studies on iiiarinc Osliucods 



2li7 



along the posterior edge of the rostrum. It has uniform, close and fine cross-striation and is 

 exceedingly finely serrated at the edge, almost smooth-edged. 



First antenna: — The situation and the relative lengths of all the bristles seem 

 to agree rather closely with ('. ( V.) norvegica, the posterior bristle of the fourth joint is, however, 

 shorter relatively and the c-bristle of the seventh joint is somewhat, though rather slightly, 

 longer than the g-bristle of the eighth joint. Presumably, however, the relative lengths of the 

 bristles vary somewhat in this species as well. These 

 two species also show very close agreement with regard 

 to the number and type of the filaments of the bristles. 

 On the proximal filaments of the sensory bristle of the 

 fifth joint we find proximally from none to seven small 

 secondary spines, some of them almost invisible. (Jf 

 the bristles on the seventh and eighth joints the b- 

 bristle has four filaments, the c-bristle ten, the f -bristle 

 also ten and the g-bristle eleven filaments; these fila- 

 ments are furnished with from none to five secondary 

 spines. The simple sensory bristles d and e are about 

 a third of the length of the c-bristle. Pilosity: The 

 second joint has a more abundant pilosity than in 

 C. (V.) norvegica. 



Second antenna: — This agrees in most 

 respects with that of C. (V.) norvegica. It is to be noted, 

 however, that the spines at the base of the bristle on 

 the second e x o p o d ivt e joint seem to be almost or 

 entirely lacking, and that the bristle on the second 

 e n d o p (J (1 i I e joint attains about the same lengtli 

 as or is somewhat shorter than the end joint of the 

 endopodite. — According to G. \\. MiJLLER's state- 

 ment (19U8, p. 85) ,,das basale Glied" (of the endo- 

 podite) is ,,kurz, mit einer Borstetigruppe am Vorder- 

 rand nahe der Basis, zu der noch eine weiter distal 

 stehendc kommen kann". Whether or not a variation 

 is present in the last-mentioned bristle I have, of 



course, been unable to decide; it seems to me probable, iiowever, that there is no variation, 

 but that the statement is based on some specimens that were defective in this character. This 

 assumption is supported by the state of affairs in C. (V.) norvegica, in which species this 

 bristle is always found; cf. also several other species, for instance those of Gigantocypris and 

 Doloria. The specimen investigated by me had this bristle developed as in C (V.) norvegica. 



Mandible: — This is extremely similar to that of C. (V.) norvegica. The anterior 

 side of the second endopodite joint has comparatively few (eight were observed) more 

 or less long bristles with short, fine hairs and has from seventeen to nineteen cleaning bristles. 



Ki-. XLllI 



Mil.LFH. }• 



— C. (l'(ir«iilit) antiinlica d. W. 

 — Aiileriur pari of llu? i'iH:lit valve, 

 ei'ii from insiilc; .52 X. 



