of the Fishery Board for Scotland. 255 
Habitat.—Off Limekilns, west of Queensferry. Washed from lumps of 
hardened mud. Not very common. 
This species appears to be extensively distributed throughout the 
British Islands. 
Dactylopus coronatus, sp. n. (Pl. IX. figs. 12-20.) 
Description.—Female. Length, ‘57 mm. (;,th of an inch). Body 
moderately robust. Anterior antennz short, stout, six-jointed, and bear- 
ing numerous elongate and stout, plain, and spinulose sete (fig. 13). The 
ante-penultimate joint is rather shorter than any of the others, and bears 
a long stout filament. The formula shows the proportionate lengths of 
the joints :— 
131902 12+ 8 1 AO 
Posterior antenne short and stout. Secondary branch two-jointed, strongly 
setiferous. Mandibles somewhat like those of Dactylopus tisboides, Claus. 
The biting part is armed with a broad trifid tooth, two spiniform teeth, 
and a few setiferous spines (fig. 15). Posterior foot-jaws robust. A strong 
setiferous spine springs from the inner distal angle of the first joint. 
Terminal claw stout, curved, scarcely equal in length to the joint from 
which it springs. Both joints are furnished with rows of cilia, asshown in 
the figure (fig. 16). All the swimming-feet are short and stout, but those 
of the first pair are more robust than the others. The first joint of the 
inner branches of the first pair is considerably dilated, and longer than 
the next two together, and furnished with a plumose seta near the middle 
of the inner margins. The second and third joints are sub-equal, and much 
narrower than the first joint. The second joint bears a seta similar to that 
of the first joint. The third joint bears a small marginal plumose seta, a 
terminal plumose seta, and two elongate curved terminal spines. The 
outer branches are nearly equal to the length of the first two joints of 
the inner branches. The first two joints are sub-equal, but the last is only 
about two-thirds the length of the preceding one (fig. 17). The middle 
joint of the outer branches is furnished with a long plumose seta near the 
end of the inner margin. The spines on the outer margins of the first and 
second joints are moderately stout and setiferous. The outer one of the 
five terminal spiniform setz is about the same length as the marginal 
spines, but the others become gradually more elongate, so that the inner 
one is fully three times the length of the outer (fig. 17). The inner 
branches of the second, third, and fourth pairs are shorter than the outer 
branches, and both are furnished with several plumose setz on the inner 
margins, while the outer margins are strongly ciliate. The marginal spines 
of the outer branches are all more or less setiferous (fig. 18). The fifth 
pair are each indistinctly two-branched (or two-jointed) and foliaceous. 
The joints are sub-equal, and are each furnished with five stout plumose setze 
of various lengths round the distal end. Caudal stylets short. One ovisac. 
Habitat.—Among dredged material from the Rath ground in the 
vicinity of the Bass Rock; also in dredged material from Largo Bay. 
Not common. 
Remarks.—The structure and armature of the anterior antenne are 
alone sufficient to distinguish this from other species of Dactylopus. 
Genus Thalestris, Claus (1863). 
Thalestris forficuloides, T. and A. Scott. (Pl. X. figs. 13-25.) 
1894. Thalestris forficuloides, T. and A. Scott (31), p. 142, pl. 
ix. figs. 4—9. 
Description.—Female. Length, 73 mm. (4th of an inch). Anterior 
