of the Fishery Board for Scotland. 453 



The abdomen is narrow and short, being scarcely more than a fifth of 

 the entire length of thorax and abdomen. 



The caudal furca are very short. No furcal seta3 arc sho'.vn in the 

 figure, a.s they had all been broken oft". 



The fifth pair of thoracic feet are of moderate size, the first joint is 

 equal to rather more than half the length of the second one, and is 

 slightly gibbous on the interior aspect, the inner margin is also densely 

 fringed with minute hairs ; the second joint is slightly distorted, being 

 bent inward somewhat abruptly near the middle ; this joint is armed with 

 three moderately stout setiferous terminal spines, and is also furnished 

 with a few minute setaj on the lateral aspect and near where the joint 

 is bent as shown in the draAving (fig. 9). 



The occurrence of Xanthocalanus boreaUs in the neighbourhood of the 

 Shetland Islands adds another species to the copepod fauna of Scotland. 

 The distribution of this species appears to be somewhat restricted, as, 

 with the exception of a single young female obtained in a gathering 

 collected north of the JSlew Siberian Islands, Prof. Sars has only found it 

 in Stavanger Fjord, and in a few other places off the west coast of 

 Norway, but its occurrence in this Shetland gathering seems to indicate 

 that it may after all have an extensive distribution. 



Phienna '/.etlandica, sp. n. PI. XXII., figs. 5-7. 



A male specimen of a {I) Plurnna, which I have provisionally 

 named P. zetlan<U<'a, was obtained in the same gathering with the 

 Xantliocalanus just described, agrees in some respects very closely 

 with Phcenna spinifera, Claus, and may probably be only a form 

 of that species. The specimen (fig. 5) measures nearly two and a 

 half millimetres (yl^ of an inch) in length. The thorax is moderately 

 robust, and when seen from above is broadest behind the middle. The 

 ceplialo-thoracic segment, which is about equal to half the entire length of 

 the animal, tapers gradually to the broadly rounded forehead, the next- 

 three thoracic segments are short. The abdomen is narrow, and its 

 length is equal to little more than a third of that of the cephalo-thorax ; 

 it consists of five segments, the genital segment is slightly longer than 

 any of the others, the last is very short ; the caudal furca are very short 

 (the furcal hairs are not shown, as they had accidentally been broken off). 



The antennules, which appear to be the same on both sides, do not 

 reach to the end of the abdomen, the first six joints are short, the seventh, 

 eighth, and ninth are partly coalescent, the tenth to the fifteenth joints, 

 which are of moderate length, are sub-equal, the seventeenth joint is also 

 nearly equal to these in length, but the remaining joints are rather shorter ; 

 the antennules are only sparingly setiferous, as shown by the drawing 



(fig- 5). 



The fifth pair of feet, in which both branches are developed, are very 

 similar to those of Phonna spinifera, Claus. The right branch is elon- 

 gated and slender and composed of four joints, the first three are of nearly 

 equal length, but the last is about one and a half times the length of the 

 preceding joint and considerably attenuated so as to resemble a spine 

 rather than a joint (fig. 6). The left branch is rather longer than the 

 right one and apparently five-jointed ; the terminal portion of this branch 

 consists of two appendages, the inner one being short and moderately 

 broad, rounded at the end and fringed with seta?, the other is narrow and 

 longer than the inner one and forms with it a kind of finger and thumb- 

 like arrangement, as shown in figure 7. 



The fifth thoracic feet of this Shetland specimen are seen to differ 



