AMPHIDROMUS, GROUP \I. 173 



parently not referred to in the text. Figures 9, If) are Canefri's 

 original?, 6-8 representing specimens in the collection of the 

 Academy. 



A. DOIIKM (Pfeitfer). PI. 58, figs. 11, 12, 13; pi. 59, figs. 24-27. 



Shell either dextral or sinistral, ovate-pyramidal, imperforale, 

 rather solid, smoothish, liglitly striatulate. Bright straw or greenish- 

 yellow, the base of the hist I'-hurl f/reen, or in sonic shells the darker 

 color invades most of the last whorl or even the penultimate whorl ; 

 shell-substance purple under the green, white under the yellow. One 

 or two black varices usually present. Spire high-conic, the apex 

 white or yellow. Whorls 7, slightly convex. Aperture oblique, 

 purplish and white inside ; peristome white, somewhat thickened, 

 revolute and closely actuate upon the reverse of the lip, the adnate edge 

 conspicuously black-bordered. Parietal callus rather strong, white. 



Alt. 45, diam. 24, longest axis of aperture 20^ mill. 



Alt. 39, diam. 23, longest axis of aperture 19J? mill. 



Alt. 47, diam. 25, longest axis of aperture 23 mill. 

 Cochin China (Pfr., coll. A. N. S.); Powlo- Condor (Morelet). 



Bulimus Dohrni PFR., P. Z. S. 1863, p. 525; Novit. Conch, p. 

 312, pi. 75, f. 12, 13; Monogr. vi, 20. B. perversus var. dohrni 

 MORELET, Ser. Conchyl. iv, p. 200 A. dohrni FULTON, t. c., p. 

 72 (exclusive of synonym). 



The completely adnate, black-edged lip reminds one of A. er- 

 versus and interruptus. Tlie typical form is rather pyramidal, \. itli 

 only the base green (pi. 59, figs. 26, 27), and is usually dextral ; 1 nt 

 much shorter specimens than those figured are before me, both d?x- 

 tral and sinistral. 



A more solid, more ovate form also occurs (pi. 58, figs. 11, 12, 

 13) in which the green color is more extended, and sometimes be- 

 comes brownish on the penultimate whorl ; there is often a dark 

 line along the edge of the parietal callus, and as in the typical shells 

 it coils either way, and varices may be present or absent. The.-e 

 shells approach certain forms of A. comes, though the development of 

 the lip and brighter yellow of the spire sufficiently distinguish them. 

 The name is to honor Dr. Anton Dohrn. 



The quotation of A. interruptus infraviridis as a synonym of 

 dohrni by some authors, is an error. There is no direct connection 

 between them. 



