NO. 2063. 



j\'ORTH AMERICAN PARASITIC COPEPODS—WILSOX. 703 



10. Ventral and dorsal processes the same distance apart; no genital process; second 



maxillae smooth sciaenophila Heller, 1865. 



11. Trunk smooth; second maxillae much longer than cephalothorax ; first antennae 



three-jointed ffracilis Wilson, 1908, p. 712. 



11. Trunk smooth; second maxillae much shorter than cephalothorax; first antennae 



three- jointed; genital process long and club-shaped . j-uZosa, new species, p. 705. 

 11. Trunk smooth; second maxillae very short; first antennae three-jointed; genital 



process long and cylindrical merluccii Bassett-Smith, 1896. 



11. Trunk with two rows of pits or grooves on the dorsal and ventral surfaces; second 



maxillae short; first antennae four-jointed; no genital process. 



elegans Richiardi, 1880, p. 707. 



12. Trunk wider than long; dorsal processes abruptly curved near their tips. 



chavesii Beneden, 1891. 



11. Trunk longer fhan wide; dorsal processes straight; two rows of pits on the dorsal 



and ventral surfaces of the trunk thynni Cuvier, 1830, p. 703. 



BRACHIELLA CONCAVA Wilson. 

 Brachiella concava Wilson, 1913, p. 262, pi. 51. 



Host and record of specimens .—A single female with e^g strings was 

 taken from the gill arch of a sting ray, Dasyatis hastata, at Montego 

 Bay, Jamaica, August 10, 1910. Jhis was made the species type and 

 received Cat. No. 42286, U.S.N.M. 



Remarlcs.— This species was fully described and figured in the 

 reference above given. It is not common, but may be recognized by 

 the size and shape of the posterior processes and the absence of a 

 genital process. But these posterior processes are dorsal and not 

 ventral, and are only found in one other species, lophii, which prob- 

 ably does not belong to the present genus, as already stated (p. 700). 

 That throws the burden of proof on the present species if it is to 

 remain in the genus, but this can not be decided fully until the 

 male is found. When that occurs it is very possible' that the species 

 will be transferred to the genus Charopinus. 



BRACmELLA THYNNI Cuvier. 



Plate 25, fig. C; plate 53, figs. 209 to 215. 



Brachiella thynni Cuvier, 1830, p. 257, pi. 15, fig. 5. 

 Thynnicola ziegleri Miculicich, 1904, p. 47. 



Host and record of specimens.— A single female with egg strings was 

 taken from the gills of a tunny fish at Cornwall, England, and sent 

 to the United States National Museum by Kev. A. M. Norman. It 

 was numbered 8342, U.S.N.M. Twenty-five females and four males 

 were obtained from the giUs of Thynnus thynnus at Bakar, Croatia, 

 Hungaiy, by Prof. S. Brusina. They have received Cat. No. 43458' 

 U.S.N.M. 



Specific characters o//€waZe.— Cephalothorax as long as the trunk, 

 cylindrical, and usually bent sHghtly backward; head Httle if any 

 enlarged, but covered with a distinct dorsal carapace; neck the same 

 diameter throughout, and separated from the trunk by a well-defined 



