330 



tog-ether in copula, the female being firmly grasped in the middle by the power- 

 ful anterior antennae of the male. 



Distribution. Baltic (Lilljeborg), British Isles (Brady), coast of France 

 (Canu). 



Gen. 75. PseudOtaehidiUS, Scott, 1898. 



Generic Characters. Body robust, with the anterior division considerably 

 expanded and rather sharply marked off from the posterior. Rostral projection 

 conically produced, genital segment in female distinctly subdivided. Caudal rami 

 very short. Anterior antennae short and stout, 6-articulate, and clothed with 

 strong ciliated setae; those in male less strongly hinged than in Tachidiu*. Posterior 

 antennae with the proximal joint not subdivided, outer ramus rather large 3-arti- 

 culate. Oral parts on the whole more fully developed than in Tachidius. Natatory 

 legs densely spinulose; 1st pair with the inner ramus distinctly 3-articulate and 

 much larger than the outer, being rather dilated at the base and angularly bent 

 in the middle; inner ramus of 2nd and 3rd pair in male slightly transformed. 

 Last pair of legs very small, but with the distal joint well defined. 



Remarks. This genus, established by Th. Scott, differs conspicuously in some 

 respects from Tachidius, though exhibiting a general resemblance to that genus 

 as regards outward appearance and the structure of the natatory legs. Only a 

 single species is as yet known. 



212. Pseudotachidius eoronatus, Scott. 



(PI. CCXX). 



Pseudotachidius eoronatus, Th. Scott, Additions to the Fauna of Loch Fyne; Sixteenth Annual 

 Keport of the Fishery Board for Scotland, Part III, p. 2(57, PL XIII, figs. 2226, PI. XV. 



figs. 14. 



Specific Characters. Female. Body short and stout, with the anterior 

 division oblong quadrangular in outline and much broader than the posterior. 

 Cephalic segment large, almost equalling in length the 4 succeeding segments 

 combined; rostral projection rather prominent and obtusely acuminate at the 

 tip, which carries 2 delicate hair-like bristles. Last pedigerous segment much 

 narrower than the preceding ones, and slightly produced on either side. Uro- 

 some about half the length of the anterior division, and of almost uniform 

 width throughout, posterior edge of the segments minutely spinulose; last segment 



