ISOPODS OF NORTH AMERICA. 



511 



83. Genus LEIDYA Cornalia and Panceri. 



Abdomen distinctly segmented. Pleura! lamellae or lateral parts of 

 the first five segments of the abdomen lanceolate, finely fringed. 



Legs of female terminate in a short, blunt claw. 



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



The pleopods are "lanceolate and fringed." 



Male has the abdomen distinct!}^ segmented. There are five pairs 

 of simple rudimentary pleopods. Uropoda simple, in the form of two 

 long appendages attached to the sixth abdominal segment. ' 



Branchial parasites. 



LEIDYA DISTORTA (Leidy). 



Cepon distortus LEIDY, Journ. Acad. Nat. Sci. Phila. (2), III, 1855, p. 150, pi. xi, 



figs. 26-32. 

 Leidya dislorta CORNALIA and PANCERI, Mem. R. Acad. Sci., Torino (2), XIX, 



1858-1861, p. 114. 



Cepon dixtortus HARGER, Rep. U. S. Fish Comm., Pt. 1, 1873, p. 573 (279); Proc. 

 U.S. Nat. Mus., II, 1879, p. 157; Rep. U. S. Fish Comm., 1879, p. 157; 

 Pt. 6, 1880, p. 311. KOSSMANN, Zool. Ergeb. einer Reise in die Kiist. des 

 Rothen Meeres, III, Malacostraca, 1880, p. 122; Mittheil. aus der Zool. 

 Station zu Neapel, III, 1881, first half, p. 182. 

 Phryxus distortus WALZ, Arbeit, aus d. Zoolog. Instit. d. Univers. Wien, IV, 1882, 



p. 59. 

 Leidya distorta GIARD and BONNIER, Trav. du Labor, de Wirnereux, V, 1887, p. 



68, fig. 12. 



Cepon distortus RICHARDSON, Am. Nat., XXXIV, 1900, p. 309. 

 Leidya distorta RICHARDSON, Proc. U. S. Nat. Mus., XXIII, 1901, p. 579. 

 Locality. Atlantic City, 

 New Jersey, in the branchial 

 cavity of Uca pugilator. 



u Female: Body com- 

 pressed and distorted ovoid, 

 white; abdominal scales com- 

 pletely concealing the pink- 

 ish white ova. Head prom- 

 inent, provided with a pair 

 of large oval disks situated 

 posteriorly. Mouth minute, 

 at the summit of a trilobate 

 papilla. Antennae very small 

 and indistinct. Divisions 

 of the thorax posteriorly 

 strongly costate. Feet in 

 seven pairs, curved forward and downward, ending in a short 

 recurved, abortive booklet. Abdomen deeply segmented. Branchial 

 appendages lanceolate, fringed. 



FIG. 559. LEIDYA DISTORTA (AFTER LEIDY). a, DOR- 

 SAL VIEW OF FEMALE. 6, VENTRAL VIEW OF FEMALE. 

 C, LEG OF FEMALE. 



