128 



Remarks. This form was considered by Prof v Brady as only a variety 

 of D. thisboides. It is, however, certainly specifically distinct, as is clearly 

 proved, both by the distinctly 9-articulate anterior antennae and by the rather 

 different structure of the last pair of legs. Moreover, the inner transformed 

 ramus of the 2nd pair of legs in the male exhibits characteristic differences from 

 that in the male of D. thisboides. 



Occurrence. I have hitherto only observed this form in a single locality, 

 viz. in the (immediate vicinity of Trondhjem, where some few specimens were taken 

 from tidal pools. 



Distribution. British Isles (Brady). 



81. Dactylopusia Vlllgaris, G. 0. Sars (new name). 



(PI. LXXIX, fig. 1). 



Dactylopus Stromi, Glaus, Die freilebenden Copepoden, p. 126, PI. XVI, figs. 1 6 (not Can- 



thocamptus Stromi, Baird). 



Specific Characters. Female. Body considerably shorter and stouter than 

 in the 2 preceding species, and conspicuously depressed throughout. Cephalic 

 segment fully as long as the 4 succeeding ones combined; rostrum well developed 

 and somewhat curved. Urosome scarcely exceeding half the length of the anterior 

 division, all the segments fringed at the hind edge ventrally with delicate spinules, 

 genital segment scarcely broader in front than behind. Caudal rami about as in 

 D. neglecta. Anterior antennae of moderate length and distinctly 9-articulate, 

 distal part about the length of the 3 preceding joints combined. 1st pair of legs 

 resembling in structure those in D. neglecta, though having the apical claws of 

 both rami somewhat stronger and distinctly denticulated. Last pair of legs with 

 the distal joint broadly ovate or cordate in form, tip narrowly exserted and car- 

 rying 2 unequal bristles, outer edge with 3 subequal setse, inner one with a single 

 somewhat stronger seta; inner expansion of proximal joint rather large, though 

 less broad than in D. thisboides, and extending about as far as the distal joint, 

 both joints exhibiting inside the inner edge a row of short transverse chitinous 

 stripes. 



Male with the inner ramus of 2nd pair of legs resembling in shape that 

 in D. neglecta, apical spines, however, less strong, and spine of outer edge at- 

 tached to about the middle of the distal joint. Last pair of legs with the distal 

 joint much shorter than in female and provided with an additional seta inside, 

 inner expansion ~of proximal joint extending as far as the distal joint and car- 

 rying 3 marginal setae. 



