and records it next to Westwoodia, to which genus it certainly bears some 

 resemblance as regards the external appearance of the body. The structural details, 

 however, are very different, and forbid the union of these two genera into the 

 same family. In addition to the typical form, another closely related species has 

 been described by Th. Scott from the Gulf of Guinea. 



220. Metis ignea, Philippi. 



(PI. CCXXVIII). 



Metis ignea, Philippi, Fernere Beobuclituugen iiber die Copepoden dea Mittelmeeres ; Arcbiv fiir 

 Naturgeschichte 1843, s. 61, PJ. IV, fig. 7. 



Syn: Ilyopsyllus coriaceus, Brady. 



Specific Characters. Female. Body sub-pyriform in shape, with the back 

 more or less curved and with no sharply marked demarcation between the anterior 

 and posterior divisions. Cephalic segment exceedingly large and vaulted, occupy- 

 ing almost half the length of the body; rostral projection not distinctly defined 

 behind, linguiform, deflexed. The 4 succeeding segments densely crowded, with 

 the epimeral plates small, but acutangular behind. Urosome scarcely exceeding 

 Vs of the length of the anterior division and rapidly tapered behind. Caudal 

 rami quadrangular, being about as long as they are broad, inner apical seta 

 nearly as long as the whole body, outer one much shorter. Eye large and 

 conspicuous in the living animal. Anterior antennae comparatively short and 

 stout, hood-like projection of 2nd joint finely crenulated along the anterior edge ; 

 3rd joint abruptly much narrower than the 2 preceding joints, and carrying at 

 the end the usual sensory filament, joints of terminal part subequal in size. 

 Posterior antennae with the proximal part very strong, distal joint comparatively 

 short, and armed with 6 unequal claw-like spines. 1st pair of legs with the 

 basal part very thick and massive, carrying at the end on each side a strong 

 spine, outer ramus somewhat incurved at the base, and without any setae inside, 

 last joint shorter than the preceding one, and armed at the tip with 2 strong 

 unequal spines, and inside them with 2 slender setae; inner ramus scarcely 

 more than half as long as the outer, proximal joint short, unarmed, distal 

 joint carrying on the tip 2 strong spines of unequal length. The 3 succeeding 

 pairs of legs with the outer ramus a little longer than the inner, and having the 

 spines of the outer edge rather slender; apical setae of both rami much elongated. 

 Last pair of legs represented by 2 extremely small juxtaposed lamellae of trian- 

 gular form and with only slight traces of marginal setae. 



Male somewhat smaller than female, but otherwise of a rather similar 

 appearance. Anterior antennae, however, distinctly prehensile and composed of 8 



46 Crustacea. 



