420 Systematic Paleontology 



The genus was initiated late in the Cretaceous, culminated in the early 

 Tertiary and is represented in the recent seas by less than fifty tropical 

 species, most of them denizens of the Indo-Pacific waters. 



SUHCULA AMIGA n. Sp. 



Plate XIV, Figs. 8, 9 



Description. — Shell fusiform in outline, rather slender ; whorls of spire 

 flattened, closety appressed, increasing gradually in size ; body whorl 

 rather abruptly constricted at the base; apical angle approximately 

 25° ; apex broken away in all available material, so that neither the exact 

 number of volutions nor the nuclear characters are determinable; both 

 axial and spiral sculpture developed, the former dominant; axial costas 

 very narrow, rounded, abruptly and prominently elevated, uniform in 

 strength from the fasciole to the anterior suture and, on the ultima, well 

 down to the base, twelve or thirteen in number upon the later whorls; 

 spiral sculpture of very low, broadly rounded lirse separated by linear 

 interspaces, six or seven in number upon the later whorls of the spire, 

 fifteen to eighteen upon the ultima and pillar ; siphonal fasciole about one- 

 fourth as wide as the whorl, closely appressed behind, and obtusely nodu- 

 lated by the costa? of the preceding volution, margined anteriorly by a 

 shallow, broadly undulated depression ; suture lines distinct, impressed ; 

 aperture probably a little less than half as high as the entire shell ; rather 

 narrow, lenticular in outline ; labrum broadly and symmetrically arcuate ; 

 labium smooth, quite deeply excavated at the base of the body; parietal 

 wall evenly washed with callus ; pillar probably straight and rather long. 



Dimensions (imperfect individual). — Altitude 23.5 mm., maximum 

 diameter 11 mm. 



Type Locality. — Friendly, Prince George's County. 



This species suggests Drittia tippana Conrad in general contour and in 

 the character of the axial sculpture. There is nothing, however, in Con- 

 rad's type to suggest the presence of a well developed and rather promi- 

 nent spiral sculpture analogous to that of S. arnica n. sp. 



Occurrence. — Monmouth Formation. Brooks estate near Seat Pleas- 

 ant, and Friendly, Prince George's County. 



Collection. — Maryland Geological Survey. 



