THE NAUTILUS. 57 



teeth of the different transverse rows are not precisely alike. 

 Both forms, however, show very distinctly the inner angular 

 projection of the first laterals, which is (probably in error?) 

 omitted from Strebel's figures of A. stenurus and A. berendti, 

 and also from Semper 's figure of A. brasiliensis. The figures 

 of stenurus and brasiliensis do indeed show an inner angle, 

 but from its position it is evidently neither an angle or endo- 

 conal point. On comparison with A. guatemalensis Crosse 

 & Fischer the shell in our slugs is seen to be narrower than 

 the figure in Miss. Sci. Mex. (1878) pi. 9, f. 2; and the lateral 

 teeth have a well-marked endocoue, whereas the figure in Miss. 

 Sci. Mex., pi. 9, f. 4, shows none. Much has been made of the 

 inner tooth of the inner laterals, but I suspect that some of 

 the published figures may be faulty, since when the focus is 

 not exactly right it cannot always be seen. Von Ihering's 

 figures of the teeth of A. brasiliensis show the inner tooth very 

 well, and differ from Semper 's figures of the same species. 



It is at present somewhat uncertain whether the Antigua 

 and Quirigua slugs represent different species or subspecies; 

 but since they occupy entirely different life-zones, and present 

 some tangible structural differences, it seems probable that 

 they should be given different names. A. guatemalensis is 

 said to be 15-18 mm. long, bluish-black, the mantle darker, 

 the sole pale ; central tooth plainly tricuspidate. This might 

 well apply to the Antigua slug, allowing for the usual varia- 

 tion. The teeth of guatemalensis were 35-14-1-14-35, which is 

 sufficiently near the formula of the Antigua slug. The local- 

 ity of guatemalensis is Totonicapan, where it was obtained by 

 Bocourt. This, like Antigua, is in the midst of the mountain 

 country, and may be expected to have a similar fauna. All 

 things considered, then, I believe I am justified in calling the 

 Antigua specimen A. guatemalensis Crosse & Fischer, 1870. 

 The Quirigua slug, from the tropical lowlands of the Motagua 

 Valley, may for the present be known as A. guatemalensis 

 motaguensis n. subsp. 



I will take the opportunity to note that Taylor (op. cit., 

 p. 126) is surely in error when he refers my A. Iccvis maculatus 

 to A. lavis lacustris (Bonelli). The marginal teeth of 



