506 TAGE SKOGSBERG 



the margin of the shell there is a sparse row of broad pores (six such pores were observed). Outside 

 this row a not inconsiderable number of fine pores are scattered. On the other hand there is 

 no such ridge as is described for A. norvegica. 



First a n t e n n a (fig. 5) : — This has six joints; the third and fourth joints are united, 

 but yet the original boundary between these joints can, at least partly, be stiU traced. These 

 two joints are very much shortened; together they form a joint that is much shorter than its 

 height, only about as long as the original fifth joint. The distal boundary of the original fourth 

 joint is very decidedly concave. The anterior bristle of the second joint is somewhat longer 

 than the anterior side of this joint. The original third joint has six anterior bristles: Of these 

 bristles nos. 3 and 4, like nos. 5 and 6, are situated at the side of each other; bristles nos. 1, 2, 3, 

 4 and 6 have long, stiff secondary bristles ventrally, no. 5 has short hairs. The longer of the 

 two posterior distal bristles on the fourth joint is not quite so long as the total length of the 

 two following joints. The sensorial bristle of the fifth joint is comparatively short; its stem 

 is not quite so long as the two peniiltimate joints; it has six sensorial filaments. The end joint 

 has six bristles, the d-bristle is reduced. The a-claw is unusually long, being almost as long as 

 the total length of the third to the fifth (definite) joints; dorsally it is weakly pectinated at 

 the middle. The c-bristle has six, the f-bristle four or five and the g-bristle five sensorial fila- 

 ments. Pilosity: The first and second joints have only very slight pilosity developed; the first 

 joint is furnished with hairs ventero-medially ; the second joint has hairs proximo-anteriorly 

 and disto-posteriorly. especially on the inside of the antenna; the latter joint has no hairs on 

 the distal boundary. 



Second ante n n a: — The protopodite has a short bristle disto-medially 

 near the exopodite. The end joint of the exopodite has only three bristles, two long ones 

 and a rather short one. This joint has a reduced basal spine, which is sharply cut off at the point 

 and split into short hairs; apart from this the exopodite is quite without basal spines. The 

 bristle of the second joint of this branch has unusually long, fine secondary bristles, which 

 are almost as long as the natatory hairs on the following bristles. The endopodite 

 (fig. 6) is only weakly three-jointed; its end bristle is about one and a half times the length of 

 the stem. 



Mandible: — This is very like this limb of A. Miilleri. We may note: P r i, t o- 

 p d i t e: Coxale: The scythe-shaped process (fig. 7): The distance from the point of the process 

 to the main spine is not inconsiderably shorter than the distance from the latter to the proximal 

 ventral spine. The dorsal bristle is placed considerably nearer the point of the process than its 

 distance from the main spine and is about as far distally from the latter as its own length. The 

 main spine is, like its ridge of bristles, very weakly developed. There are four ventral spines, 

 the two distal of which are rather weak, and distally of these two or three very weak ones. 

 Basale: The backward pointing process has three or foiu" distal bristles, only one or two 

 triaena bristles and two dwarf bristles. The triaena bristles have from five to eleven pairs of 

 secondary spines proximaUy of the jiair of strong distal spines. The glands of this process 

 emerge on an almost entirely reduced verruca. At about the middle of the dorsal side of this 

 joint there is a single bristle which is about as long as the dorsal side of the joint (fig. 8) (on 



