276 Part 111 —Twenty-fourth Annual Report 
Both branches of the other three pairs are also three-jointed, elongated 
and slender, the inner branches being rather shorter than the outer, as 
shown in the drawing which represents the fourth pair (fig. 7). 
Fifth pair tolerably large and foliaceous; basal joint somewhat 
triangular in outline, the distal half of the inner margin which slopes 
towards the apex is provided with three stout sete, the inner margin is 
nearly straight and terminates in an angle, and immediately posterior to 
this angular tooth are two apical sete, which are separated from the 
lowermost of the three on the inner margin by a distinct hiatus, as in the 
drawing. Secondary joint subquadrangular, its width being equal to 
nearly two-thirds of the length, the outer and inner margins are nearly 
parallel at the proximal end, but they taper from about the middle of the 
joint towards the apex and there are three setz on the outer margin, one 
on the lower inner margin and two on the apex, as shown in the drawing 
(fig. 8). 
hee joints very short (fig. 9). Principal tail sete slender. Two 
ovisacs. Male unknown. 
Habitat.—Granton, Firth of Forth ; dredged in an old quarry to which 
the tide has access. Apparently rare. 
Remarks.—In some respects Amphtascus Catherine comes very near 
Amphiascus (Dactylopus) minutus, Claus., as described and figured by G,. 
O. Sars,* but the form and armature of the fifth pair of thoracic feet are 
totally different. Other but less obvious differences are also noticeable, 
as, for example, in the form and armature of the mandible-palp, the 
armature of the outer and inner branches of the fourth pair of thoracic 
legs and in the hirsute character of the first two abdominal segments. 
Unfortunately I have been unable to obtain the male of this form, but 
owing to the differences mentioned I prefer meantime to regard this as a 
distinct form from A. minutus. 
Genus Dactylopusia, A. M. Norman (1903). 
Dactylopusia brevicornis (Claus). Pl. xiv., figs. 10-18. 
1866. Dactylopus brevicornis, Claus., Die Copepoden-fauna von 
Nizza, p. 29, Taf. iii., figs. 20-25. 
1905. Dactylopusia brevicornis, G. O. Sars, Crust. of Norway, 
vol. v., p. 130, pl. lxxx. 
The female of this species, like that of some others of the same group, 
has the cephalothorax depressed and broadly ovate, but the abdomen is 
comparatively narrow (fig. 10). Rostrum short, with a broadly rounded 
apex. Length ‘77mm. (,), of an inch). 
Anterior antennze composed of five joints, very short and stout; the 
first three are more robust than the remaining two joints, the end joint is 
fully twice as long as the penultimate one (fig. 11). The formula shows 
the proportional lengths of the various joints as follows :— 
Proportional lengths of the joints, - 18°12°16°6:17 
Numbers of the joints, = - - See poo vA Earby 
Posterior antenne stout, two-jointed, with a short three-jointed outer 
ramus (fig. 12). 
Mandibles stout, with an obliquely truncate apex, which is armed 
with a few large and several small teeth. Mandible palp with a dilated 
basal part bearing two very short uniarticulate branches (fig. 13). 
* Crustacea of Norway, vol. v., p. 154, pl. xevi, (March 1906). 
