DRYM^EUS, MEXICO AND CENTRAL AMERICA. 75 



E.Mexico: Mirador (Sartorius); at one or more of the above- 

 named localities, probably Misantla (Strebel). 



This is identified by von. Martens with B. menibranaceus Phil., 

 with some doubt. I consider that species as more likely to be an 

 Andean form. See vol. xi, p. 237. 



B. emeus var. membranaceus is recorded by J. G. Cooper (Proc. 

 Cal. Acad. 2d ser., p. 166) from the vicinity of Tepee, in western 

 Mexico. This lends some color to the locality given in Monographia 

 vi, p. 57 : " Hab. in provinciis mexicanis pacificis ;" but still I con- 

 sider it improbable that a DrymcBits of the east Mexican lowland 

 should re-appear at Tepee. 



Von Martens gives the following notes on D. emeus: The varia- 

 tions in color are fully described by Strebel ; the ground-color is either 

 white or pale yellow, and there are ordinarily five reddish-brown 

 bands, which are either continuous or interrupted into rows of spots, 

 or also very pale with darker spots. The lower bands are mostly 

 continuous. The uppermost or the two upper bands are absent in 

 several specimens ; if also the third is wanting, we have the variety 

 hypozonus, which, however, is ordinarily of a more ventricose form. 

 Many young specimens show only two lower bands. The two and a 

 half upper whorls are finely cancellated. 



" Strebel states that this species is often found on a shrub culled 

 'huichin,' which bears umbels of 40-50 yellow flowers (capitula?) 

 and belongs to the natural order Composite ; the botanical name of 

 this plant he could not ascertain. Palpalo is the name of a river in 

 the district of Misantla. 



" This species has been greatly misunderstood and confounded with 

 others, no doubt on account of its great variation in color and its 

 peristome being so slightly expanded ; in an artificial system it might 

 quite as well be placed among the species with simple and straight as 

 among those with expanded peristome. From the original descrip- 

 tion, together with the locality indicated, I have no doubt that Say's 

 Bidimus emeus is identical with Strebel's Bidimidus palpaloensis " 

 (Martens). For Bidimus mexicanus of Lamarck, see vol. xi, p. 291. 



D. TRYONI (Fischer & Crosse). PI. 3, fig. 53. 



Shell acuminately ovate, thin, but slightly umbilicated, whorls 6 

 to 7 in number, longitudinally finely striated ; columella reflected, lip 

 thin, simple. Whitish encircled by three or four zones of blackish- 

 brown (JReeve). 



