1913.] NATURAL SCIENCES OF PHILADELPHIA. 653 



towards the bottom, the keels showing some tendency to irregular 

 tuberculation. Aperture very oblique, oblong ovate, subangulate 

 above and below, whitish within, tending to yellowish on the colu- 

 mella; parietal wall with a rather strong callus above in which lies a 

 well-marked posterior canal, below covered by an extension of the 

 epidermis and spiral sculpture which reaches well within the mouth; 

 outer lip crenulated by the external sculpture, rounded rather 

 evenly into and through the lower lip, which is effuse in a nearly 

 horizontal plane, the so-called ''auger-shaped lip" of Lea; columella 

 slightly concave, scarcely revolute, nearly vertical, and joining the 

 shovel-shaped base nearly at a right angle. 



Estimated altitude of the type 55.5, actual alt. 45.5, diam. 27.5, 

 length of aperture 21, width of aperture 12 mm. 



The slenderest specimen with 4| remaining whorls measures 

 alt. 49.5, diam. 25 mm. 



Nine specimens come from the Rio Iriri, an affluent of the Rio 

 Xingii on the left side. The species, which seems to be new, is 

 somewhat related to D. pernambucensis Rve., which is a much more 

 slender shell. It is named for Professor E. C. Starks, of Stanford 

 University, a member of the Expedition. 



Doryssa heathi n. sp. PI. XXV, figs, 3, 4, 7. 



Shell turreted, solid, tapering somewhat irregularly to the beginning 

 of the last whorl, at which point a definite spiral constriction begins 

 which extends to the aperture; spire varying greatly in different 

 specimens, only one of which (type) is mature, some tapering regu- 

 larly, others almost pupseform ; epidermis very dense, shining ; 

 color varying from dark olive-brown to almost black; initial whorls 

 lost in all specimens, remaining whorls, except the last, nearly smooth, 

 but showing growth lines and, under a glass, minute spiral strise 

 everywhere, and a tendency to the formation of low, rounded spiral 

 keels, two at the top and one at the bottom of each whorl; sutures 

 well impressed, producing slight shouldering in some specimens; 

 sculpture changing abruptly at the beginning of the last whorl, at 

 which point a distinct, slightly tuberculate vertical rib appears, 

 followed by fourteen others which are more marked and crossed by 

 five well-defined spiral keels, the periphery of the whorl being dis- 

 tinctly biangulate by the development of two rows of strong tubercles 

 on the third and fourth keels, the first and second keels becoming 

 moderately tuberculate on the last quarter turn, the last keel being 

 slightly tuberculate throughout; base well rounded, circled by four 

 nearly equal and equally spaced keels, which roughen as they advance, 



