131 



56. Pseudoeyelops obtusatus, Brady. 



(PL LXXXVIII). 



Pseudocydo2>s obtusatus, Brady & Kobertson, in Ann. Nat. Hist. ser. IV, Vol. XII, p. 128. 



PI. VIII, figs. 47. 



Specific Characters. Female. Anterior division of body, seen dorsally, 

 oval in form, greatest width slightly exceeding half the length, and occurring in 

 the middle, anterior extremity evenly rounded, posterior somewhat contracted; 

 seen laterally, considerably vaulted above. Cephalosome occupying nearly half 

 the anterior division, dorsal margin forming an even curve as far as the tip of 

 the rostrum; the latter rather strong, slightly curved, and terminating in a sharp 

 point. Last segment of metasome very small, with the lateral lobes narrowly 

 rounded. Urosome comparatively short, scarcely exceeding Vs of the length of 

 the anterior division, anal segment almost obsolete. Caudal rami scarcely longer 

 than they are broad, innermost but one of the apical setse much longer than the 

 others. Eye rather large, subdorsal. Anterior antennae, when reflexed, scarcely 

 reaching beyond the cephalosome, and consisting of 18 articulations, bristles 

 partly ciliated. Posterior antennae with the distal joint of the inner ramus fully 

 as long as the proximal one. Last pair of legs with the inner ramus distinctly 

 3-articulate ; terminal joint of outer ramus with 4 natatory setse inside. 



Male somewhat smaller than female, and having the rostral projection 

 sharply defined at the base. Urosome much more slender than in female, with 

 some of the segments slightly produced dorsally. Right anterior antenna with 

 the middle section somewhat tumefied. Last pair of legs very massive, basal 

 part of both legs considerably tumefied, and on right side biarticulate, on left 

 uniarticulate ; outer ramus with a strong defiexed spine outside, and terminating 

 on the right leg in 2 slender juxtaposed claws, on left leg in a peculiarly con- 

 torted, incurved piece; inner ramus on both legs lamellar. 



Colour. Body pellucid, whitish, with a slight rosy tinge along the ven- 

 tral face. 



Length of adult female 0.80 mm., of male 0.70 mm. 



Remarks. This form was first recorded by Brady and Robertson in the 

 above-mentioned journal, and was subsequently re-described by the first-named author 

 in his well-known Monograph of the British Copepoda. The specific name obtu- 

 satus seems to refer to the obtusely rounded frontal part. The rostrum is also 

 said to be short and blunt, and is so represented in the figure of the male given ; 

 but this may be due to the fact of the rostral plate having accidentally been 

 detached in the specimen examined. 



