128 Part III. — Twenty-first Annual Report 



Dactylopus coronatus, T. Scott. 



1894. Dactylopus coronatus, T. Scott. Twelfth Ann. Keport 

 Fishery Board for Scotland, pt. iii., p. 255, pi. 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. iii., figs. 20-25. 

 1880. Dactylopus brevicornis, Brady. Brit. Copep., vol. ii., 



p. 118, pi. lvii., figs. 10-12 ; lviii., 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 Dactylopus 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 debilis, Giesb. Freileb. Copep. d. Kieler 

 Fohrde, p. 122, pi, i., figs. 7, 19 et. seq. 



Description of the Female. — Body slender, and, in spirit specimens, 

 strongly refiexed (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, - 1*2'8'''4 , 6'6' , 7"8 



Antennae 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 branches 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 setae. 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 



