320 TACK SKlMiSHKHC. 



hairs. Of tho distal bristles tiic l)-l)ristlo is about as loni; as tlio anti-rior sido of ilic second joint 

 or somewhat shorter; its proximal filament is furnished with a chitinized verruciform swelling 

 distally of the sucker (like ( \ ( Vargula) norvcgica; see fig. 1 5 of this species). Apart from this filament 

 there are on this bristle only two others, each furnished distally with five small, weak suctorial 

 organs and proximally of these a small verruciform process; the distal one of these iilaniciits 

 does not reach the point of the bristle. The c-bristle has ten filaments; the proximal one of 

 these is about the same as the jiroximal one on the b-bristle, no. 3, counting from the base, 

 is about as long as or only slightly longer and more jjowerful than the following ones and has 

 distally three very small and weak suctorial organs, proximally of which there is, as in the 

 b-bristle, a small wart; the other filaments on this bristle are furnished proximally with from no 

 to three very fine, secondary spines; the distal filament is very short and verruciform. 'I'he 

 f-bristle also has ten filaments, furnished with up to three short, fine secondary spines proximally; 

 the distal one of these filaments is verruciform. The c- and f-bristles are subequal and rather 

 considerably longer than the whole length of the shell (measuring from 2 to 2,1 mm. in specimens 

 with a length of shell of 1,72 mm.).* The g-bristle, which has eleven filaments, whose proportions 

 and equipment are about the same as the filaments on the f-bristle, is not quite so long as the 

 whole antenna. The simple sensory bristles d and e are somewhat different in length, the longer 

 one, the d-bristle, being about as long as the total length of the four distal joints (the original 

 fifth and sixth joints being reckoned as one joint). Pilosity: On the posterior side of the second 

 joint there are numerous transverse rows of short, stiff hairs (only faintly indicated in the 

 accompanying figure); this character seems, however, to vary to some extent; in one of the speci- 

 mens investigated these hairs were practically completely reduced. The other joints are smooth. 

 Second antenna: — Protopodite: Length, about 0,65 mm. The medial 

 distal bristle (fig. 6) has short hairs; it is moderately long, being about as long as the distal sensory 

 bristle of the endopodite. Exopodite (fig. 7) : This has about the following proportions 

 between its joints: 



I : II : 111 : IV : V : VI : VII : VIII : IX = 28 : 10 : 6 : 4 : 4 : 3 : 3 : 3 : 2. 



In other words the first joint is about as long as the total length of the five following joints, 

 the second is about that of the two following ones. The bristle of the second joint is onl}' as 

 long as the total length of the three following joints or somewhat shorter; it is furnished ventrally 

 with a few, about seven to ten, rather strong spines. The longest natatory bristles are somewhat 

 longer than the exopodite; the proportion between these two lengths is about 85 : 70. The 

 natatory^ bristles have broad natatory hairs. The end joint has only three bristles, of which 

 the two ventral ones are long, powerful natatory bristles, developed to the same extent as those 

 on the preceding joints, the dorsal one is only about as long as the total length of the four distal 

 joints and has short, fine hairs. The third to the ninth joints have narrow and relatively short 

 basal spines, which decrease in strength the more proximally they are situated, the one on the 

 third joint being almost completely reduced. The endopodite (fig. 6) is unjointed and 



• la this species I have observed, as G. W. Muller previously did for other species (cf. G. W. Mijller, 1906 b, 

 p. 16), that in a state of rest these bristles are bent posteriorly upwards along the dorsal side of the body inside the shell. 



