1913.] NATURAL SCIENCES OF PHILADELPHIA. 633 



Genus SOLAROPSIS Beck. 

 Solaropsis rugifera Dohrn. PI. XXII, figs. 1, 2. 



Helix rugifera Dohrn, Jahrbuch. d. deutsch. Mai. Gesell., 1882, p. 100. 

 Pilsbry, in Man. Conch. (2), v, p. 195, quoted Dr. Dohrn's remarks 

 and description of this species as follows: "I possess, unfortunately, 

 only a single specimen of this species, not fully adult, which I received 

 years ago with other species from eastern Peru. On account of the 

 sculpture, which differs remarkably from that of all allied forms, 

 I have decided to give it an (admittedly) incomplete description, 

 in the hope that someone may be able to complete it. H. selenostoma 

 Pfr., which is its nearest species in contour, is more narrowly con- 

 voluted, proportionally higher, and more narrowly umbilicated. " 



"Broadly umbilicate, deplanate, thin, obliquely rugose plicate, 

 the plicse vanishing beneath, brownish corneous, fiammulate at the 

 sutures and narrowly 2-banded in the middle of the whorl with 

 reddish; spire plane, apex rather smooth; suture moderately pro- 

 found; whorls nearly 5, convex, the last rounded, not descending in 

 front; umbilicus ecjualling j the diameter, funnel-shaped; aperture 

 a little oblique, rounded lunar, peristome (unknown)." 



Using a perfectly mature specimen, I would amplify this descrip- 

 tion as follows: 



Shell broadly umbilicate, deplanate, thin; embryonic 1^ whorls 

 smooth, a fine radiating sculpture beginning on the second whorl 

 and showing minute spiral lines under a strong glass, the sculpture 

 becoming distinctly rugose plicate on the third whorl and continuing 

 to the periphery of the last whorl, from which point, the rugosity 

 disappearing, the plicse continue well into the umbilicus as well 

 marked, irregularly sized and spaced costulse, everywhere crossed 

 by fine, irregularly spaced spiral lines which show most distinctly 

 on the costulse; brownish corneous, fiammulate at the sutures, and 

 narrowly, interruptedly, 2-banded with reddish, the lower band 

 placed at the periphery, the upper half way between this and the 

 fiammules, except on the last quarter turn, where the flammules 

 extend to the second band; spire plane; sutures moderately deep; 

 whorls 5|, convex, the last rounded, scarcely descending in front; 

 umbilicus equaling about j the diameter, perspective; aperture a 

 little oblique, rounded lunar; peristome white, very slightly reflected 

 throughout, the reflection becoming more marked at the junction of 

 the basal part with the parietal wall. 



In none of the specimens, however young, does the sculpture 

 entirely disappear on the basal portion of the last whorl as noted by 

 42 



