of the Fishery Board for Scotland. 



205 



short, two-jointed, the outer three-jointed branches also short, but rather 

 longer than the inner branches ; exterior marginal spines of the outer 

 branches elongate, slender ; inner and outer branches provided with very 

 long, slender, and blunt-pointed terminal filaments (fig. 25). Inner 

 branches of second, third, and fourth pairs very short, one-jointed ; the 

 intermediate terminal seta of both branches of the second and third pairs 

 very long and sparingly plumose (fig. 26). Intermediate terminal seta of 

 the inner branches of fourth pair not reaching much beyond the end of 

 the outer branches. Fifth pair very small, almost rudimentary ; basal 

 joint furnished with four subequal plain setae, and the secondary joint 

 with five setae of unequal length (fig. 28). Caudal stylets short, their 

 breadth equal to about two-thirds the length ; primary caudal seta equal 

 to the combined length of the last abdominal segment and stylets, the 

 other setae minute. The last four abdominal segments are adorned with 

 three to four transverse rows of minute cilia, and the posterior margins of 

 thoracic and abdominal segments are fringed with aculeate setae, as shown 

 in figure 



Habitat. — Vicinity of Inchkeith. February 1893. Dredged ; rare. 



This species, which is doubtfully referred to Cletodes, differs from that 

 genus in having the inner branches of all but the first pair of the swim- 

 ming feet one-jointed, but as it agrees with Cletodes in most of the other 

 important characters, and as no male has yet been obtained the structure 

 of which might have assisted in more satisfactorily indicating the affinities 

 of the species, it seems better in the meantime to place it in the genus 

 Cletodes. One peculiar character of the species that distinguishes it from 

 almost all others of the genus to which it is referred, is the long terminal 

 filaments of the first pair of feet ; they do not appear to be hairs or seta; 

 in the proper sense, but have rather the appearance of filamentous con- 

 ferva. There can be no doubt, however, that they are organically connected 

 with the first feet, and are not accidental parasitic growths. 



Genus, Platychelijms, Brady (1880). 



Platychelipus littoralis, Brady. (PI. V. figs. 11-13.) 



1880. Platychelipus littoralis, Brady, ' Mon. Brit. Copep.,' vol. ii. 

 p. 103, pi. lxxix. figs. 20-23; pi. lxxx. figs. 15-19. 



Habitat. — Forth estuary, near Culross, and also off Musselburgh. 

 This well marked species was of frequent occurrence in the material 

 collected off Musselburgh. The long, curved, claw-like, and spiniform 

 terminal seta of the inner branches of the first pair of swimming feet (fig. 

 12), together with the Enhydrosoma-\\kQ form of the animal, enable the 

 species to be distinguished almost at first sight. Platychelipus is well 

 described and figured by Dr Brady in the ' Monograph of the British 

 ' Copepoda.' I do not know of any previous record of it from the Scotch 

 coasts. 



Genus, Dactylopus, Claus (1863). 



Dactylopus rostratus, sp. n. (provisional name). (PI. III. figs. 7-20.) 



This copepod, for which I propose the provisional name Dactylopus 

 rostratus, closely resembles Dactylopus flavus, Claus, in some structural 

 details, and may be a large variety of that species. {Dactylopus rostratus 

 is 1 mm. in length, whereas Dactylopus flams is little more than half that 

 size.) But besides being nearly double the size of Dactylopus flavus, it is 

 readily distinguished from that species by the prominent and bluntly- 

 rounded rostrum, which, like Delavalia palustris, is provided with two 

 O 



