124 Part III. — Twenty-first Annual Report 



Genus Nannopus, Brady (1880). 



Nannopus palustris, Brady. 



1880. Nannopus palustris, Brady, Mon. Brit. Copepoda, vol ii., 



p. 100, pi. lxxvii., figs. 18-20. 

 1902. Nannopus palustris, T. Scott, 20th Ann. Kept. Fishery 



Board for Scotland, pt. iii., p. 466, pi. xxiii., figs. 13-25. 



This somewhat rare species was observed very sparingly in the gathering 

 from the old quarry near Granton in which several other interesting 

 forms have been obtained, and it also occurred in a hand-net gathering 

 of small Crustacea collected between tide marks at Musselburgh. 

 Nannopus palustris appears to be a true littoral or brackish- water species, 

 and is rarely met with in deep water off shore. Another species with a 

 somewhat similar habitat to Nannopus, viz. Palatychelipus littoralis, G. S. 

 Brady, was also obtained in the vicinity of Musselburgh, where it was 

 observed in 1892,* and was then new to the Scottish coasts. It is now 

 ascertained that the species has a wide distribution, but it does not appear 

 to be anywhere very common. 



Genus Dadylopus, Claus (1863). 



Dadylopus Uttoralis, T. Scott, sp. nov. PL iii., figs. 2-8. 



Description of the Female. — Body moderately slender, rostrum short 

 (% 2). 



Antennules (fig. 3) short and composed of eight joints, the third is 

 shorter than the one which precedes or follows, the fifth and seventh 

 joints are small, while the last is about as long as the combined lengths 

 of the sixth and seventh. The proportional lengths of the various joints 

 are shown approximately by the formula : — 



8 • 11 • 9 • 11 • 4 • 6 * 4 • 9 



The second maxillipeds are stout with a moderately stout terminal 

 claw, a somewhat long spine-like seta springs from the inner aspect and 

 near the distal end of the second joint, but, with the exception of another 

 small hair, this joint appears to be devoid of armature of any kind. The 

 first joint is provided with two or three small spine-like hairs at the distal 

 end, while the end joint is almost as narrow as the base of the terminal 

 claw (fig. 4). 



The first pair of thoracic feet are moderately short and stout, the first 

 joint of the inner branches is somewhat longer than the outer branches, 

 but the last two joints are small, and the end one is armed with two 

 terminal spines, one being short and stout, the other longer and setiform; 

 the outer are composed of three sub-equal joints similar to those of the 

 species previously described (fig. 5). 



The second, third, and fourth pairs are moderately elongated, but the 

 fourth is rather longer than the others ; both branches are three-jointed, 

 and the inner branches are shorter than the outer ones ; the marginal 

 spines of the outer branch are moderately long and slender, and the setse 

 on both branches elongated and plumose (fig. 6 represents the fourth 

 pair). 



The fifth pair are moderately broad and foliaceous, especially the outer 



* Tenth Annual Report of the Fishery Board for Scotland, Part III., p. 205, pi. v., 



figs. 11-13 (1893). 



