12 



EUC ALODIUM. 



ivalpoleana PFR., Monogr. viii, p. 4&7.tyUndrella decollata 

 Nyst, PFR. in Philippi, Abbild. ii, p. 47, pi. 2, f. 1. Monogr. 

 i, p. 368 ; Conchyl. Cab. p. 33, pi. 1, f . 2. 



* Very near E. tlandianum, resembling it in size and color, 

 but somewhat more slender, and often of a darker brown tint. 

 The chief difference however, is in the sculpture," E. walpo- 

 leanum having more numerous and narrower, thread-like 

 riblets, their intervals being closely crinkled with spiral striae 

 (pi. 8, fig. 22). The basal angle also is more pronounced. 

 The internal column is slender and weakly curved in a spiral, 

 though usually less so than is shown in fig. 3. 



Strebel has defined a small form, somewhat intermediate 

 between E. walpoleanum and E. blandianum, as form B (pi. 

 4, fig. 5) . In color and gloss it resembles E. blandianum, but 

 has the sculpture of E. walpoleanum, the riblets standing as 

 close as in that species, though somewhat stronger. On the 

 penultimate whorl (16% mm. wide) there are about 100 rib- 

 lets, while in an especially small example of blandianum with 

 the penult, whorl 17 mm. wide, there are only about 65 riblets. 

 The internal pillar is like that of E. blandianum . This form 

 is from Cuatitlan and San Juan Miahuatlan. 



E. INSIGNE Crosse & Fischer. PI. 4, figs. 6, 7. 



Shell arcuate-rimate, cylindric-turreted, solid, hardly shin- 

 ing, livid ashen-flesh colored. Spire perceptibly tapering, 

 broadly truncate; suture impressed; 10 remaining whorls a 

 trifle convex, regularly and subobliquely costulate, the last 

 slightly descending, shortly free in front, subangular above, 

 the base regularly rib-striate, having an inconspicuous thread- 

 like keel below the middle. Aperture slightly oblique, suban- 

 gularly ovate, whitish inside ; peristome continuous, thickened, 

 shortly reflexed throughout, whitish, the columellar margin 

 slightly subplicate within. Internal axis unknown. Length 

 74, diam. 18 mm. (C. & F.). 



Southern Mexico (Ghiesbreght). 



E. insigne C. & F., Journ. de Conchyl. 1872, p. 301 ; Moll. 

 Mex. i, p. 366, pi. 14, f . 7, la. v. MART., Biologia Centr.- 

 Amer., Moll., p. 259. Cylindrella insignis C. &. F., PFR., 

 Monogr, viii, p. 428. 



