‘110 . MOLLUSCA.. 
Hab. E. Mexico: Toxpam, on the slope of the Matlaquiahuitl, near Cordova, in 
company with the typical form (Strebel 1+); Jalapa and Cordova (Hége). 
c. bizonata. 
Zonites (Moreletia) bilineatus, var. 8. bizonata, Fisch. & Crosse, loc. cit. p. 168, t. 7. figg. 5,5a”. 
Hab. E. Mexico: no special locality is stated 15, but probably the Specimens were found 
by Sallé at Cordova. 
d. apicalis: fascia nulla, apice fusca, zonula peripherica albida. (Fig. 6.) 
Hab. E. Mextco: Cordova (Hége); Orizaba (Hedlprin }°). 
In the typical form there is a distinct but narrow dark band in the periphery of the 
shell, and a fainter one just at the suture. In) the var. trizonata this upper band is 
very broad, the periphery, and also the third one on the lower face of the shell, like- 
wise broad; the surface between this lower band and the umbilicus is considerably 
paler than the other interspaces. In the var. dézonata the sutural and peripheric 
bands are united into a single very broad one, and the lower band also is very broad, 
so that very little of the yellow ground-colour remains. Compared with the varieties 
of bands in Helix nemoralis and H. hortensis, one might give to the typical form the 
formula 1-3— —, to var. trizonata (1, 2) 3 (4, 5), and to var. bézonata (1, 2) 3 (4, 5); but 
there is this difference, that in H. nemoralis and H. hortensis the uppermost band, 
1, never reaches the suture, as it does in Omphalina bilineata. Strebel’ has also seen 
an example of the form a, subunifasciata, in which the narrow peripheric band is 
divided into two very narrow ones, as is also found, but very rarely, in Helix nemoralis. 
Specimens without bands at all are mentioned by Strebel ; but I have seen only one 
amongst about thirty from different localities. 
7. Omphalina tuxtlensis. 
Zonites tuxtlensis, Crosse & Fisch. in Journ. de Conch. xviii. p. 237 (1870) '; Fisch. & Crosse, 
Miss. Scient. Mex., Mollusca, i. p. 166, t. 7. figg. 6, 6a”. 
Hab. §.E. Mexico: Tuxtla (Sallé 1). 
This shell is said to be distinct from the preceding, not only by the more globose 
form, but by the finer and regular strie. The coloration is the same as in O. bilineata, 
ar. dizonata. Mr. Edgar Smith is inclined to consider it a banded specimen of 
O. zonites. | 
8. Omphalina modesta, sp. n. (Tab. VI. figg. 7, 7 a, b.) 
Zonites (Moreletia) oe var. 6, oe Fisch. & oe Miss. Scient. Mex., 
Mollusca, i. p. 168, t. 7. fig. 5 51. 
Zonyalina bihneata, Form B, Strebel, Beitr. Mex. Land- und Siissw. -Conch. iv. p. 13, t. 2. fig. 14a’. 
