416 Systematic Paleontology 



TURRIS TERRAMARIA II. sp. 



Plate XIV, Fig. 6 



Description. — Shell very small and fusiform in outline ; maximum 

 diameter in front of the median horizontal ; whorls probably six or seven 

 in number, although neither this nor the apical characters are determinate 

 as the apex is broken away ; whorls of spire flattened in front of the pos- 

 terior suture, very feebly inflated medially, increasing regularly and 

 rather slowly in size ; body whorl evenly inflated medially, flattened pos- 

 teriorly, smoothly constricted basally ; external sculpture dominantly 

 spiral ; axial sculpture restricted to inconspicuous, protractive, peripheral 

 costae, nodose in character, approximately twelve to a whorl, and to very 

 short retractive riblets in front of the posterior suture, approximately 

 twenty-five to a whorl ; spiral sculpture also more or less irregular, the 

 spirals seven or eight in number upon the penultima, the second and 

 third from the anterior suture more prominent than the rest, the five pos- 

 terior spirals upon the body lower and narrower than those in front of 

 them ; medial and basal portions of the body and the pillar sculptured 

 with approximately twenty flattened lira nearly uniform in size and 

 spacing, though evanescent upon the axial nodes and increasingly more 

 crowded toward the base of the pillar; interspaces squarely channeled, 

 and, for the most part, narrower than the spirals, faintly striated by the 

 incrementals ; suture lines impressed ; aperture rather narrow, clavate ; 

 outer lip thin, sharp, symmetrically arcuate ; inner lip smoothly concave, 

 apparently non-plicate ; pillar straight and rather long. 



Dimensions (imperfect individual). — Altitude 9.1 mm., maximum 

 diameter 4.5 mm. 



Occurrence. — Monmouth Formation. Brightseat, Prince George's 

 County. 



Collection. — Maryland Geological Survey. 



