362 Systematic Paleontology 



Description. — Left manus robust, evenly convex on both sides, but 

 slightly more convex externally than within, the surface slightly rough- 

 ened everywhere by small flattened, separated, scale-like asperities ; lower 

 margin bluntly angular and marked by a slight groove; upper margin 

 narrowly rounded, bearing two short conic spines on the portion preserved. 

 These are inserted slightly below the edge on the inner side, and directed 

 upward and forward; and on each side there is a half-round tubercle at 

 the base of the dactylus. Pollex rather slender, with a series of coarse 

 tubercles (worn flat) along its grasping edge. Dactylus armed with a 

 short conic spine near its base (continuing the row of similar spines on the 

 upper margin of the palm), its grasping face with a series of coarse 

 tubercles worn flat. Abdominal somites with highly arched tergum, the 

 surface punctate. 



This species was based upon a left hand ( figs. 8, 9 ) and group of four 

 abdominal somites in the collection of the Academy of Xatural Sciences of 

 Philadelphia. A left (figs. 3, 4) and a right hand and other fragments 

 are in the Wagner Free Institute. The pollex is broken in both specimens, 

 and the proximal portion of the hand is wanting. In the Wagner Insti- 

 tute specimen the base of the dactylus remains. Breadth of hand of the 

 type specimen 21.5 mm., thickness 13 mm. 



The proximal part of a manus and a carpus are preserved in specimens 

 from the Chesapeake and Delaware Canal. The carpus is somewhat like 

 that of Homarus in shape, spinous on both sides. The surface of the 

 manus is shown in the photograph, fig. 3. 



Occurrence. — Matawan Formation. Deep cut of the Chesapeake and 

 Delaware Canal, Delaware. 



Collections. — Maryland Geological Survey, Academy of Natural 

 Sciences, Wagner Free Institute of Science. 



HOLOPARIA GLADIATOR Pilsbry 



Plate X, Fig. 6 



Holoparia gladiator Pilsbry, 1901, Proc. Acad. Nat. Sci., Phila., p. 116, pi. 



i, figs. 15, 16. 

 Holoparia gladiator Pilsbry, 1907, in Weller, Geol. Survey of New Jersey, 



Pal., vol. iv, p. 848, pi. ex, figs. 16,17. 



