29 



Remarks. This form, first described by Scott in the above-quoted 

 treatise, is far inferior in size to those recorded in the preceding pages, and 

 may moreover easily be recognised by its shorter and stouter body as also by 

 the extraordinary length of some of the spines and setae attached to the nata- 

 tory legs. The last pair of legs are built on the same type as in the preceding 

 species and in E. melaniceps, though exhibiting some well-marked differences 

 from both of them. 



Occurrence. I have met with this small species in 2 different localities 

 of the south coast of Norway, viz., at Ris0r and Korshavn. It occurred occasio- 

 nally in depths ranging from 20 to 100 fathoms. 



Distribution. Scottish coast (Scott). 



20. Ectinosoma distinctum, G. O. Sars, n. sp. 



(PI. XVIII, fig. 1). 



Specific Characters. Female. General form of body somewhat re- 

 sembling that in E. tenerum, thoug comparatively less slender, the anterior 

 division being slightly dilated in the middle. Cephalic segment exceeding 

 somewhat in length the exposed part of the trunk, and rapidly contracted in 

 front; rostral plate rather prominent and, seen from above, obtusely pointed 

 at the end. Urosome exceeding in length 2 /a of the anterior division, and 

 only slightly tapered behind; genital segment about the length of the 2 suc- 

 ceeding segments combined; anal segment, as usual, the smallest and only 

 slightly incised behind in the middle. Caudal rami comparatively short, being 

 scarcely longer than they are broad at the base; apical setae rather slender. 

 Anterior antennae comparatively short and stout, though composed of 6 well- 

 defined joints. Posterior antennae with the outer ramus well developed, extending 

 as far as the inner. Anterior maxillipeds with the 2 basal joints of about 

 equal size. Natatory legs built on the usual type, the outer ramus being in 

 1st pair much smaller than the inner and scarcely extending beyond its middle 

 joint. Last pair of legs, however, exhibiting a rather characteristic structure; 

 distal joint narrow quadrangular in form, with the 2 outermost marginal setae 

 exceedingly strong and greatly thickened at the base, whereas the innermost 

 seta is quite rudimentary; appendicular bristle rather fully developed and attached 

 close to the base of the joint; inner expansion of proximal joint comparatively 

 short and stout, not nearly extending to the middle of the distal joint, and 

 coarsely ciliated inside, both apical setae strongly developed and of a similar 



