65 



truncated and carrying 3 spiniform setae, the innermost but one much longer 

 than the others, outer edge provided with a well defined seta about in the 

 middle, and the dorsal face with another smaller seta at a short distance from 

 the tip. Eye inconspicuous. Anterior antennas short and thick, somewhat 

 curved and terminating in a blunt point, each antenna composed of 6 joints 

 densely clothed with comparatively short but rather strong curved setae. Posterior 

 antennae rather broad at the base, but rapidly tapered distally, the first 2 joints 

 each armed near the end anteriorly with a slender spine, terminal joint narrow, 

 sublinear in form, and provided with a short spine in about the middle* of 

 the outer edge, tip armed with a comparatively small claw slightly curved at 

 the end and accompanied by 2 or 3 small bristles. Anterior lip broad, almost 

 trapezoid in form. Mandibles with the masticatory part divided at the end 

 into several sharply pointed teath, partly bi- or tri-partite; palp very small 

 and apparently undivided with 3 or 4 short setae at the tip and one consider- 

 ably larger seta outside, apparently replacing the outer ramus. Maxillae divided 

 into 2 nearly equal triangular lobes, the inner one representing the masticatory 

 lobe, the outer the palp, both edged with a number of partly spiniform setae. 

 Anterior maxillipeds only composed of 2 distinctly defined joints, the proximal 

 one rather large and provided inside with a short lobe tipped with 2 small 

 spines; distal joint produced at the end to a strong claw-like spine accompanied 

 outside by another much narrower spine, its outer edge provided with 4 small 

 bristles arranged in pairs. Posterior maxillipeds very small and closely approx- 

 imate, each forming a narrow somewhat curved lamella, with 3 small setae at 

 the tip and 2 other similar setae in about the middle of the outer edge. The 

 4 anterior pairs of legs of essentially same structure, with both rami biarticulate, 

 the outer one somewhat incurved and without any setae inside, but armed 

 outside and at the tip with strong spines; inner ramus carrying on the extremity 

 3 4 exceedingly long and quite smooth spiniform setae extending backwards 

 along the median line of the belly. Last pair of legs transformed to 2 very 

 large curved lamellae J ) encompassing the middle part of the body and completely 

 arching over the ovisacs. The latter closely juxtaposed and of oblong oval 

 form, reaching nearly to the end of the 1st caudal segment. Ovarial tubes 

 very conspicuous in the living animal, and extending far into the tail. 



Male of very small size, as compared with the female, and rather unlike 

 it in its outward appearance, the body being somewhat depressed in its anterior 



It is the merite of Canu to have given a right interpretation of these lamellae, the 

 significance of which was wholly miscomprehended by Thorell and most other authors. 



9 Crustacea. 



