4r)<> TAf.R sKii(;si!i:i!f; 



almost likt" a liiiiiclla ami is aliiuil liall llic Iciiiitli 41I tlic iiasali' (el. p. ■1(14 liclow); it t; rows ratlici' 

 ilocidt'dlv iiarrowfi" towards tlic point, is directed forwards and lias its ventral edj;e ]iresse(i 

 against tlie dorsal side of the protopodite. The eiidup^d ito has a constaiil iniinhrr of 

 bristles: The tirst joint has a short, often hare, bristle on the anterior side, situati'd in most eases 

 S(>niowhat dist^iUy of the nnddle of the joint. Tliis joint lias in addition postero-distally a lonji; 

 bristle with short, fine hairs. The end joint has only one l>ristle. Imiu and with short, fine hairs. 

 The inside of the protopodite and the epipodial a])penda<>e are abundantly furidshed with short, 

 tine hairs, arranged in groups or irregular rows. 



Fifth 1 i ni b: — In all the species of this genus investigated li\ me this limb has 

 practically the same stiiicture; it has not been used, as we shall see below, as a characteristic 

 for the species. — The comb is relatively narrow, with a uniforndy curved dorsal edge. The 

 eond> bristles are rather numerous; those situated nearest to the anterior point of the comb are 

 somewhat longer than the others; they are all pointed and finely annulated and are equipped 

 with abundant short, fine hairs. Most of the comb bristles are situated right on the ventral 

 margin of the comb, a few are displaced somewhat dorsally; thus from three to five of these 

 bristles were always observed displaced somewhat dorsally u]) on the lateral side of the comb 

 near the long bristle of the distal exopodite joints. The distal joints of the exopodite 

 are represented by a long, powerful bristle pointing forwards, extending in all the species 

 investigated by me a short distance beyond the anterior end of the comb and thickly furnished 

 with long, fine hairs arranged in the shape of a feather; cf. p. 465 below. Somewhat ventrally of 

 this bristle there are always two, short, subequal bristles, pointed similarly forward; only in one 

 of the species investigated by nie, A. norvegica, was only one of these bristles observed. 

 Dorsally of the distal comb bristles there is a series of rather long and coarse hairs; apart from 

 these the comb is to a great extent bare; at some places, however, short, fine hairs may be 

 observed. The epipodial appendage is somewhat ear-shaped and is characterized 

 by the fact that the bristles somewhat ventrally of the middle decrease very markedly in length 

 and then again increase strongly in length on the ventral lobe; a greater or smaller portion of 

 the distal part of these bristles is often bare or furnished with short hairs, but, as far as one 

 can see, is not modified as a sensory organ. See fig. 14 of A. aherrata. 



Sixth limb: — Seen from the side it is lamelliforni. The posterior margin is 

 straight or very slightly concave or convex and is marked off from the ventral margin by an 

 always well-rounded corner. The ventral margin is slightly and in most cases fairly uniformly 

 convex. The anterior margin is more or less decidedly concave, with a pointed corner marked 

 off from the ventral margin. Seen from beneath it is rather decidedly flattened anteriorly, 

 somewhat sole-shaped, with a well-rounded anterior edge; posteriorly it is narrow and lamelli- 

 form; cf. fig. 16 of A. Grimaldi. On the anterior edge there are usually two bristles with short 

 hairs or bare (^= remains of endites on the protopodite and the exopodite?); one of these is usually 

 attached at or .somewhat above, the other somewhat beneath a point half way up the limb; 

 sometimes there is only one, the uj:)per one, of these bristles, sometimes the ventral one is 

 duplicated; cf. also the description of this limb in A. ahyssicola. Along the anterior edge of the 

 sole-shaped flattened part of the ventral side there is a small number of rather short bristles. 



