498 TAGE SKOGSBBRG 



Asterope curta n. sp. 



Description: — F e in ale: — 



Shell: — Length, 1,70 — 1,80 mm.; length : height about 1,32 : 1; length : breadth 

 aboiit 1,8 : 1. Both when looked at from the side and also from beneath 

 the shell is of about the same type as that of A. Mulleri, but is somewhat higher and wider in 

 comparison; cf. the figures 1 and 2. Sometimes, however, when seen from the side, it is somewhat 

 more sharply cut off at the back. Seen from inside: Medial bristles: On the rostrum, in the 

 incisur and at the part just behind the latter there is a moderate number of stiff bristles; most of 

 these are subequal and moderately long, but a few more or less short bristles may be found, 

 especially among those situated farthest in. All these bristles are scattered; sometimes, however, 

 the bristles that are situated on the rostrum just within the anterior margin of the shell may 

 be said to be arranged in a sparse and not quite distinct row running about parallel to the anterior 

 margin of the shell. Along the ventral margin of the shell there are a moderate number of rather 

 short bristles, in most cases arranged in a simple row running about parallel to and somewhat 

 inside the margin of the shell. Along almost the whole of the spine-bearing list and about 

 parallel to and half way between it and the posterior margin of the shell there runs a very close 

 and distinct row of stiff, moderately long, bristles (fig. 5). The spine-bearing list has about 

 24 — 25 hyaline spines and a thin row of short, subequal bristles, usually one or two, sometimes 

 three between each hyaline spine. There are no wide pores on the part between the spine- 

 bearing list and the posterior margin of the shell. An edge similar to that on the right shell of 

 A. sfinifera is developed in this species as well, but is somewhat weaker. 



First antenna (fig. 6): — This is very like that of A. Mulleri. A few differences 

 may, however, be noted. The third and fourth joints together form an almost quadratic joint 

 and are together about as long as the total length of the fifth and sixth joints. The distal 

 boundary of the fourth joint is rather weakly or moderately strongly concave. The third joint 

 has only five bristles anteriorly; judging from the equipment and situation of the bristles it is 

 bristle no. 2 of those species that have six bristles that is lacking. On bristle no. 1 there are 

 numerous long, stiff secondary bristles ventrally, on bristles nos. 2, 3 and 5 there are a few similar 

 secondary bristles, bristle no. 4 has short hairs. The longer of the two posterior distal bristles 

 on the fourth joint is, as a rule, somewhat shorter than the total length of the three distal joints; 

 in one case it was the same length as this. 



Second antenna: — Distally on the inside close to the exopodite the p r o t o- 

 p t) d i t e has a very short bristle. Exopodite: The end joint has only three bristles. 

 There is no basal spine except on the ninth joint, on which it is certainly large, but presumably 

 very weak, as it is divided into fine hairs distally. The e n d o p o d i t e is distinctly three- 

 jointed; its end bristle is slightly longer than the stem. In two cases out of five a short bristle 

 was observed on the second joint, both on the right and on the left antenna (abnormal?; a bristle 

 of this sort was oljserved by me as a rather infrequent abnormality n(jt oidj- in tliis genus but 

 in species of the family Cypridinidae); cf. the accompanying figure 8, 



