M2 TAGE SKOC.SDERO 



Somowhat autoro-veiu rally of tlic siiiiH'-l)oariug list this row becomes denser and a1 the same 

 time its biistles become soiiu'wliai Idiij^er; it continues alonji llic ventral tliinl or lialldl' llic spine- 

 bearing list, running about iialf-wax between and parallel \'< the spine-beaiing list and ihe 

 margin of the shell. Apart from this there are no medial bristles at all on the ])art between the 

 spine-bearing list and the margin of the shell (= fig. 1 of A. Grimaldi var. vidua). Tlic spine- 

 bearing list has rather few hyaline spines — only 18 — 22 were observed — and a lliiii row of 

 short l>ristles, one or two bristles to each hyaline spine. Somewhat within and about parallel 

 to the posterior margin of tlH> shell there runs along the dorsal thin! or hall ot the sj)ine- 

 bearing list a sparse row of broad pores; five or six of these weic observed. Close to these broad 

 pores there are numerous fine pores, arranged in a close and very irregular row extending from 

 a point somewhat ventrally of the ventral broad pore up to the dorsal boundary of the spine- 

 bearing list. On the part between the spine-bearing list and the posterior margin of the shell 

 there is no ridge such as is described for A. norvegica. 



First a n t t' n n a (fig. 10): — This has six joints; the original third and fourth joints 

 are united, although the boundary between them can still be traced. These two joints form 

 together an almost quadratic joint, which is about as long as the two following joints together 

 and which has a distal boundary that is only slightly concave, almost straight. The anterior 

 bristle of the second joint is somewhat shorter than the anterior side of this joint. The original 

 third joint has six anterior bristles, of which nos. 5 and 6 are attached at the side of each other. 

 Bristles nos. 1, 2, 4 and 5 are armed with long, stiff secondary bristles, which are placed pretty 

 well on all sides on bristle no. 5 and on the ventral sides of the others. Bristles nos. 3 and 6 

 have at the middle somewhat shorter and finer secondary bristles than those on the four last- 

 mentioned bristles; they are often pressed close to the bristle, so that it seems to have no 

 long secondary bristles. The longer of the two postero-distal bristles on the original fourth 

 joint is about as long as or somewhat longer than the total length of the three distal joints. The 

 stem of the sensorial bristle of the fifth joint is relatively short, about as long as the total length 

 of the three distal joints; it has seven sensorial filaments. The a-claw is somewhat shorter than 

 the total length of the dorsal sides of the two joints next to the distal one; it is smooth. The 

 d-bristle is reduced. The f-bristle has four or five, usually five, sensorial filaments; the c- and 

 g-bristles sometimes have six filaments each, often (in five out of the eight individuals investig- 

 ated) five sensorial filaments were observed on the c-bristle and six on the g-bristle. Pilosity: 

 First joint: There is sparse pilosity dorso-distally and ventero-disto-mediaUy. The second joint 

 is sparsely furnished with hairs, especially postero-medially ; there are no hairs distally on this joint. 



Second antenna (fig. 5) : — The protopodite does not possess disto- 

 mediallv near the exopodite the bristle that characterizes this joint in other species of this 

 genus that are dealt with in this work. The end joint of the exopodite has four bristles. 

 The fourth to the ninth joints of this branch have basal spines. The endopodite is weakly 

 three-jointed; its end bristle is about as long as the stem. 



Mandible (fig. 6, 7 and 8) : — Protopodite: Coxale: The scythe-shaped process: 

 The part situated distally of the main spine grows rapidly narrower into a fine point; its ventral 

 edge is somewdiat concave and has a decided corner near the main spine. The distance from 



