer, Conch. Cab. 



Ilehceen, iii, 185:^, p. 310, pi. 127, figs. 17-20 ; Hanley & Theobald 



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

 Helix {Plectopylis) clathratula, Nevill, Hand List, i, 1878, p. 70: 



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

 Plectopylis clathratula, Jousseanme, Mem. Soc. Zool. France, vii, 



1894, p. 277. 

 riectopijlis (Austenia) clathratula, Gnde, Science Gossip, n. s. iii. 



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



