21 



approach to the one here under consideration, I find that, without any serious 

 scruple, it may be included in the family Cydopinidce, as here defined. 



In addition to the typical species described below, 2 closely-allied species, 

 P. egregius and P. illustris, have been recorded by Dr. Giesbrecht from the 

 gulf of Naples. 



9. Pterinopsyllus insignis, Brady. 



(PI. X & XI). 



Lophophorus insignis, Brady, Monograph of British Copepoda, Vol. I, p. 1-22, PI. XIII, figs. 1 10, 



PI. XV, fig. 10. 



Specific Characters. Female. Body rather stout, with the anterior division 

 ovate in outline, greatest width exceeding half the length and occurring about in 

 the middle. Cephalic segment large and narrowly produced in front. Last 

 trunk-segment sharply defined from the preceding one, and projecting laterally 

 in a small dentiform process. Tail about half the length of the anterior division, 

 and nearly of uniform width throughout; genital segment about as long as the 3 

 succeeding ones combined, and scarcely at all dilated in front; anal segment 

 shorter than the preceding one. Caudal rami quadrangular in shape, being scarcely 

 longer than they are broad, seta of outer edge obsolete, the 2 middle apical setae 

 very strong and divergent, with coarser and more scattered hairs on their proximal 

 parts, seta of outer corner much smaller than that of the inner, both very thin 

 and naked. Anterior antennae scarcely more than half as long as the cephalic 

 segment and rather broad at the base, being composed of 8 joints, the 2nd of 

 which is the largest, 5th joint very small. Posterior antennae clothed along the 

 outer edge and at the tip with coarsely hairy setae, inner edge without any setae. 

 4th pair of natatory legs with the inner ramus much shorter than the outer, 

 middle joint imperfectly defined from the terminal one and without any setae 

 inside, the latter joint having inside 2 short blunt spines replacing the usual 

 setae. Last pair of legs with the 1st joint imperfectly defined at the base, but 

 carrying inside a well-developed ciliated seta, 2nd joint conically produced out- 

 side and carrying the usual thin bristle, last joint much larger than the other 2 

 combined, and forming a rounded oval lamella coarsely ciliated inside and provided 

 with 4 slender setae, 3 of which are ciliated, the 4th, issuing from the tip, very 

 thin and smooth. Ovisacs. according to Brady, short pyriform, with a limited 

 number of ova. 



Male of smaller size than female, and easily recognisable by the very 

 coarse structure of the anterior antennae, which are powerful prehensile organs 

 divided into 12 joints. Inner ramus of 1st pair of legs with the apical spine 



