15 



P. obtusatus, sharply defined at the base, and somewhat smaller than in female. 

 Right anterior antenna conspicuously hinged, with the middle joints rather 

 tumefied, terminal movable part only composed of 3 joints, the 1st of which 

 is produced at the end anteriorly to a slender spiniform process. Last pair 

 of legs exceedingly strong and massive, being built on a similar type to that 

 in the male P. obtusatus, though exhibiting some minor differences, as seen 

 from the figure here given. 



Body in the living animal highly pellucid and nearly colourless; eye 

 very conspicuous and of a light red colour. 



Length of adult female amounting to 0.86 mm., that of male to 

 0.80 mm. 



Remarks. This form was first described by Prof. Brady in the above 

 quoted journal, and was subsequently briefly recorded by the same author 

 in his well-known Monograph of British Copepoda. It is nearly allied to 

 P. obtusatus, but of somewhat larger size and more robust form of body, 

 differing moreover in some of the anatomical details, as pointed out in the 

 above diagnosis. 



Occurrence. I have only met with this form in a single locality of the 

 Norwegian coast, viz., at Korshavn, where some few specimens were taken 

 from a depth of about 30 fathoms, muddy bottom. 



Distribution. British Isles (Brady). 



Fam. Acartiidae. 



Gen. Paracartia, Scott, 1894. 



Generic Characters. General appearance somewhat resembling that of 

 Acartia; sexual differences, however, much more conspicuously marked. Last 

 trunkal segment in both sexes wholly coalesced with the preceding segment, 

 and in female expanded on each side to a broad wing-like lappet; in male 

 simple, not expanded. Urosome in female short, and composed of only 3 

 segments, the 1st of which (the genital segment) is much the largest and 

 lamellarly expanded laterally; caudal rami broad, with one of the apical setae 

 converted to a strong spine. Urosome of male slender and composed of 4 

 well-defined segments, the 1st of which is rather small; none of the caudal 



