ARTHROPODA. 847 



Description. "Right propodite robust, evenly convex on both 

 sides, but slightly more convex above than below, surface slightly 

 roughened everywhere by small flattened, separated, scale-like 

 asperities; lower margin blulntly angular and marked by a 

 slight groove ; upper margin narrowly rounded, bearing a couple 

 of short conic spines, inserted slightly below the edge and directed 

 downward and forward; on each side there is a rounded tubercle 

 at the base of the dactylopodite. Fixed finger rather slender, 

 with a series of coarse tubercles (worn flat) along its grasping 

 edge. Dactylopodite armed with a short conic spine near its 

 base (continuing the row of similar spines on the upper margin 

 of the propodite), its grasping face with a series of coarse 

 tubercles, worn flat. Carpopodite ( ?) irregularly cylindrical, 

 gibbous, a little compressed and faintly grooved along the outer 

 side, bearing a series of several short spines along the inner. 

 Abdominal somites with highly arched tergum, the surface punc- 

 tate." (Pilsbry.) 



Re marks.-:-" This species is based upon a right hand and group 

 of four abdominal somites in the collection of the Academy of 

 Natural Sciences of Philadelphia, and a right hand and carpo- 

 podite (?) in that of the Wagner Free Institute. The fixed 

 finger is broken in both specimens, and the proximal portion 

 of the hand is wanting. In the Wagner Institute specimen 

 the base of the dactylopodite remains. 



A much smaller propodite from Monmouth County, N. J., 

 shows a series of four short spines along the upper margin; 

 but, perhaps, this specimen belongs to an allied but distinct 

 species, as it is much less convex inside than the larger claws. In 

 the large specimens from Lenola only the anterior two spines 

 remain, as described above, owing to the loss of the posterior 

 portion of the hand. 



On account of the mutilated condition of the remains, meas- 

 urements cannot readily be given, but an Astacoid somewhat 

 larger than the common eastern crayfish is indicated. The 

 figures are of natural size. The high arch of the abdomen may 

 be partly due to lateral compression. Until further remains come 

 to light, and especially the cephalothorax, the generic position 

 of the species will be uncertain." (Pilsbry.) 



