studies oil marine Ostracods 545 



Along the distal half of the anterior edge of the second joint there is a series of seven moderately 

 long bristles of somewhat different lengths, the proximal one rather short, all furnished ventrally 

 with rather long, stiff secondary bristles arranged in two rows and with short hairs distaUy. 

 Laterally this joint has three rather short, short-haired bristles near the distal boundary. Third 

 joint: Along the anterior edge there are twelve bristles, five of which are attached along the 

 boundary of the fourth joint. Of the five distal of these bristles the one situated most medially 

 is relatively short, only about as long as the anterior edge of the fourth joint; the one situated 

 most laterally is very long, about as long as or somewhat longer than the total length of the four 

 (definitive) distal joints; the other three are rather considerably shorter than the last-mentioned 

 one and decrease somewhat in length the more medially they are situated. The bristles situated 

 proximally of these five are of moderate and somewhat different lengths. The two medial of the 

 five distal of these bristles are furnished with comparatively short hairs, all the others are provided 

 with a larger or smaller number of.more or less powerful secondary bristles, in most cases arranged 

 in two rows on the ventral side of the bristles; these bristles have most frequently fine, short 

 hairs distally. Posteriorly this joint has a single moderately long bristle with short, fine hairs. 

 Fourth joint: This has a single bristle antero-distaUy which is somewhat shorter than the total 

 length of the two (definitive) distal joints and is provided with long, soft secondary bristles arranged 

 on all sides, and is furnished with short hairs distally. Posteriorly this joint has five bristles 

 distally, which increase somewhat in length the more laterally they are placed; the medial 

 one is relatively short, not quite so long as the back edge of this joint, the lateral one is somewhat 

 longer than the total length of the four (definitive) distal joints. The medial one of these bristles 

 has short hairs, the others are rather abundantly supplied with soft, rather long secondary 

 bristles along the greater part of their length. Sensory bristle of the fifth joint: This has a very 

 powerfully developed stem, which is about as long as the posterior edge of the third to the sixth 

 (definitive) joints. Distally it is rounded and has there about fifteen (the number was not quite 

 certain, as the specimen was defective) sensorial filaments of about the same type; these are about 

 half the length of the stem and are rounded distally and there provided with a short, fine sen- 

 sorial hair. The accessory sensorial filaments are exceedingly numerous, somewhat narrower 

 than the distal ones but of about the same length as these, and are arranged in about 

 sixty more or less distinct transverse rows. The bristle of the original sixth joint is about 

 as long as the posterior edge of the sixth definitive joint, with long, soft secondary bristles; 

 it has short hairs distally. Original seventh and eighth joints: The a-claw is about as long 

 as or somewhat shorter than the anterior side of the fifth and sixth (definitive) joints, is relatively 

 narrow, and of almost uniform thickness along the greater part of its length, straight, directed 

 ventrally and pointed distally; it is bare and only slightly annulated. The b-bristle is rather 

 long, but considerably shorter than the c- and f-bristles (broken on both antennae) ; it has very 

 numerous sensorial filaments. The c- and f-filaments are subequal, somewhat longer than the 

 length of the shell, the lengths measured being 6,8 — 7 mm.; they have numerous sensorial 

 filaments, 48 — 49 being observed on the c-bristle, 55—56 on the f-bristle. The d- and e-bristles 

 issue, as in the males of Asterope, on a verruciform protuberance (cf. fig. 8 of A. norvegica), 

 penetrate between the c- and g-bristles and are held medially; they are not quite as long as 



Zoolog. bidroB, Upi»ala. Suppl.-Bd. 1. ' ■' 



