Maeyland Geological Survey 467 



tabulated posteriorly; body whorl slightly oblique, and very feebly con- 

 stricted at the base; external sculpture ornate, reticulate, the spirals 

 dominant; axials about twenty-five in number, low, obtusely angulated, 

 uniform in size and spacing, separated by intercostals of approximately 

 equal width ; spirals low, flattened fillets, twelve in number on the body of 

 the type, for the most part, equisized and equispaced, overriding the 

 costals and somewhat nodulated at the intersections; areas included 

 between the costals and spirals forming a series of squarish pits; space 

 between the two posterior spirals upon the ultima wider than the rest and 

 quite strongly concave, cut up by the costs into numerous rectangular 

 pits ; aperture rather narrow ; outer lip broadly arcuate ; parietal wash 

 very heavy; siphonal fasciole distinct; anterior extremity emarginate; 

 other apertural characters concealed by the solid matrix. 



Dimensions (imperfect specimen). — Altitude 19 mm., maximum diam- 

 eter 12 mm. 



Type Locality. — Two miles southwest of Oxon Hill on Mrs. Linton's 

 branch. Prince George's County. 



This species runs smaller and relatively more elongate than its southern 

 analogue, M. cancellaria Conrad. In general aspect it is much less rude 

 and heavy than Conrad's species, and the external sculpture, though simi- 

 lar in character, is much finer and more delicate. 



Occurrence. — Monmouth Fohmation". Brightseat and 2 miles south- 

 west of Oxon Hill, Prince George's County. 



Collection. — Maryland Geological Survey. 



Family STROMBIDAE 



Genus PUGNELLUS Conrad 

 [Jour. Acad. Nat. Sci., Phila., 2d ser., vol. iv, 1860, p. 284] 

 Type. — Strombus densatus Conrad. 



" General form of Strombus, with a labrum angular and salient at the 

 upper extremity, with sinus in the upper margin contiguous to the angle 

 or protuberant end of the tip, the outer margin of labrum and submargin 

 very thick or callous ; beak straight or curved forwards. This genus 



Etymology: Diminutive of pugnus. fist. 



