DRYM^EUS, MEXICO AND CENTRAL AMERICA. 35 



Fig. 11 is Pfeiffer's original fenestratus ; figs. 12-14 represent the 

 unique type of piescheli Mart. 



Tliis species, writes von Martens, is somewhat intermediate be- 

 tween 0. dombeyaiws and 0. lilacimts, but is nearer to the latter, 

 from which it differs chiefly in the much rougher, wrinkled and 

 malleated sculpture. The apex is unicolorous white with a reddish 

 hue., and smooth; the band commences on the third whorl, and only 

 three are visible on all whorls except the last, the two others being 

 concealed by the following whorl. The sculpture consists of broad 

 raised wrinkles, most of which are covered by much finer undulated 

 lines. 



I have seen only one specimen (pi. 7, figs. 12-14}, collected at the 

 above-mentioned locality and given to the Berlin Museum by Herr 

 Pieschel, once Secretary of the Prussian Embassy to Mexico. From 

 Reeve's figure it is evident that the original specimen of Pfeiffer's 

 Bitllmus fenestratus in Cuming's collection belongs to the same 

 species ; but in the German collections this name has been applied 

 by Philippi to another species, in which the light intervals between 

 the daik lands and streaks have not the appearance of bow- or bay- 

 windows, but the interrupted brown bands themselves represent 

 square windows. 



Pfeiffer himself seems to have confounded afterwards his own 

 species with another, figured by Philippi as " B. fenestratus" (see 

 0. dunkeri, Pfr.), as the specimen from Pfeiffer's collection de- 

 scribed and figured by Strebel, Beitr. Mex. Land und Su'ssw.- 

 Conch. v, p. 75, t. 6, fig. 19, evidently belongs to the latter; there- 

 fore neither the name of Liebmann as collector,) which is not men- 

 tioned by Pfeiffer in the first description,) nor its position in the 

 subgenus Drymtzus, close to B. dunkeri (Pfeiffer, Malak. Blatt. 

 ]855, p. 151), can be safely quoted for this species. 



D. LILACINTJS (Reeve). PI. 7, figs. 1-10. 



Shell umbilicate, oblong-pyramidal, rather solid, somewhat roughly 

 striate ; white, ornamented with purple-brown bands which are here 

 and there interrupted. Spire long conic, rather acute ; whorls 7^ to 

 8, a little convex, the last about two-sevenths the entire length, base 

 somewhat compressed around the rather wide, compressed, violaceous 

 umbilicus. Columella inflated, somewhat twisted, lilac colored. 

 Aperture little oblique, semioval -auriform, lilac within, banded ; 



