228 F. Stoliczka — Notes on Terrestrial Mollnsca. [No. 3, 



smaller than the adjoining ; it is obtusely pointed, with a small 

 einargination on either side. The following teeth are gradually 

 more oblique, but the base retains its subquadrangular shape ; the 

 inner large hook decreases and the outer small pointed one in- 

 creases in size, until they become nearly equal. The one or two 

 outermost teeth appear to be shortly tricuspid. The basal portion 

 of the teeth is in all elongately subquadrangular, above very 

 slightly emarginate on the central tooth, but becoming gradually 

 more so on the laterals, while at the same time the width slightly 

 and the length considerably decrease, until on the last teeth the 

 upper ends are very distinctly bifurcate. The formula of the teeth 

 is 22 (to 18) + 20 — 1 — 20 + (18 to) 22, there being 77 to 88 

 teeth in each transverse series. The first 20 teeth on either side 

 of the central tooth are somewhat larger than the following, but the 

 passage from the larger to the smaller ones is very gradual, and 

 not always distinctly traceable. 



Trachia gabata, Gould. 



Helix gabata, Gould, 1844, Bost. Journ., vol, iv, p. 454, pi. xxiv, fig. 9 ; — 

 eadem Cliem., Pfeiff., Reeve, &c. 



Hanley and Theob., Conch. Indica, pi. xiv, fig. 7, non If. gabata, ibidem 

 fig. 4 = H. procumbens, Gould. 



H. Merguiensis , Phil., 1846 ; eadem Peiffer, et auctorum. 



Plectotropis gabata, apud Wall., Proc. Z. Soc, 1865, p. 408. 



The specific distinctions pointed out by Philippi between his 

 Merguiensis and Gould's gabata, and relied on by subsequent 

 authors, do not exist in reality. Both forms are covered with a 

 hairy cuticle, but, when the hairs are broken off, a finely gra- 

 nular, or rather punctate or scrobiculate, surface is produced, which 

 generally can be easily detected, if not on the whole, at least on some 

 portions, of the shell. Rarely are the hairs so much worn down, 

 that the surface attains the appearance of being quite smooth. 



Shells which have the upper side quite flat, resembling the one 

 figured by Gould, would seem to be of extreme rarity. I have 

 not seen any full grown ones equal to it, but specimens with a 

 slight upper convexity, like those delineated by Chemnitz and 

 Reeve, are of common occurrence. The upper convexity of the shell 

 is indeed subject to considerable variation. Some specimens have 



