258 



Part III. — Seventeenth Annual Report 



the case. The incurved position of the posterior portion of the abdomen 

 and caudal furca is also a more or less constant feature in this species 

 so far as regards all the specimens examined. Except for the somewhat 

 abnormal form of the fifth pair of feet, the species appears to be a typical 



Cletodes. 



Dactylopus tenuiremis, Brady and Robertson. 



1895. Dactylopus tenuiremis, Brady and Robertson, Brit. Assoc. 

 Report, p. 197. 



This apparently rare species occurred in the shore gathering collected to 

 the east of Invergordon, Cromarty Firth, in November 1897. There is 

 no previous record of Dactylopus tenuiremis from the Moray Firth district. 

 It is a somewhat critical species, but appears to be distinct. 



Dactylopus minutus, Claus. 



1863. Dactylopus minutus, Claus, Die frei-lebenden Copep., 

 p. 126, PI. XYI., figs. 14-15. 



This Dactylopus occurred amongst a number of other things in a 

 gathering from Station VI. (Firth of Clyde) collected 1st September 1898. 

 It is a comparatively small species and appears to be rare. 



Thalestris helgolandica, Claus. 



1863. Thalestris helgolandica, Claus. Die frei-lebenden Copep., 

 p. 131, PI. XVII., figs. 12-21. 



This rare species was obtained in a bottom tow-net gathering from 

 Station IV. (Kilbrennan Sound, Firth of Clyde) on 24th August 1898. 

 The Rev. A. M. Norman has also obtained Thalestris helgolandica in the 

 Firth of Clyde. This species of Thalestris, as well as Thalestris hibernica, 

 has been found recently in some material dredged in 1886 a little to 

 the west of Invergordon, Cromarty Firth, but both appear to be scarce. 



Cylindropsyllus fairliensis, sp. n. (PI. X., figs. 11-14; PI. XL, figs. 1-4). 



Description of the Female. —The body is elongate, slender, and cylindri- 

 cal. The length of the specimen figured is l"73mm. (nearly j 1 - of an 

 inch). The thorax is composed of five distinct segments, the first of which 

 is rather longer than the combined lengths of the next two, but the 

 second to the fifth are sub-equal The abdomen is also composed of five 

 distinct segments ; the first to the fourth are of nearly the same length as 

 the posterior thoracic segments, the last being about one and a half times 

 the length of the penultimate segment. The caudal furcse are short and 

 broad ; the interior half of the apex of each is somewhat produced and 

 bears a long and moderately stout seta and two or three small hairs ; the 

 exterior portion of the apex is abruptly concave, the concavity being 

 bounded externally by an acute angle, and interiorly by the produced 

 setiferous portion just referred to and as shown in the figure (fig. 6, PI. 

 XL). The rostrum is snort. The antennules are moderately short and 

 stout, eight-jointed ; the first four joints are larger than the last four, a 

 stout asthetask springs from the produced upper angle of the fourth joint; 

 the fifth joint, which is smaller than any of the others, is only about half 

 the length of the preceding one ; the next three are sub-eqnal and some- 

 what longer than the fifth (fig. 1, PI. XL). The formula shows approxi- 

 mately the proportional lengths of all the joints — 



Numbers of the joints, \-2'S'i'5'6'7'8 

 Proportional lengths of the joints, 22 • 15 • 16 • 12 ' 6 * 10 ' II ■ 10 



