42-1 Systematic Paleontology 



EOSTELLITES MABYLANDICTJS n. sp. 



Plate XV, Fig. 1 



Description. — Shell very thin, highly polished, of moderate size for the 

 genus; fusiform-elliptical in outline; whorls closely appressed, probably 

 quite numerous and increasing but slowly in size ; apical portion of shell 

 broken away so that exact outline and characters of early turns are lost; 

 whorls of the spire flattened dorso-ventrally, constricted posteriorly, the 

 ultima broadly rounded and merging smoothly into the wide pillar; 

 external ornamentation quite elaborate ; axial sculpture of rounded, quite 

 strongly elevated costse, eleven or twelve to the whorl, subequal in size and 

 spacing, though tending to be somewhat irregular toward the aperture, per- 

 sistent with uniform vigor from the fasciole to the anterior suture upon the 

 whorls of the spire and well down to the base of the body ; axial sculpture 

 upon the fasciole restricted to numerous more or less arcuate costas ; incre- 

 mental in character and having no relation in number or arrangement to 

 the axials in front of them ; spiral sculpture very fine and crowded, least 

 faint in the concave intercostal areas, more or less obsolete upon the 

 summits of the costals and directly in front of the fasciole ; lira; rounded, 

 approximately thirty in number upon the penultima and fifty on the 

 ultima, separated, for the most part, by linear interspirals but more dis- 

 tant as well as more prominent and angular upon the base of the body and 

 the pillar ; fasciole not cut off by a sulcus, but differentiated merely by the 

 close appression and the abrupt evanescence of the prominent axials; 

 suture lines quite deeply impressed; aperture rather broad, lenticular in 

 outline, the outer lip thin, sharp, broadly arcuate, sinuated posteriorly by 

 a feeble siphonal notch ; inner lip broadly and smoothly concave; columel- 

 lar plications apparently three in number, oblique, borne near the initia- 

 tion of the pillar, evanescent before reaching the mouth of the aperture. 



Dimensions. — Altitude 58 mm., maximum diameter 27 mm. 



This species is well characterized by its broad, well rounded axials, close 

 spiral threading, and the three equisized and equispaced columellar folds 

 almost midway in position between the two extremities of the aperture. 

 The type is unique. 



