1913.] NATURAL SCIENCES OF PHILADELPHIA. 651 



"Rio Jary, six specimens, one very immature. 



"Similar to D. rex regina, but having coarser spirals, a larger 

 aperture and more deviating last whorl. These two are more nearly 

 related to D. 7nacapa Moric. than to transversa by the greater number 

 of spirals. With present knowledge, they seem specifically distinct 

 from both. The young stage resembles D. transversa jaryensis. 

 "Doryssa rex regina Pilsbry, n. subsp. PI. XXIV, figa. 16, 17. 



"The shell is large and tapers to a narrow truncation. Spiral 

 grooves numerous, strongest on the last whorl, seven or eight on the 

 penultimate whorl; microscopic lineolation obsolete on the later 

 whorls. Axial folds strong, slightly protractive, extending upon 

 the last whorl, about 12 on the penultimate whorl. Upper whorls 

 nearly flat, penultimate whorl more convex. Suture deepening on 

 the last whorl, which in its last half forms a narrow horizontal 

 shoulder below it. When cleaned of the rusty black incrustation, 

 the spire is tawny, becoming more yellowish above, indistinctly 

 maculate with black, last whorl bay. 



"Length 67.5, diam. 22.7 mm.; 7| whorls remaining. 

 " 68, " 21.5 " 9" " 



"Rio Jary, St. Antonio da Cachoeira, ten specimens. 



"This is related to the preceding form, in which the same characters 

 are more exaggerated. In specimens evidently adult, and of the 

 same length, D. rex regina is decidedly narrower with a shorter 

 aperture. Very likely a distinct species." 



Doryssa buUata (Lea). 



Melania bullata L^a, Obs. Gen. Univ., XI, p. 85, t. 22, fig. 29. 

 Twenty-four specimens come from the Rio Jary near St. Antonio 

 da Cachoeira "in the bed of the main river, immediately above the 

 great falls." 



Doryssa globosa n. sp. PL XXV, figs. 1, 2. 



Shell rather light for the genus, globose conic, with sides nearly 

 straight and forming an apical angle of about fifty degrees, covered 

 with a dense epidermis shading from yellow-olive on the base to 

 dark brown above, having well-developed spiral keels and vertical 

 ribs, the former better developed than the latter which become 

 obsolete on the base, their intersection being markedly tuberculate, 

 the tubercles elongate on spiral lines; lines of growth strong, with 

 fine spiral striae, showing in places under a glass, in the interspaces 

 of the spiral keels; first two whorls with four spiral keels, the last 

 two with five, the added keel beginning in the suture and becoming 



