174 SYSTEMATIC PALEONTOLOGY 



Anterolateral teeth broader, their margins more or less convex. Lateral 

 spine a little more than twice the length of preceding tooth. Inner sub- 

 orbital tooth broader, obtuse. Costse of carpus and manus more distinctly 

 granulate. 



In very young males the abdominal appendages are much shorter, 

 reaching only to the middle of the penultimate segment. 



Size. — Adult males vary in width from 6^ to 7f inches ; adult females 

 from 5 to 7 inches." — Eathbun, 1896. 



The only determinable specimen of this species was found by Captain 

 C. E. Wharton, of Fishing Creek, Mainland, who obtained it near 

 the mouth of the Choptank river at Cook Point, Dorchester County. 

 The carapace as shown by the illustration, Plate XLI, Figs. 1 and 2, is in 

 a fairly good state of preservation, but the appendages have been largely 

 destroyed. 



Fragments of crabs' claws have been found at several localities, espe- 

 cially at Wailes Bluff near Cornfield Harbor, and at Federalsburg, but 

 it is impossible to determine whether they represent C. sapidus or some 

 other species. Similar remains are recognized among the materials from 

 the Pleistocene of Heislerville, N. J. 



Occurrence. — Talbot Formation. Cook Point, Dorchester County. 



Collection. — Casts of the original specimen, which could not be per- 

 manently secured from Captain Wharton, were made at the laboratory of 

 the Survey and are in the collections both of the Maryland Geological 

 Survey and the Johns Hopkins University. 



Superorder CIRRIPEDIA. 



Order THORACICA. 



Family BALANIDAE. 



Genus BALANUS Lister. 



Balanus crenatus Brugniere. 



Plate XLII, Figs. 1-4. 



Balanus crenatus Brugniere, 1789, Encyclop. Method, (des. Vers). 

 Balanus crenatus Darwin, 1854. Mon. Fossil Balanidae, etc., Pal. Soc, pp. 

 23, 24, pi. i, figs. 6a-Cy. 



