112 Part IIT. —Twenty-first Annual Report 
have been defective, as no such difference was observed in Clyde speci- 
mens. The Clyde is, so far, the only known British habitat for this 
interesting species. 
Genus Psewdophenna, G. O. Sars (1900). 
Pseudophenna? typica, G. O. Sars. PI. ii., figs. 11-15. 
1902. Pseudophenna typica, G. O. Sars. An Account of the 
Crustacea of Norway, vol. iv., p. 44, pl. xxix., xxx. 
A single male specimen of a Calanoid, which I have referred, though 
somewhat doubtfully. to Psewdophenna typica, G. O. Sars, was obtained 
in a bottom tow-net gathering of Crustacea collected last year near the 
head of Loch Fyne. The specimen agrees very closely with Pseudophenna 
typica in its general outline and in the structure of the various appendages 
so far as these can be made out, except that the fifth feet slightly differ 
from the drawing given in the work of Prof. G. O. Sars referred to above, 
but not so much in their general structure as in the apical part of the 
right leg (fig. 15). 
This Loch Fyne specimen measures fully one and a half millimetres ; 
the thorax is moderately stout, but the abdomen is slender (figs. 11 and 12). 
The antennules, which reach to about the distal end of the thorax, appear 
to be composed of twenty-one joints. The basal joints, from the third to 
the seventh, are shorter than the others ; the right is elongated and appears 
to be indistinctly articulated near the distal end. The antennules are 
only sparingly setiferous, but they are well supplied with sensory filaments 
as shown in the drawing (fig. 13). The species will not be satisfactorily 
determined till more specimens of both sexes are obtained. 
In his note on the distribution of this Calanoid, Sars states that he has 
obtained it at several places, from Christiania Fjord to Vard6, aud that it 
is a true bottom form, it is therefore probable that the species may not be 
rare in the deeper water off the Scottish coast. 
Genus Pseudocyclops, G. S. Brady (1872). 
Pseudocyclops obtusatus, Brady and Robertson. PI. vi., figs. 13-15. 
1873. Pseudocyclops obtusatus, B. and R., Ann. and Mag. Nat. 
Hist. (4), vol. xi., p. 128, pl. viii., figs. 4-7. 
1878. Pseudocyclops obtusatus, Brady, Mon. Brit. Copep., vol. 1., 
p. 84, pl. xii, figs, 1-13. 
Although the distribution of this species seems to be extensive, it does 
not appear to be anywhere very common. The female represented by the 
drawing (fig. 13) was obtained during the past summer by washing the 
filters at the Hatchery, Bay of Nigg. The species, which is fairly well 
marked, has been described by Brady and Robertson in the Annals and 
Magazine of Natural History, and by Prof. G. 8. Brady in his Monograph 
of the British Copepoda. 
In this species the rostrum is of a somewhat broadly triangular form 
and the antennules (fig. 14) are short and moderately stout, and are 
apparently composed of seventeen joints and are furnished with numerous 
plumose setz ; the basal joint also carries two moderately long sensory 
filaments. 
The outer branches of all the thoracic feet are armed with stout dagger- 
like spines on their outer aspect. The inner branches of the fifth pair 
are considerably shorter than the outer ones, and the end joints terminate 
abruptly, as shown in the figure; moreover, the marginal sete on the 
