319 



unarmed. Last segment a little shorter than the preceding one. and slightly con- 

 stricted in the middle. Caudal rami slender, exceeding in length the last 3 segments 

 combined, and somewhat attenuated distally, outer edge minutely spinulose and 

 carrying, somewhat in front of the middle, a small bristle, dorsal seta issuing much 

 nearer the end of the ramus, middle apical seta very long and slender, attaining half 

 the length of the body. Anterior antennae comparatively stout, much shorter than 

 the cephalic segment, and clothed with rather strong setae, the 3 joints of about 

 equal length, but diminishing successively in width. Posterior antennae with the 

 distal joint a little shorter than the proximal one. Posterior maxillipeds of moderate 

 size, hand oblong oval in form, dactylus exceedingly long and slender. 1st pair of 

 legs, with the inner ramus of about the same length as the outer, but somewhat 

 narrower, distal joint a little shorter than the proximal one, and tipped with 2 

 slender setae, distal joint of outer ramus armed with 3 spines and 2 geniculate setae. 

 Inner ramus of the 3 succeeding pairs about the length of the first 2 joints of the 

 outer ramus combined, its distal joint much the longest and carrying inside a com- 

 paratively short seta, at the tip 2 very long seta?, and outside them again, in the 

 3rd and 4th pairs, another smaller seta; terminal joint of outer ramus without any 

 setae inside. Last pair of legs with the distal joint long and narrow, though a little 

 dilated at the end, marginal setae 5 in number, 2 rather small on the outer edge 

 and 3 much coarser on the tip, the middle one rather elongated; proximal joint 

 with the digitiform process rather produced, inner expansion narrow and about half 

 the length of the distal joint, marginal setae of moderate length and 4 in number. 



Male with the anterior antennae rather strongly built and apparently com- 

 posed of 6 joints, the 4th rather dilated, terminal part claw-like. Inner ramus of 

 2nd pair of legs armed at the tip with a strong claw-like spine in addition to 

 the 2 apical setae. Last pair of legs much smaller than in female, distal joint 

 without any setae on the outer edge, inner expansion of proximal joint obsolete. 



Body of whitish colour, with dark bluish green intestine. 



Length of adult female 0.80 mm. 



Remarks. The present form is at once distinguished from any of the 

 other species included in this family, by the total absence of dorsal and sub- 

 dorsal processes ; whereas the lateral parts of the body are divided into a regular 

 series of acute lappets giving them a pronouncedly jagged appearance, hence the 

 specific name here proposed. In the structural details," as above stated, this form 

 exhibits a close relationship to the type of the present family, Anchorabolus mira- 

 1/iJis Norman. 



Occurrence. I have met with this form not unfrequently in one locality, 

 namely Bejan in the outer part of the Trondhjem Fjord, and occasionally also in 



