500 TAGE SKOGRBERG 



Mandible: — This is very like the corresponding limb in A. Miilleri. We must note: 

 Protopodite: Coxale: The scythe-shaped process (fig. 11): The dorsal bristle is often 

 fixed with almost its whole length distally of the main spine and extends beyond the distal point 

 of the process to an extent of about half its length. The dorsal serrate teeth are rather weak. 

 The main spine is sometimes rather weak, often moderately strong. There are four ventral 

 spines, the two proximal of which are rather strong, the two others have from two to four points 

 and are rather weak. Between the latter and the main spine two other very weak ventral 

 spines can sometimes be observed. Basale: The backward pointing process has four distal 

 bristles, three or four triaena bristles and two dwarf bristles. The triaena bristles are armed 

 with from two to five pairs of spines under the distal pair. The dorsal side of this joint has 

 only a few groups of short, fine, stiff hairs. The e x o p o d i t e (fig. 10) is, if its two distal 

 bristles are included, about as long as the anterior side of the first endopodite joint or else it is 

 only slightly shorter. Endopodite (fig. 10): Second joint: The proximal bristle is about 

 half as long as the main bristle a. The medial cleaning bristles are comparatively few, four 

 to six, in a distinct lower row (the number varies from one individual to another and on the 

 right and left mandible of the same individual) and one bristle between the main bristles b and c. 



Maxilla (fig. 12): — This is like this limb in A. Mullen. The dorso-proximal bristle 

 of the protopodite is moderately long, about as long as the dorso-distal bristle. The 

 bristle of the first endopodite joint is rather slightly shorter than the bristle of the end joint. 



Sixth limb: — The postero-ventral corner is rather broadly rounded. There are 

 16 — 20 postero- and three antero-ventral bristles. On the anterior edge of the limb there are 

 three bristles, two of which are situated close to each other somewhat below the third. 



Seventh limb (fig. 13): — This is armed with 16 — 18, usually 18, cleaning bristles, 

 six of which are, as in A. Miilleri, concentrated at the point of the limb, three on each side. 

 These bristles have from two to four bells. Each end comb has from five to nine teeth; all the 

 teeth are finely and similarly pectinated; their points are somewhat strengthened, lancet-like, 

 about the same type as shown in fig. 13 of A. quinquesetae. 



The f u r c a, lateral eyes and median eye are similar to those of A. Miilleri. 



Male: — 



Shell: — Length, 1,60 — 1,61 mm. Length : height about 1,42:1. Seen from 

 the side (fig. 3) it has its greatest height about the middle and the anterior and posterior 

 parts are of about the same height. The dorsal margin forms a well rounded hump at the 

 middle and slopes from the middle evenly and rather decidedly forwards and backwards, about 

 equally strongly in each direction. The ventral margin is uniformly and slightly curved. The 

 shell is cut off rather abruptly posteriorly. The posterior margin is uniformly and moderately 

 strongly curved with a broadly roimdedline passing evenly into the ventral margin; it is boimded 

 from the dorsal margin by a broadly round and rather weakly developed corner. The anterior 

 margin is boldly rounded. The rostrum dominates to some extent over the part beneath the 

 incisur. Seen from beneath (fig. 4) it has its greatest breadth just in front of the middle 

 and the anterior part of the shell somewhat larger than the posterior part. The wreath of hair 

 round the posterior part of the shell is rather sparse. Seen from i n s i d e, the rostrum is 



