COPEPODA 



351 



Fig. 553 



Fig. 554 



Fig. 553 — Lernewnicus 

 radiata (Verrill). Fig. 

 554 — Chondr acanthus 

 cornutus (Bronn). 



Family 10. CHONDRACANTHIDAE. 



Female without segmentation and with paired blunt projections rep- 

 resenting the appendages, with long egg sacs; male very small, seg- 

 mented, with 2 pairs of legs, and attach themselves to the body of the 

 female: about 40 species. 



Chondracanthus Delaroche. Second an- 

 tennae form short, stout hooks: about 20 species, 

 parasitic on the gills of marine fish. 



C. cornutus (0. F. Muller) (Fig. 554). Body 

 of female elongate, 6 mm. long; length of male 

 .3 mm.: on the gills of the Pleuronectidae. 



Family 11. LERN^OPODIDAE.* ' 



Body consists of a head and a thorax; an- 

 tennae small ; first two pairs of legs long and 

 forming the organs of attachment; other legs 

 wanting; male minute and attached to the body 

 of the female; female with 2 thick egg sacs: 

 about 60 species. 



Leenjeopgda Blainville. Head somewhat smaller than the thorax, 

 which is slender and not segmented : about 9 species ; in fresh and salt water. 



L. f ontinalis S. I. Smith. Length of female 4 mm. : on brook trout 

 in Maine. 



Suborder 2. BRANCHIURA. 



Parasitic eopepods with a flattened body consisting of a disc-like 

 cephalothorax, on the dorsal surface of which is a pair of large com- 

 pound eyes, with a thorax of 3 free segments, and an unsegmented, 

 2-lobed abdomen; antennae small; mouth parts consisting of a pro- 

 boscis containing 2 serrate mandibles and 1 pair of slender maxillae; in 

 front of the mouth is usually a poisonous sting projecting from a sheath, 

 into which it can be withdrawn; a large sucker usually present on each 

 side of the proboscis and just behind it a pair of short uniramose append- 

 ages, the suckers and the appendages representing the 2 branches of the 

 second maxillae; 4 pairs of large biramose legs; no egg sacs, the eggs 

 being deposited on stones and other objects; the animals leave their 

 hosts occasionally and swim about freely : 1 family and about 37 species. 



Family ARGULIDAE.f 

 With the characters of the suborder: 1 American genus. 



* See "North Am. Parasitic Copepods of the Family Lernaeopodidae," etc., by 

 C. B. Vl'ilson, Proc. U. S. Nat. Mus., Vol. 47, p. 565, 1915. 



t See "North Am. Parasitic Copepods of the Family Argulidae," etc., by C. B. 

 Wilson, Proc. U. S. Nat Mus., Vol. 25, p. 635, 1903. 



