250 TAGE SKOGSBERG 



and simple. Above these two bristles near the joining line there is a single, short, simple bristle. 

 Besides these three there are in some cases one or a few bristles inside the incisur. The list 

 behind the incisur is narrow, weakly undulating and has bifurcated bristles, situated very close 

 together, of about the same type as those on the rostrum. Farther back the list has fewer and 

 fewer bristles, half-way along the shell they are already very sparse and a little behind this 

 point they stop almost entirely, though one or a few may be found. Within the posterior 

 margin of the shell — where the list is somewhat broader than it is anteriorly — it has, however, 

 rather numerous small, simple bristles, very difficult to verify, and it is also characterized here 

 by pore-like formations similar to those reproduced for C. (Doloria) Levis (see p. 228, fig. 3). 

 On the part between the list and the margin of the shell — along both the posterior and ventral 

 margins — bristles generally seem to be quite absent; sometimes, however, a few may be observed. 

 The selvage is only broad along the posterior edge of the rostral incisur — the latter is quite filled 

 by it — the rest of it is narrow and does not extend outside the margin of the shell. It has 

 close, vmiform and fine cross-striation, often rather difficult to distinguish, and is exceedingly 

 finely serrated at the edge, almost smooth-edged. It is strongly calciferous, but thin and fragile. 



First antenna: — The two bristles of the third joint are rather long, of about 

 the same length as the following joint, the anterior one is fixed just proximally of the middle 

 of the joint. The anterior bristle of the fourth joint is, as a rule, somewhat shorter, the posterior 

 one somewhat longer than the fifth joint. The bristle of the sixth joint and the a-bristle of 

 the seventh joint are of about the same length as the fifth joint, the latter bristle being generally 

 somewhat longer than the former. The length of all these bristles varies somewhat, however. 

 They all have short hairs. The sensory bristle of the fifth joint is generally not quite as long 

 as the anterior side of the second to the fourth joints; sometimes it is only the same length as 

 the second and third joints. Of its thirteen sensory filaments the proximal ones are rather 

 long, attaining about a third to a half of the whole length of the bristle, and somewhat, though 

 only slightly, thicker than the distal ones; the latter are rather short, the transition in length 

 and thickness is, however, fairly gradual; all the sensory filaments are equally thick throughout 

 the whole length; the proximal ones are furnished proximally with up to four exceedingly 

 small, fine secondary spines, the distal ones are bare. Of the bristles on the seventh and eighth 

 joints (fig. 16) the b-bristle is quite short, rather slightly longer than the a-bristle (and rather 

 considerably shorter than the d- and e-bristles); along its proximal half it has four or five rather 

 short sensory filaments. The c-, f- and g-bristles are rather long; the last-mentioned one, which 

 is the longest, is about as long as the anterior side of the seven distal joints; of the two others 

 the f-bristle is the shorter. The c-bristle has ten or eleven sensory filaments, the f-bristle has 

 ten and the g-bristle has eleven. The sensory filaments on the b-, c-, f- and g-bristles are 

 furnished anteriorly with some (from zero to six) shoi-t and rather strong spines. The simple 

 sensory bristles d and e are about a third of the length of the c-, f- and g-bristles. Pilosity: 

 The second joint is only sparsely furnished with short hairs, arranged in a few transverse rows 

 on the anterior and posterior margins. 



S e (; o n d a n t c n n a: - 1' r o t o p o d i t c: About 1 mm. in specimens about 3,5 mm. 

 long. The medial-distal bristle is al)out as lono- as the second joint of th" endopodite. 



