112 Part III — 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 Pseudophcenna, G. 0. Sars (1900). 



Pseudophcenna 1 typica, G. O. Sars. PL ii., figs. 11-15. 



1902. Pseudophcenna typica, G. 0. Sars. An Account of the 

 Crustacea of Norway, vol. iv., p. 44, pi. xxix., xxx. 



A single male specimen of a Calanoid, which I have referred, though 

 somewhat doubtfully, to Pseudophcenna typica, G. 0. 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 Pseudophcenna 

 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 thoiax 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, bat 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 Yardo, and 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. vL, figs. 13-15. 



1873. Pseudocyclops obtusatus, B. and R. ; Ann. and Mag. Nat. 



Hist. (4), vol. xii., p. 128, pi. viii., figs. 4-7. 

 1878. Pseudocyclops obtusatus, Brady, Mon. Brit. Copep., vol. i., 



p. 84, pi. 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. S. 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 setae ; 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 setae on the 



