188 PROCEEDINGS OF THE ACADEMY OF [1890. 



DESCRIPTION OF A NEW SPECIES OF HELIX. 

 BY JOHN FORD. 

 Helix (Planispira) Deaniana Fonl. 



Shell uml)ilicate(l, discoidal, flattened above and below ; thin but 

 solid ; white, with a broad chestnut-brown zone encircling the last 

 whorl just above the periphery, and continued on the next whorl 

 immediately above the suture. 



Surface comjjaratively smooth, the growth strise being very faint. 

 AVhorls 4i, convex, the inner ones sunken a trifle below the level of 

 the penultimate whorl, which projects slightly above the last whorl. 

 The latter is large, rounded above, below and at the periphery, 

 slowly descending in front to about the middle of the preceding 

 Avhorl ; narrowly constricted behind the basal lip, much inflated just 

 behind the constriction and obliquely excavated in the umbilicus 

 behind the columellar lip. Aperture very oblique, rotund, lunar, 

 Avhite, showing the brown bands inside. Lip broadly expanded on 

 upper and outer margins, very narrowly reflexed on the basal and 

 columellar. The outer and basal portions are of a beautiful pink 

 rose-color. The parietal wall has a thin wash of callus. Umbilicus 

 funnel-shaped and slightly impinged upon by the columellar lip. 



Alt. Hi, greater diam. 26, lesser 20 mill. 



Aperture, oblique alt. 16, breadth 14? mm. including peristome. 

 Width of umbilicus 2=j mm. Hab. New Guinea. Though resem- 

 bling somewhat the figure of H. tortilabia in Reeve's Monograph 

 (PI. 92, fig. 498), it has a far more broadly expanded superior lip, 

 narrower baso-columellar lip, and the body-whorl is much less gib- 

 bous behind the lip than in Reeve's figure. 



This beautiful species was collected in the interior of New Guinea 

 by the late Mr. Wm. Denton and presented to the Academy by his 

 son, Mr. Shelley Denton, of Wellesley, Mass. 



It has been named in honor of Mr. Geo. W. Dean of Kent, Ohio, a 

 dear friend of both gentlemen, and a most worthy student of con- 

 chological science. 



