studies on marinn Ostiacods 24-S 



preceding species. The e x o p o d i t e is four-jointed. First joint: The main tooth has seven 

 constituent teeth, all well defined proximally; the secondary teeth of the latter vary to some 

 extent, approaching the type reproduced for C. (Vargula) norvegica. The bristle close to the 

 main tooth on the posterior side of the joint is of about the same size as in C. (D.) levis and, 

 as in this species, has long, stiff secondary bristles proximally of the middle; at the middle 

 it has a few powerful secondary teeth, distally it is smooth. On the anterior side of the joint 

 there are four bristles of the same type and position as in the preceding species. The second 

 exopodite joint has exactly the same number and position of its bristles as in the preceding 

 species: four a-bristles, eight b-bristles, one c- and one d-bristle; these bristles also show a far- 

 reaching agreement with this species in type and size, but the equipment of the a- and b-bristles 

 is obviously more powerful in the form dealt with here. The outer and inner lobes of the third 

 joint (fig. 6) are comparatively small, considerably smaller than the end joint. The inner 

 lobe has three bristles, two rather long and powerful distal bristles, somewhat different from 

 each other in length, and a very short one, situated proximally on the posterior side; all three 

 of them have long secondary bristles at the middle and short, fine hairs distaUy. The outer 

 lobe has two bristles, situated distally. whose type and size are about the same as those of the 

 distal bristles on the inner lobe of this joint; they are sometimes subequal, sometimes the outer 

 one is somewhat shorter than the inner one. The end joint (fig. 6) is rather large, almost square 

 in shape and shows traces distally and outwards of a little verruciform fifth joint. On the 

 latter process there are two bristles, of about the same length and type as the two bristles on 

 the outer lobe of the preceding joint. Besides these bristles the end joint has distally near 

 the medial edge three or four, usually four, bristles of which the inner ones are somewhat shorter 

 than the outer ones, all somewhat shorter than the two outer bristles of this joint; the outer 

 ones of these four are usually of the same type as the two last-mentioned bristles, the inner 

 ones often have short hairs. Pilosity: The outer lobe of the third exopodite joint and the end 

 joint have close, fine hairs. 



Sixth limb (fig. 7): — Protopodite: The first endite has two rather long and 

 powerful distal bristles, fiimished with a few oblique wreaths of long, stiff secondary bristles, 

 and two to three short, plumous medial bristles. The second endite has two rather long and power- 

 ful, subequal distal bristles, with a wreath of long, stiff secondary bristles at the middle and short 

 hairs distally; in addition it has three rather short, plumous medial bristles. The third endite 

 has four distal bristles, of which one of the dorsal ones is rather short and powerful, with a wreath 

 of long, stiff secondary bristles at the middle, and bare distally; the other three are rather long 

 and powerful, subequal, all of them sometimes of the sanle type as the distal bristles of the 

 second endite, sometimes two of them have short hairs; this joint has, in addition, one medial 

 bristle of about the same type and length as the distal bristles on the preceding endite. The 

 e p i p o d i a 1 appendage of the protopodite is represented by 5 rather short bristles, 

 either with short hairs or bare, fixed on a small, lobe-like process. Exopodite: The endite 

 of the first joint has from six to eight distal bristles, one of which is of about the same t^-pe 

 and size as the short distal bristle on the previous endite, a couple of ventral one.s also rather 

 short, but weak with short hairs, the rest subequal, rather long and powerful, most of them 



