128 Part I71.—Twenty-jirst Annual Report 
Dactylopus coronatus, T. Scott. 
1894. Dactylopus coronatus, T. Scott. Twelfth Ann. Report 
Fishery Board for Scotland, pt. ii., p. 255, pl. ix., figs. 
12-20. 
This Dactylopus was obtained very sparingly in material dredged in 
shallow water off Musselburgh ; it has been already taken near the Bass 
Rock and in Largo Bay, but is nowhere very common. 
Dactylopus brevicornis, Claus. 
1866. Dactylopus brevicornis, Claus. Die Copepoden fauna 
von Nizza, p. 29, t. ili., figs. 20-25. 
1880. Dactylopus brevicornis, Brady. Brit. Copep., vol. ii, 
p. 118, pl. lvii., figs. 10-12 ; Iviii., fig. 14. 
Several specimens of this small species were obtained in the old 
quarry near Granton, Firth of Forth. It appears to be a littoral form, 
but is found also in moderately deep water, and has been recorded from 
several places round the Scottish coasts, but usually very sparingly. 
Among other Dactylapus from the same gathering was the well-marked 
D. flavus, Claus, and one or two other common forms. 
Dactylopus debilis, Giesb. PI. v., figs. 20-31. 
1882. Dactylopus dedilis, Giesb. Freileb. Copep. d. Kieler 
Fohrde, p. 122, pl. i., figs. 7, 19 et. seg. 
Description of the Female.—Body slender, and, in spirit specimens, 
strongly reflexed (fig. 20). The length of the specimen represented by 
the drawing is only slightly over half a millimetre (about =); of an inch). 
The rostrum is moderately prominent, but the furcal joints are very short 
fig. 31). 
The antennules are of moderate length and composed of eight joints, 
the first four large but the others considerably smaller (fig. 21). The 
proportional lengths of the various joints are shown approximately by the 
annexed formula :— 
Proportional lengths of the joints, 18 +17 -13°18*:6:+8-6-11 
The numbers of the joints, - Do Dep id AS sh MOUS ej iieemnS 
Antenne short, moderately stout, two-jointed, and furnished with a 
three-jointed secondary branch (fig. 22). 
Mandibles small, the biting edge armed with a number of small teeth ; 
the basal joint of the palp is dilated and bears two small brarfches as 
shown in the drawing (fig. 23). 
The second maxillipeds are moderately slender, so also is the elongated 
terminal claw with which they are armed (fig. 24). 
The first pair of thoracic feet are somewhat similar to those of Dacty- 
lopus minutus, Claus ; the first joint of the inner branches is long and 
slender, being about three times longer than the combined lengths of the 
second and third joints, and it is furnished with a small seta near the 
distal end of the inner margin; the terminal claw of the inner branches is 
moderately stout, and there are also two terminal sete. The outer 
branches, which are also slender, are rather shorter than the first joint of 
the inner ones (fig. 25). 
The next three pairs are also slender and resemble each other, except 
in the following particulars :—In the second pair the inner branches are 
slightly longer than the outer, and while the last joint of the inner 
branches is provided with a seta on the inner margin, the end joint of the 
outer branches has no seta similarly situated. In the third pair the inner 
