674 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.47. 



body and egg strings when compared with the second maxillae and 

 cephalothorax. 



CLAVELLA TUMIDA, new species. 

 Plate 45, figs. 144 to 147; plate 46, fig. 148. 



Host and record of specimens. — A single female without egg strings, 

 but with two attached males, was obtained from the gills of the tom- 

 cod, Microgadus tomcod at Harpswell, on the Maine coast, July 17, 

 1903. It of course becomes the type of the new species, and is num- 

 bered 39592, U.S.N.M. 



Specific characters of female. — Cephalothorax swollen, slightly flat- 

 tened dorso-ventrally, and flexed back against the dorsal surface 

 of the trunk so tightly that it makes a groove along the median line 

 of the latter. On either side of this groove the body rises into a 

 ridge, which apparently increases the depth of the groove; head 

 considerably swollen, and covered with a distinct dorsal carapace; 

 trunk flattened dorso-ventrally, oblong, with rounded corners; 

 ventral surface fiat, with a well-defined central ridge of longitudinal 

 muscles; dorsal surface with the two lateral ridges and the central 

 groove as just stated; genital process relatively large, club-shaped, 

 and attached on a level with the ventral surface. First antennae 

 indistinctly three-jointed, the basal joint considerably swollen and 

 attached a long distance inside of the second antennae and close to 

 the mouth tube. Second anteimae imiramose, the basal joints much 

 enlarged and stiffened with a chitin framework, the terminal joints 

 turned inward at right angles across the frontal margin and almost 

 touching at the midline. Mouth tube short, narrow at the base and 

 tip, and swollen through the center; first maxillae tripartite at the 

 tip, the outer ramus very rudimentary; palp also small and armed 

 •with a single seta. Second maxillae practically wanting, only form- 

 ing a bowl-shaped depression in the base of the neck; bulla of medium 

 size, and spherical, fastened to the bottom of the bowl by a short 

 pedicel; maxillipeds small, with a swollen basal joint and a slender 

 terminal claw, bent sharply close to the tip, and armed there on the 

 inner margin with an accessory spine. 



Cephalothorax, 3 mm. long, 0.5 wide. Trunk, 2.5 mm. long, 

 1.25 mm. wide. Genital process, 0.6 mm. long. 



Specific cliaracters of the Tnale. — Body somewhat egg-shaped, but 

 considerably straightened along the ventral margin; mouth tube at 

 the small end and projecting do^vnward and forward at an angle of 

 45° with the body axis; the two pairs of antennae removed a long 

 distance from the anterior margin and close together; first pair three- 

 jointed, the third joint very narrow and more like a swollen seta; 

 second pair with a short basal joint and one-jointed rami, the exopod 

 slightly longer than the endopod and both armed with minute spines; 



