50 



Gen. 13. AmallOphOra, Scott, 1894. 



Syn: Scoledthrix, Giesbrecht (part). 

 ScapJiocalanus, G. O. Sars. 



Generic Characters. Body more or less slender, and of very different 

 appearance in the two sexes. Cephalosome in female attenuated anteriorly, and 

 sometimes exhibiting in front a distinct crest wholly wanting in male; rostral 

 prominence very small and undivided, tentacular appendages exceedingly delicate 

 and filiform. Last segment of metasome united with the preceding one. Urosome 

 less abbreviated than in most other forms, genital segment in female compara- 

 tively short and scarcely at all protuberant below, caudal setse rather unequal, 

 the innermost but one being much longer than the others. Anterior antennEe 

 in female consisting of 23 articulations, of which the first 2 are unusually large 

 and sharply marked off from the succeeding ones; those in male rather slender 

 and angularly curved in the middle, with some of the articulations coalesced. 

 Posterior antennse with both rami slender and elongated, especially the inner one. 

 Mandibles with the 3 outer denticles of the cutting edge of the same appearance, 

 bidentate, palp with the outer ramus exceedingly large, inner comparatively small. 

 Anterior maxillipeds with the 3 outer appendages of the terminal part vermiform, 

 the remaining 5 shorter and each terminating in a bud-like dilatation (amalla). 

 Oral parts in male considerably transformed. 1st pair of natatory legs com- 

 paratively small, the succeeding ones very powerfully developed, with the inner 

 ramus coarsely spinulous on the hind face; terminal spine of outer ramus strong, 

 serrate outside. Last pair of legs in female distinctly developed, biarticulate or 

 imperfectly triarticulate, last joint fusiform, with a slender denticulated spine 

 inside, a very short one outside, and a somewhat longer one at the tip; those 

 in male not very large, and rather asymmetrical, right leg with the 2nd basal joint 

 greatly tumefied in its proximal part, and carrying inside a styliform appendage 

 (inner ramus), its distal part attenuated and carrying at the tip a comparatively 

 short 3-articulate appendage (outer ramus) ; left leg with the 2nd basal joint 

 narrow cylindric, terminating in 2 subequal 3-articulate rami. 



Remarks. In the year 1894, the well-known Scotch naturalist, Th. Scott, 

 published a most interesting Report on the Entomostraca collected during the 

 expedition of the Telegraph Steamer "Buccaneer" in the gulf of Guinea. Among 

 the numerous forms of Calanoids procured, there were some species, which, 

 though on the whole exhibiting the characters of the genus Scoledthrix of Brady, 

 differed very conspicuously in the peculiar transformation of some of the terminal 



