26 G. O. SARS. [SEC. ARC. EXP. FRAM 



distal joint considerably narrowed in its outer part, spine of outer edge 

 unusually short and attached beyond the middle, tip provided with a 

 small spine and a long flexuous seta. Last pair of legs with the distal 

 joint rather small, inner expansion of proximal joint well developed, 

 but provided with only 3 short setae. 



Length of adult female about 1 mm. 



Remarks. - This form is nearly allied to D. vulgaris, but is of 

 considerably larger size, in which respect it about equals D. thisboides 

 GLAUS. From both these species it is distinguished by the very broad 

 rounded form of the distal joint of the last pair of legs in the female, 

 as also by the more strongly built 1st pair of legs. From D. thisboides 

 it moreover differs by the distinctly 9-articulate anterior antennae. The 

 structure of the inner ramus of the 2nd pair of legs in the male differs 

 also conspicuously from that in the 2 species mentioned. 



Occurrence. This form was found rather abundantly in a 

 bottle of specimens taken on July 30, 1900 (the exact locality not indi- 

 cated). It also occurred occasionally in some of the other bottles. 



100. Dactylopusia, brevicornis, GLS. 



Some specimens of this distinct species occurred in a bottle of 

 specimens taken on July 12, 1900, in the bay at Land's End. 



101. Idomene coronata (SCOTT). 



(Pi. VI). 



Dactylopus coronatus, TH. SCOTT, Additions to the Fauna of the Firth of 

 Forth. 12th. Ann. Rep. of Fish. Board for Scotland, Part III, p. 255, 

 PI. IX, figs. 12-20. 



Specific Characters. - - Female. Body short and stout, pro- 

 nouncedly depressed, with the anterior division broad and expanded, 

 oval in outline. Cephalic segment large and evenly rounded in front, 

 rostral projection somewhat deflexed, lamellar, obtusely rounded at the 

 tip. Epimeral plates of the 3 succeeding segments sub-imbricate and 

 acutely produced at the hind corner. Last pedigerous segment much 

 narrower than the preceding ones, and without distinct epimeral plates. 

 Urosome short, scarcely more than */3 as l n g as the anterior division, 

 and much narrower, genital segment, as usual, the largest and, like 

 the 2 succeeding segments, finely spinulose at the hind edge laterally. 

 Caudal rami scarcely longer than they are broad, and spinulose at 

 the inner corner, innermost apical seta not spiniform and shorter than 

 the outermost, the 2 middle setae slender and elongated. Anterior 

 antennae short and stout, 7-articulate, and densely clothed with setae, 



