NO. 2063. AORTH AMERICAN PARA.SITIC COPEPODti—WILHON. 705 



together, the basal joint much longer than mde, the terminal claw 

 sharply bent. 



Color the same as that of the female. 



Total length, 2.25 mm. Greatest diameter, 0.5 mm. 



{thynni, the generic name of the host.) 



Remarlcs. — This species is one of the largest of the genus, and was 

 first described by Cuvier, who made it the type-species of his new 

 genus Brachiella. Since then it has been described or noticed by 

 almost every wiiter on the parasitic copepods, and always urnler the 

 same name, with one exception. Miculicich, supposing it to be new, 

 gave a long account of it with text figures ^ and named it Thynnicola 

 ziegleri. This mistake he himself corrected in March, 1905, in the 

 same periodical. But in spite of the fact that it is so universally 

 known, there are still several things in connection with its structure 

 that need either correction or further description. For this reason 

 the above account has been given, with such figures as seemed nec- 

 essary. The facts here estabhshed are : 



1. The body of the female is as fully segmented as that of AcMheres, 

 and the segmentation is similarly indicated. 



2. The head is covered with, a well-defined dorsal carapace. 



3. The neck is separated from the trunk by a groove behind the 

 second maxillae. 



4. There is no genital process. 



5. The second antennae are biiamose, the exopod (ventral ramus) 

 being rudimentary. 



6. The first maxillae liave a palp at right angles to the body of the 

 appendage. 



7. The maxiUipeds are widely separated. 



BRACHIELLA GULOSA, new species, 

 Plate 53, figs. 216 to 220; plate 54, figs. 221 to 224. 



Host and record of siJecimens. — Three lots of this parasite were ob- 

 tained by Dr. Hugh M. Smith from the under surface of the operculum 

 of the channel bass, Scienops ocellatus, from the Center Market at 

 Washington, District of Columbia. The first lot, ten females and 

 two males, were captured off Elizabeth City, New Jersey, and were 

 given Cat. No. 43588, U.S.N.M. The second lot, eighteen females 

 and four males, w^ere captured off the North Carolina coast, and have 

 received Cat. No. 39578, U.S.N.M. The third lot, five females and 

 one male, were captured near Morehead City, North Carolina, and 

 bear Cat. No. 39580, U.S.N.M. A single female with attached male 

 has been taken from the first lot and given Cat. No. 43585, U.S.N.M., 

 as the type of the new species. Ten females and one male were 

 taken off New- York City, September 1, 1901, by Mr. Blackford; they 



' Zool. Anz. for Sept., 1904. 

 34843°— Proc.N.M.vol.47— 14 45 



