124 Part ITT.— Twenty-first Annual Report 
Genus Nannopus, Brady (1880). 
Nannopus palustris, Brady. 
1880. Nannopus palustris, Brady, Mon. Brit. Copepoda, vol i ty 
p. 100, pl. Ixxvil., figs. 18-20. 
1902. Nannopus palustris, T. Scott, 20th Ann. Rept. ister 
Board for Scotland, pt. 11., p. 466, pl. xxii, figs. 138-25. 
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 Vannopus, 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 Dactylopus, Claus (1863). 
Dactylopus littoralis, T. Scott, sp. nov. PI. iii., figs. 2-8. 
Description of the Female.—Body moderately slender, rostrum short 
fig, 2), 
; Nee ee (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 :— 
gasps 9) equ Ae AWG Cede SEM 9 
Lip Dye) Blew eee) bes 6s eee 
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 setz 
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 Hee y Board for Scotland, Part III., p. 205, pl. v., 
figs. 11-13 (1893), 
