Sliidics on marine Ostracods 



711 



are a few rather short, stiff spines, but otherwise this bristle is bare. The a- and 

 c-bristles are subequal, about as long as the second joint ot this limb; the a-bristle has an 

 accessory saccule (see the appended fig. 3) and is more or less irregularly 

 bent; the c-bristle has no accessory saccule and is more or less straight. 

 All the joints are quite bare. 



Second antenna: — P r o t o p o d i t e: In specimens with 

 shells about 2,2 mm. long this part measured about 1 — 1,1 mm. 

 Exopodite: The proportion between the length of this branch and 

 that of the protopodite is about 18 — 20 : 40. The proportion between 

 the length of its first joint and the total length of the eight distal joints 

 is about 10: 4 — 5. The proportion betw^een the length of the longest 

 natatory bristles and that of the exopodite is about 15 — 18 : 10. The 

 first joint has spines proximo-dorsally, but these form no distinct row 

 as in my fig. 13 of C. symmetrica^. Endopodite (see my fig. 8): 

 First joint: The processus mammillaris has a small distal verruca. The 

 a-bristle is bare; the b-bristle is bare or has only sparse short hairs. 

 Second joint: The c- and d-bristles are somewhat shorter than this joint 

 and are bare or almost bare. The e-bristle is short. The g-bristle is 

 about as long as or in most cases somewhat shorter than the protopodite; 

 it is rather broadly sword-shaped distally and has sparse short hairs along 

 one edge. The f-bristle is about a third shorter than the g-bristle and is 

 also somewhat sword-shaped distally and in most cases bare. Third joint: 

 The clasping organs are of the types described and reproduced by 

 V. VA\RA; see the appended figs. 8, 9 and 10. The right clasping organ is 

 in most cases furnished proximaUy with two verrucae of about the same 

 types as in the figure just mentioned and, in addition, with small, fine spines 

 along the concave side; distally it has transverse creases and an exceed- 

 ingly small hyaline papilla. The left clasping organ is also cross-grooved 

 distally and has an exceedingly small hyaline papilla; its proximal angle 

 varies somewhat in type. The h-, i- and j -bristles are about half as long 

 as the g-bristle. The h-bristle has a short but very sharply marked 

 shaft, the i- and j-bristles have a shaft that is somewhat longer but only 

 weakly developed. Just distally of the shaft these bristles are somewhat 

 thicker than the g-bristle. All these three bristles are bare. 



Mandible: — Protopodite: Coxale: The toothed edge 

 on the pars incisiva has from about eight to twelve teeth; this com- 

 paratively great variation was not due to the specimens investigated being 

 from different localities, as the extreme numbers could be observed in 

 specimens from the same locality. The posterior ones of these teeth are 

 often somewhat more strongly developed than in my fig. 16 of C. symmetrica. Distal tooth-list: 

 This is of about the same relative size and type as has been described above for (!. ohlonqa. 



fig. CXXXVI. 

 Conckocaa borealis G. 

 O.Sars.cJ. — 15. Distal 

 part of llie d-brisllc; 

 390 X. (From a spe- 

 cimen from Lofoten.) 



