470 Systematic Paleontology 



The species is remarkable among the Pugnelli for the symmetry of the 

 outline, the relatively thin shell, and the absence of sculpture. The type 

 is, unfortunately, unique. 



This unusually well preserved and interesting form is named in honor 

 of Dr. Marcus I. Goldman, a former student of the Johns Hopkins Uni- 

 versity. 



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

 County. 



Collection. — Maryland Geological Survey. 



Family APORRHAIDAE 



Genus ANCHURA Conrad 

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



Type. — Ancliura abrupta Conrad. 



Shell, exclusive of expanded outer lip, slender, fusiform in outline, 

 multispiral ; whorls of spire flattened or feebly convex, tapering uniformly 

 to an acute apex ; body whorl disproportionally large, and frequently more 

 inflated than those of the spire. External sculpture dominantly axial: 

 vigorous spirals sometimes developed on the body. Suture line distinct, 

 impressed, outer lip much expanded and produced either into a single 

 falcate process or two digitate processes, the one anterior and the other 

 posterior; inner lip thickened but not plicate. Anterior canal very long 

 and very slender, often a little sinuous. 



The expanded outer lip and slender anterior canal are broken away in 

 the majority of the fossils. Most of the Maryland representatives are in 

 the form of casts, recognizable by the posteriorly directed outer lip. 



Ancliura is characteristically a Cretaceous genus and quite certainly did 

 not persist into the Tertiary. It may, however, have been initiated in the ' 

 Jurassic, although the affinities of those Jurassic species referred to it are 

 rather dubious. 



Etymology: ayx'. near; oipd tail. A name suggested by the resemblance 

 of the anterior canal to a tail. 



