AURIS-EUDOLICHOTIS. 109 



low are based upon a study of a large number of shells of nearly all 

 the species ; but no very large portion of the area probably inhab- 

 ited by these species is covered by my series, nor by the specimens 

 studied by other authors. 



It is hardly necessary to state that the " key " here presented 

 merely gives suggestions as to the identity of any given specimen. 

 No key can be made which will open to us the labyrinth of varia- 

 tions more tortuous than King Minos' Cretan maze which sur- 

 rounds the " specific types " of this company. 



Key to species of Eudolichotis. 



I. Outer lip sinuous, contracted or straightened in the middle, 

 a. Aperture long and narrow, produced at base. 



b. Lip narrow, not calloused ; brown with white zigzag 

 hydrophanous lines ; papillose, hauxivelli, p. 120. 



bb. Lip wider, calloused ; no hydrophanous markings ; not 

 papillose ; base of shell pinched, 



distorta (p. 109), aurissciuri, p. 112. 

 act. Aperture shorter and wider, hardly produced below, 



ijlabra (p. 113), lacerta, p. 115. 

 II. Outer lip arcuate, not contracted in the middle. 



a. Base decidedly pinched ; lip thickened within toward the 

 base, where there is a notch. 

 b. Large, solid, finely rugose ; striped and speckled, 



xitinata, p. 116. 

 bb. Small, thinner, smoothisb ; zigzag-streaked, 



enryompluda, p. 116. 



aa. Base not distinctly pinched ; outer lip not distinctly cal- 

 loused, with no basal notch, 



perdix (p. 118), dilhci/ii!<in<t (p. 118), Hildas, p. 119. 



A. DISTORTA Bruguiere. PL 40. figs. 21-32. 



Shell oblong-fusiform, umbilicate or perforate, solid and strong. 

 Light yellow or whitish, with brown longitudinal stripes, which 

 may be narrow and distinct or wide, zigzag, flecked with whitish or 

 variously interrupted; sometimes tawny-brown throughout; or 

 brown, blotched with white. Surface rib-striate on spire, the last 

 whorl cut into coarse diamond- shaped granules, especially on the 

 back. Whorls 5i, gently convex, the latter half of the last strongly 



