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163. Laophonte Stromi (Baird). 



(PI. CLXXI & CLXXII). 



Canthocamptus Stromii, Baird, Brit. Entomostraca, p. 208, PL XXVII, fig. 3 (not Lilljeborg, nor 



Dactylopus Stromi Claus). 



Syn: Laophonte curticauda, Brady (not Boeck). 



Specific Characters. Female. Body rather slender, gradually attenuated 

 behind, with the segments well marked off from each other. Cephalic segment of 

 moderate size, with the rostral projection very short and rounded at the tip. 

 Urosome with the anterior segments slightly expanded laterally, last segment about 

 the length of the preceding one. Caudal rami about twice as long as they are broad, 

 smooth, with the tip transversely truncated, apical seta3 slender and elongated. 

 Anterior antennae rather slender, almost as long as the cephalic segment, and 

 distinctly 7-articulate. Posterior antennae with the stem itself of normal structure, 

 outer ramus however very small, and having the setae imperfectly developed. 1st 

 pair of legs with the outer ramus 3-articulate, and exceeding half the length of the 

 proximal joint of the inner, the latter rather strong and ciliated on both edges. 

 Natatory legs well developed, with the normal number of spines and setae. Last 

 pair of legs of moderate size, distal joint rather broad and obliquely oval in form, 

 with 6 marginal setae, the innermost of which is quite short and arising from a 

 nodiform projection bordered inside by a strongly chitinized rim ; inner expansion 

 of proximal joint rather broad, but scarcely extending beyond the middle of the 

 distal joint, marginal setse 5 in number, the outermost one very small. Ovisac 

 large, oval in form. 



Male somewhat smaller than female, and having the 2 anterior free seg- 

 ments of metasome considerably larger than the 2 succeeding ones. Urosome 

 much narrower than in female, almost cylindrical in form, with the segments 

 scarcely at all expanded laterally. Anterior antennae very powerfully developed 

 and strongly hinged, with the last joint of the proximal part globularly dilated, 

 distal part biarticulate and terminating in a sharp point. 2nd and 3rd pairs of 

 legs conspicuously transformed and much larger than in female, with the outer 

 rami very powerful, their terminal joint more or less incurved and having the 

 spines largely developed and divergent, setae of inner edge much reduced in size. 

 Inner ramus of 2nd pair with the proximal seta of the distal joint transformed 

 to a spine-like appendage pointing straight inwards and terminating in a hamiform 

 point; that of 3rd pair biarticulate, with the distal joint much dilated and pro- 

 duced outside to a short and thick spiniform projection flanked at the base with 

 a' row of 4 strong denticles, marginal setae 4 in number, 2 of them issuing from the 



