54 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.60 



type of a new genus, which should belong to the family Dicheles- 

 thiidae rather than to the Lernaeidae. These reasons were based 

 upon the external morphology, and it is gratifying to find that 

 the internal structure gives added and convincing argument to the 

 same end. 



In the genus Peniculus^ as in all the Lernaeidae, the ovaries are 

 dorsal to the intestine at the anterior end of the second fourth of 

 the fused trunk. The oviducts pass around the outside of the in- 

 testine to the ventral surface and thence straight back to the vulvae. 

 There is not a convolution or the suggestion of one, and the eggs 

 are pressed together so tightly that they are flattened into thin disks 

 like a row of coins. In sharp contrast with this the oviducts in 

 fuTcatus are convoluted back and forth until they fill the entire 

 space, lateral and dorsal, between the intestine and the body wall. 

 And the eggs inside of them remain spherical and are scattered 

 about loosely without any definite arrangement. Accordingly we 

 are justified in placing the new genus in the present family, to 

 which it corresponds in all particulars, with the single exception 

 of the posterior processes. 



Genus KR0YERIA P. J. van Beneden. 



Kr0yeria Beneden, Bull. Acad. Roy. Belgique, vol. 20, 1853, p. 24. 

 LoiicMdium Gesstaeckee, Archiv fiir Naturg., vol. 20, 1854, pt. 2, p. 185 ; 



1858, p. 24. 

 Kr0yefia Claus, Ueber den Bau nnd die Entwickelung parasitischer Crus- 



taceen. Cassel, 1858, p. 24. 

 Kr0yeria Nordmann, Bull. Soc. Imp. des Nat. Moscou, vol. 37, 1864, p. 468. 

 Kr0yeria Hesse, Ann. des Sci. Nat., ser. 6, Zool., vol. 8, 1879, p. 15, art. 29. 

 Lonchidium Bassett-Smith, Proc. Zool. Soc. London, 1899, p. 473. 

 Kr0yeria Brian, Copepodi parassiti del Pesci d'ltalia, 1906, p. 67. 

 Kr0yeria T. and A. Scott, British Parasitic Copepoda, 1912, p. 120. 



Generic characters of female. — Cephalothorax broad, covered with 

 a carapace having rounded lobes at its posterior corners. Inside each 

 lobe on the posterior margin is a movable styliform process, project- 

 ing backward. Second, third, and fourth thorax segments free, each 

 with a pair of swimming legs, but without lobes or dorsal plates. 

 Fifth and genital segments completely fused, elongate, narrow cylin- 

 drical, with nearly straight lateral margins. Abdomen short; anal 

 laminae long, narrow, and setose. 



First antennae filiform, seven- jointed; second pair stout and che- 

 late; mandibles and first maxillae small and rudimentary; second 

 maxillae and maxillipeds large and armed with powerful claws. 

 Four pairs of biramose swimming legs, each ramus three-jointed, 

 setose. Egg strings linear, as long as the whole body; eggs thick 

 and not strongly flattened. 



