326 



generally found in Copepoda). Cephalic segment of moderate size and projecting 

 in front to a very small rostral prominence. The 4 succeeding segments gradually 

 increase in size, and are without distinct epimeral plates. Urosome conside- 

 rably exceeding in length the anterior division, and composed of 5 well-defined 

 segments, the genital segment being distinctly subdivided in the middle; last seg- 

 ment about the size of the preceding one, and having the anal opercle only 

 slightly indicated. Caudal rami comparatively short and rather broad in their 

 proximal part, but abruptly contracted distally, the outer edge forming in the 

 middle a nearly rectangular bend, inner edge straight; middle apical seta very 

 long, attaining nearly half the length of the body, and extended straight backwards. 

 Eye inconspicuous. Anterior antennae rather small, scarcely more than half as 

 long as the cephalic segment, and clothed with comparatively short setae, the 4 

 joints of the proximal part rather thick and of nearly equal length, terminal part 

 narrowing abruptly, with the last joint longer than the other 2 combined. 

 Posterior antennae short and robust, with the distal joint scarcely as long as the 

 proximal one, and armed with 7 claw-like spines, 2 on the outer edge and 5 on 

 the blunted end ; outer ramus very small, and tipped with a single spiniform seta. 

 Mandibular palp likewise very, small, and provided with only 2 apical setae. 1st 

 pair of legs with the inner ramus somewhat shorter than the outer, distal joint 

 about the length of the proximal one, ! and armed at the tip with a strong claw- 

 like spine and 2 very unequal setae; terminal joint of outer ramus shorter than 

 either of the 2 preceding joints, and armed at the end with 2 spines and 2 curved 

 setae. The 3 succeeding pairs of essentially the same appearance, inner ramus about 

 the length of the first 2 joints of the outer combined, and provided at the end 

 with a spine and 2 exceedingly long setae, carrying moreover inside near ttie end 

 a short seta, and in the 3rd pair another similar seta inside the proximal joint; 

 terminal joint of outer ramus in 2nd pair with 1, in the 2 succeeding pairs with 

 2, comparatively small setae inside. Last pair of legs extremely small, with 3 

 unequal setae at the end, and another very slender seta attached to a knob-like 

 projection outside. 



Colour not yet ascertained. 



Length of adult female 1.50 mm. 



Remarks. This form, as stated above, was at first referred by Th. Scott, 

 though with some hesitation, to the genus Cylindropsyllus of Brady, to which it 

 certainly bears a general external resemblance. Having, however, subsequently 

 renewed his examination of both sexes, he became fully convinced of the generic 

 distinctness of this form. 





