apparently new Oopepods from the Clyde. 187 



different from the same appendages in Stephos yninor, T. Scott, 

 and Stephos pyrans (Giesbrecht), and are in themselves quite 

 sufficient to distinguish it from those two species ; moreover, 

 it has to be noted that the fifth pair of thoracic feet in the 

 female are scarcely symmetrical, and to that extent they 

 indicate a departure from the normal characters of the genus. 



Dactylopus pecti'natus, sp. n. 

 (PI. X. tigs. 9-16.) 



Description of the Female. — In general appearance this 

 species is somewhat similar to Dactylopus Stromii; the 

 animal is moderately robust, and the length of the specimen 

 figured is about "7 millim, {-^-^ of an inch). The antennules 

 are short and seven-jointed ; the first four joints are stout and 

 subequal in length, but the remaining three are much smaller 

 (fig. 10). The antennff! are short and stout, and the small 

 secondary branches are two-jointed, the end joint being shorter 

 than the other (fig, 11). The mandibles and maxiUai are 

 somewhat similar to those of Dactylopus rostratas, so also are 

 the anterior foot-jaws. The posterior foot-jaws are stout and 

 the terminal claws are provided with a fringe of elongate 

 spinules arranged along the inner margin in a pectinate 

 manner, as shown by the figure (fig. 13). The first pair of 

 swimming-feet are moderately stout; the outer branches, 

 which are considerably shorter than the inner, have the first 

 two joints subequal ; the end joint is shorter than either of 

 the other two, being little more than half the length of the 

 second ; the marginal spines of the three joints are stout and 

 ciliated ; the first joint of the inner branches is about one 

 and a half times the entire length of the outer branches, and 

 the end joint, which is very short, is armed with a stout claw, 

 having a comb-like row of elongate spinules along the exterior 

 edge somewhat similar to those on the terminal claw of the 

 posterior foot-jaws ; the inner branches appear to be only 

 two-jointed (fig. 14). The following three pairs of swimming- 

 feet are somewhat similar to those of Dactylopus rostratus 

 (fig. 15). In the fifth pair the inner produced part of the 

 basal joint is broadly rounded and provided with five terminal 

 setaj, four of which are moderately elongate, and one — the 

 second from the inside — very short ; the secondary joint is 

 ovate in outline and about one and a half times longer than 

 broad, and is furnished with six moderately long setaj — one 

 on the inner margin, three on the outer margin^ and two, 

 somewhat longer than the others, at the apex (fig. lU). The 

 caudal stylets are shorter than the last abdominal segment. 



Male unknown. 



Ilab. Near the head of Loch Fyne : apparently rare. 



10* 



