8 University of Michigan 



these species, with the exception of S. gnatcinalcnsis, which is 

 slightly broader (40 per cent). 



Eugla)idina dccussata (Deshayes), near subspecies tcnella 

 (Strebel). Ten specimens, nearly adult, and 21 juvenile speci- 

 mens ; from the ground and the leaves of the trees in the low- 

 land forests (H, i, a and b) ; dead shells from the burnt-over 

 area (H, ii, a) ; from the leaves of trees in the savannah brush 

 (H, iii, b), and one dead specimen quite far from the nearest 

 trees on the savannah grassland (H, iv) ; also from near the 

 Laguna de Catemaco. Tliis species is a rapidly moving form, 

 which appears to cover most of the ground habitats, and goes 

 quite high up into the trees. The juvenile specimens are espe- 

 cially common on the leaves of trees. 



ACHATINID^ 

 Opcas bcckianmn (Pfeiffer) (1846). Seventy adults and 

 some juveniles; mainly from the ground in the lowland jungle 

 (H, i, a), Ijut also from the ground in the savannah brush (H, 

 iii, a) and from near Lake Catemaco. These are quite char- 

 acteristic of the slender Vera Cruz form (cf. Pilsbry, 1906). 

 but have very distinct costulations on the middle whorls and 

 sometimes quite to the aperture. The apex, under magnihca- 

 tion, shows minute, spiral lines in both this species and in O. 

 gracilc. A figure (Figure 6) of the radula is given; the mar- 

 ginals differ from the laterals, mainly in their reduced size. 



Leptinaria martensi (PfeifTer) (1857). One adult and 8 

 younger specimens that are probably this form ; from the 

 ground in the lowland jungles (H, i, a) ; also i young speci- 

 men, from near Lake Catemaco, that is either this form or L. 

 mcxicanum (Pfr.). The columellar fold appears rather 

 variable in these shells, and the vertical costulae are quite well 

 marked. 



