of the Fishery Board for Scotkuid. 



279 



setae (fig. 20). The abdomen coiiaists of three scgmeiiLs ; the genital 

 segment is large, while the tliird is shorter than the penultimate one ; 

 caudal stylets very short (fig. 21). We have not yet observed the male 

 of this Copepod. 



Eurynotus insolens, T. and A. Scott (PI. XA^., figs. 25-34). 



1898. Eurynotus insolens, T. and A. Scott, ' Ann. and IMag. 

 Nat. Hist.,' ser. 7, vol. i. p. 188, PI. X., fig. 17; and 

 PI. XL, figs. 5-13. 



This curious parasite — for that it is parasitic on some creature is 

 evident by the structure of the mouth-organs — was discovered among 

 some trawled refuse from Kilbrannan Sound, Firth of Clyde, in 1886. 

 The thorax is broad and somewhat ovate, it is large in comparison with 

 the abdomen, and seen from above is indistinctly divided into two 

 segments, the junction of which is indicated by a slight constriction on 

 each side (fig. 25). The antennules (fig. 26) are short and seven-jointed, 

 and taper gradually from the moderately stout base ; the second joint is 

 much longer than any of the others, and bears a long plumose seta at the 

 distal end of the lower margin. The antenn?e (fig. 27) are stout, and 

 apparently four-jointed, and furnished with a series of peculiar terminal 

 hairs, some of which are distinctly hooked at the ends, and two of them 

 terminate in what seem to be circular disks, as shown by the figure ; the 

 antennai do not appear to possess secondary appendages. The mandibles 

 (fig. 28) are simple, elongate, and slender organs, which terminate in 

 hook-like extremities ; they are each provided with two long marginal 

 setae near the middle (figs. 29 and 30 show the rudimentary structure of 

 the maxillae and anterior foot-jaws). The posterior foot-jaws (fig. 31) 

 appear to be two-jointed ; the first joint is dilated interiorly so as to 

 assume a somewhat gibbous form, and a considerable portion of the 

 gibbous surface is clothed with minute spines ; the end- joint is very 

 small, and bears three terminal setse of unequal length. There are only 

 three pairs of thoracic feet, the fourth and fifth being apparently obsolete ; 

 and while the first and second pairs are both three-branched, the third 

 pair appears to be only one-branched (figs. 32, 33). There is a large and 

 prominent circular disk-like appendage situated between and a little in 

 front of the mandibles ; this appendage is probably used by the Copepod 

 as a sucker for adhering to the creatures that form its host. The male 

 is so far unknown. Eurynotus insolens appears to be a rare species. The 

 generic name — Eurynotus — which has been given to this Copepod was 

 suggested by the broadly ovate form of the thorax, eurynotus being 

 a slightly modified form of the Greek word signifying " having broad 

 shoulders." 



CHONIOSTOMATID.E. 



Aspidoecia normani, Uiard and Bonnier. Last year 1 recorded the 

 curious Erythrops parasite Asjndophryxus imltatus from the Clyde. I 

 have now to report the occurrence in the Clyde of another curious parasite 

 of Erythrops — viz.., Aspidoecia normani. I have on one or two previous 

 occasions observed what looked like rounded tubercles on the back and. 

 sides of odd specimens of these Schizopods without knowing what they 

 were. A perusal of Dr. H. J. Hansen's monograph of the Glioniostoma- 

 tidce, however, showed at once their true character. 



In concluding these notes, I may state that there are one or two 

 crustacean species still unidentified, and that have consequently to stand 

 over for the present. 



