ISOPODS OF NORTH AMP:R10A. 



511 



83. Genus LEIDYA Cornalia and Panceri. 



Abdomen distinctly sojrmontod. PUninil lumelliv or lateral parts of 

 the tirst five segments of the abdomen lanceolate, rtnely fringed. 



Legs of female terminate in a short, blunt claw. 



Exopods present and nearly etiiial on all seven paii's of legs. 



The pleopods are '' lanceolate and fringed." 



Male has the abdomen distincth" segmented. There are five pairs 

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

 long appendages attached to the sixth al)dominal segment. 



Branchial parasites. 



LEIDYA DISTORTA (Leidy). 



Cepon (fistortus Leidy, Journ. Acad. Nat. Sci. Philu. (!'), Ill, 1855, p. 150, pi. xi, 



figs. 26-32. 

 Lekhja disiorta Coknalia and Paxceri, Mem. R. Acad. Sci., Torino (2), XIX, 



1858-1861, p. 114. 

 Cepon diMurtus Hargek, Rep. U. S. Fish Coimii., Pt. 1, 1873, p. 573 (279); Proc. 

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

 Pt. 6, 1880, p. 311. — Kossmann, ZooI. 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. 

 I'Jiryxtis distortus Walz, Arbeit, aus d. Zoolog. Instit. d. l^nivers. Wien, IV, 1882, 



p. 59. 

 Leidya distorta Giakd and Bonxier, Trav. du Labor, de Wimereux, V, 1887, p. 



(38, fig. 12. 

 Cepon distortus Richardsox, Am. Xat., XXXIV, 1900, p. 309. 

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

 Local it (/. — Atlantic City, 

 New Jersey, in the branchial ^ ^ 



cavit}' of Ucapugllator. 



''Female: Body com- 

 pressed and distorted ovoid, 

 white; abdominal scales com- 

 pleteh' concealing the pink- 

 ish white ova. Head prom- 

 inent, provided with a pair 

 of large oval disks situated 

 posteriorly. ^louth minute, 

 at the summit of a trilol)ate 

 papilla. Antenna^ very .small 

 and indistinct. Divisions 

 of the thorax posteriorly 

 strongly costate. Feet in 

 seven pairs, curved forwai-d and downward, ending in a short 

 recurved, abortive booklet. A})d()men deeph' segmented. Branchial 

 appendages lanceolate, fringed. 



Fig. 559.— Leidya distorta (After Leidy). a. Dor- 

 sal VIEW OF FEMALE. '), VENTRAL VIEW (IK FEMALE, 

 r. Leg of FEMALE. 



