246 REPORT OF NEW JERSEY STATE MUSEUM. 



Description of male. — All thoracic segments distinct, and 

 lateral edges contiguous. First four abdominal segments well 

 defined laterally, but fused in middle of dorsal surface. Last 

 two segments form single larg"e piece, and fused terminal seg- 

 ment indicated only by small median point on hind edge. Body 

 length a trifle more than twice its width. Eyes present. Rudi- 

 mentary pleopoda pairs of small oval processes, one pair on each 

 abdominal segment. Abdomen about one and one-half times 

 wide as long. Length 2.5 mm. 



Remarks. — ^Parasitic on our common prawn, Palarmouctcs 

 zndgaris and found from New Hampshire to Florida and Missis- 

 sippi. I have secured a number of examples at Cape May and 

 Ocean City. Interesting specimens are those secured at Red 

 Bank, in Monmouth county, may years ago. by T. R. Peale, and 

 others at Beach Haven by Dr. Joseph Leidy. I have also found 

 prawns in the Elk River (fresh water), near Elk Neck, infested 

 with this parasite. 



Genus LEIDYA Cornalia and Panceri. 



Leidya (Cornalia) Cornalia and Panceri,^ Mem. R. Acad. Sci. Torino, (2) 

 XIX, 1858-61 (1858), pp. Ill, 114. Type Ccpon distortus Leidy, mono- 

 typic. 



Female. — Body with neither side swollen. Abdomen dis- 

 tinctly segmented. Pleural lamellae or lateral parts of first five 

 abdominal segments lanceolate, finely fringed. No median dor- 

 sal tubercles on sixth and seventh segments of thorax. All legs 

 of both sides present, each ends in short blunt claw. Exopods 

 present and nearly equal on all seven pairs of legs. Pleopods 

 lanceolate and fringed. 



Male. — Abdomen distinctly segmented, and lateral parts of 

 segments not elongated. Five pairs of simple rudimentary pleo- 

 pods. Uropoda simple, as two filiform or long appendages at- 

 tached to sixth abdominal segment. 



Remarks. — Branchial parasites. 



' These authors credit the genus to Cornalia 1857, and if published then I 

 have been unable to locate it. 



