plate narrowly spoon-shaped and nearly horizontal. Caudal rami of moderate 

 size, about equalling in length the last segment, and tapering somewhat distally, 

 apical seta? not very divergent. Anterior antennae more slender than in the 3 

 preceding species, and composed of 6 well-defined articulations. Anterior lip 

 obtusely rounded in front, without any trace of a recurved projection. Natatory 

 legs comparatively more slender than in the 3 preceding species. Last pair of 

 legs of moderate size, with the distal joint rather broad and somewhat oblique, 

 apical spines slender, setiform, and rather unequal, the innermost being much 

 shorter than the other 2, inner expansion of proximal joint with a transverse row 

 of delicate spinules at the base, outer seta much shorter than the outermost one 

 of the distal joint. 



Colour pale yellowish. 



Length of adult female 0.88 mm. 



Remarks. This is a very slender species, and in so far resembles a form 

 briefly recorded by Th. Scott from Finmark under the name of E. finmarchicum. 

 It is, however, of somewhat smaller size, and moreover, to judge from the figures 

 given, seems to exhibit some difference in the structure of the last pair of legs 

 and in the inter-relative length of their marginal spines. 



Occurrence. The only locality where I have hitherto met with this form, 

 is at Selven, near Agdenses, Trondhjem Fjord. It here occurred not unfrequently 

 in a depth of 3 6 fathoms, muddy sand. 



18. Ectinosoma Herdmani, Scott. 



(PI. XVIII, fig. 2). 



Ectinosoma Herdmani, Th. & A. Scott, Revision, &c. p. 432, PI. 36, figs. 16, 44; PI. 37, figs. 3, 



16, 29, 54; PL 38, figs. 7, 25, 33, 47. 



Specific Characters. Female. Body slender, sublinear in form, with the 

 cephalic segment, seen dorsally, considerably attenuated in front, rostral plate 

 narrowly exserted, spoon-shaped. Caudal rami very short, not nearly as long as 

 they are broad, apical seta? somewhat divergent. Anterior antennae slender, 6-ar- 

 ticulate. Anterior lip obtusely produced in front. Last pair of legs comparatively 

 small, with the marginal spines short and thick, all of about the same size. 



Colour whitish, semipellucid. 



Length of adult female scarcely exceeding 0.60 mm. 



Remarks. This form, first described by Th. & A. Scott, somewhat re- 

 sembles E. elongatum in the general form of the body, but is rather inferior in 



5 Crustacea. 



