39 



Remarks. This new species is chiefly characterised by the unusually short 

 rostral plate, a character which has given rise to the specific name here proposed. 

 In its general appearance it somewhat resembles E. gracile, Scott, the body being, 

 as in that form, considerably compressed. It differs, however, very markedly in 

 the structure of the anterior maxillipeds, which is quite normal, as also in that 

 of the last pair of legs. 



Occurrence. Only a single, but well-preserved ovigerous specimen of this 

 form was found last summer at Bejan, outer part of the Trondhjem Fjord, in a 

 depth of 2030 fathoms. 



25. Ectinosoma gracile, Scott. 



(PI. XXII, fig. 1). 



Ectinosoma gracile, Th. & A. Scott, Revision, p. 429, PI. 36, figs. 18, 37; PI. 37, figs. 13, 28, 45; 



PI. 38, figs. 3, 27, 30. 



Specific Characters. Female. Body exceedingly slender and much com- 

 pressed, seen dorsally, almost linear in form. Cephalic segment evenly contracted 

 in front, rostral plate somewhat deflexed and blunt at the tip. Caudal rami about 

 as long as they are broad, apical setse rather slender. Anterior antennaB com- 

 paratively slender and attenuated, though composed of only 6 articulations, the 

 penultimate one being very narrow and elongated. Anterior lip with the usual 

 recurved projection in front. Anterior maxillipeds unusually powerful, with the 

 2nd basal joint more than twice as long as the 1st, and considerably dilated at 

 the base, apical claws very slender and minutely denticulate. Last pair of legs 

 comparatively small, but with the marginal spines rather elongated, distal joint 

 regularly trilobate, with the innermost apical spine longer than the outermost; 

 appendicular bristle some distance from the margin; inner expansion of proximal 

 joint unusually short. 



Colour whitish gray. 



Length of adult female 0.55 mm. 



Remarks. This is a rather anomalous form, differing, among other things, 

 from the other known species of this genus very markedly in the structure of the 

 anterior maxillipeds. I have been enabled to prove the identity of this form 

 with that described by Mr. Scott, by comparing it with some specimens kindly 

 sent to me by that author. 



