STROBILOPS, MEXICO, CENTRAL AMERICA. 37 



Moll. terr. et Fluv., I, 1872, p. 267, pi. 12, f. la-h. Not H. 

 streheli Pfeiffer. — Strohila lahyrinthica (in einer hochgewun- 

 denen Form), Strebel, Beitrag etc., IV, 1880, p. 44. 



This is a form which I have not seen, but, since it has been 

 figured by Fischer and Crosse, I introduce it here in order to 

 complete the account of Mexican Strohilops. It appears to 

 differ from 8. veracruzensis by the larger size and the more 

 prominent infraparietal lamella, if we may trust the figure, 

 which is possibly somewhat diagrammatic. Fischer and Crosse 

 state that it differs from lahyrinthica by the spaced instead 

 of close riblets, also they emphasize the perfect visibility of 

 two parietal lamellie, the infraparietal emerging more promi- 

 nently than in lahyrinthica. Their criticism of Pfeiffer 's fig- 

 ures of streheli was due to the fact that they did not have that 

 species before them, but a much more highly conic form. 



Strebel stated that he had the Mirador plantation Strohila 

 in "a depressed and a high-coiled form, which last resembles 

 the North American form. Transitions are not present. ' ' He 

 gave the dimensions: height 2.4, greater diam. 2.8, lesser 2.6 

 mm. ; 6 whorls. 



7, Strobilops salvini (Tristram). PI. 4, fig. 1. 



Shell deeply umbilicate, conic, trochiform, rufous-corneous, 

 acutely carinate ; spire conic, the summit glossy ; suture deep ; 

 whorls 7, a little convex, regularly increasing, regularly orna- 

 mented above with transverse, acute and very conspicuous but 

 not continuous lirse ; the last whorl delicately striate beneath, 

 peristome somewhat reddish, polished, reflected; aperture 

 semilunar. Diam. maj. 3, miu. scarcely 3, height 2% mm. 

 ( Tristram) . 



Shell rather widely umbilicate, trochiform, angular, tawny, 

 obliquely ribbed above, smoothish below, showing by trans- 

 lucence three spiral laminae. Spire conic, of 51^2 slightly con- 

 vex whorls. Aperture rather oblique, lunar, the peristome 

 thickened, shortly reflected, the parietal wall provided with 

 an entering fold. Greater diam. 3, lesser 23/2, height 1^ to 

 2 mm. {v. Martens). 



Northern Guatemala.: mountain forests of Vera Paz ( Salvin) . 



