260 HELIX. 



LYSINOE. 

 P. 75, subsection Odontura, after H. eximia Pfr. insert 



H. HUMBOLDTIANA Valenciennes, 1841. PL 69, figs. 34-36. 



Narrowly umbilicate, depressed-globose, rather thin but solid, 

 opaque, with a very thin yellowish-brown cuticle, encircled by three 

 dark chestnut bands, which are narrower than their interspaces, two 

 above, one below the periphery, more or less interrupted by longitu- 

 dinal irregular whitish streaks ; rudely, irregularly striate, com- 

 pletely covered by a dense fine granulation ; spire low conoid, ex- 

 centric, with blunt apex and smooth polished first whorl ; sutures 

 well impressed ; whorls 4$, well rounded, rapidly increasing, espe- 

 cially the last, which at the aperture is double the width of the 

 penultimate; body-whorl large, depressed-inflated, deeply indented 

 around the umbilicus, descending anteriorly; aperture rotund or 

 oval, lunate, quite oblique, pinkish-white and showing the bands 

 within ; peristome obtuse, slightly labiate, regularly arcuate, its ter- 

 minations converging, outer and basal margins subexpanded, colu- 

 mellar margin at its insertion triangularly expanded, adnate above 

 the umbilicus, which it narrows and conceals more or less, joined to 

 the superior margin by a light white callus. Diam. 33, alt. 28 mill. 



Central Mexico. 



H. badiocincta Wiegm., mss., teste Pfeiffer, is synonymous. 



A beautiful species formerly classed in Pomatia, but doubtless be- 

 longing in Odontura. It is quite variable in proportions, a large 

 specimen before me measuring: diam. maj. 40, min. 28, alt. 34 mill. 



In this large form the shell is transversely expanded, the whorls 

 obliquely flattened above, giving the spire a conoid shape, and the 

 aperture is transversely oval. The thin cuticle exfoliates very 

 readily. 



Var. BUFFONIANA Pfeiffer, 1845. PL 69, fig. 37. 



More coarsely obliquely striate, thinner, less distinctly granulate, 

 darker in color, the bands indistinct, reduced to two. last whorl 

 more inflated, peristome less expanded. Diam. 37, alt. 35 mill. 



It is H. humboldtiana Desh., nee VaL, H. matronula Wiegm. 

 mss., teste Martens. 



CAMPYLJEA. 



P. 117, subsection Chilotrema, insert under H. lapicida L. 



