MEXICAN LEPTINARIA. 307 



wide, dentate-twisted. Aperture slightly oblique, sinuate- 

 oblong ; peristome simple, unexpanded, the right margin some- 

 what curved forward, 'columellar margin dilated, somewhat 

 appressed. Length of largest specimen 9, diam. 4, aperture 

 3.66x2 mm. (Pfr.). 



Mexico: State of Vera Cruz at Mirador (type loc., Ber- 

 endt), Misantla and neighboring places and Canada de Coa- 

 tepec near Jalapa (Strebel) ; Texolo ('S. N. Rhoads). 



Spiraxis mexicana PFR., Malak. BL, xiii, 1866, p. 84; Mon- 

 ogr., vi, 194. 'CROSSE & FISCHER, Miss. Sci. Mex., Moll., i, p. 

 617. Lamellaxis m., STREBEL, Beitrag, v, p. 109, pi. 7, f. 14, 

 pi. 17, f. 3, 6 6, d, 1 a, 38. Leptinaria m., MARTS., Biologia, 

 p. 316, with var. turrita and abbreviata. 



Strebel, who examined and figured Pfeiffer's type (pi. 41, 

 fig. 2) states that there were two species mixed in the orig- 

 inal lot, part being referable to modestus Strebel. The sculp- 

 ture consists of an extremely fine fold^striation and fine, some- 

 what arcuate riblets, standing not very regularly and not 

 very closely, sometimes widely spaced, becoming weaker and 

 wholly or almost disappearing towards the lower half of the 

 whorl, especially on the last whorl. The whorls are rather 

 convex, and weakly terraced at the deep sutures. The um- 

 bilicus is narrow. 



Strebel found a narrower and a wider form of the species, 

 sometimes occurring together, but more often in separate colo- 

 nies. The narrower form (fig. 4) measures about 9 to 9.66 x 

 3.3 to 3.5 mm., aperture 3 to 3.2. It has been named var. 

 turrita Martens, but seems, as Strebel held, not distinguish- 

 able from typical mexicana. 



Var. abbreviate Martens, pi. 41, fig. 5. Wider; length 7.7, 

 diam. 3.6 mm., with 6^4 whorls. This is Form B of Strebel. 

 The specimens taken by Rhoads at Texolo agree best with this 

 form. 



\ ar. utilensis nov. PI. 41, figs. 9, 10. 



Specimens collected by Mr. 'C. T. Simpson at Utila Island, 

 Honduras, have the first 2*4 whorls smooth, the next 2 or 3 

 sculptured with well-spaced, thread-like riblets, and the last 



