studies on iDarino Ostracods 



503 



bristles seem to be somewliat more numerous than in the female. Second joint: This joint has 

 two proximal bristles, one of which is about as long as, the other about half the length of, the 

 proximal bristle in the female. The medial cleaning bristles are somewhat more weakly equipped 

 than those of the female. On one specimen their number was the same as in the female, on the 

 other I found, besides the bristles observed in the female, a bristle situated somewhat inside 

 and distally of the cleaning bristle between the main bristles b and c. The end claw is not quite 

 so long as the anterior side of the second endopodite joint. 



F u r c a (fig. 14) : — This has eight claws, of which the five or six anterior ones may 

 be counted as main claws. The anterior main claw is somewhat more strongly bent than the 

 corresponding claw in the female and a somewhat more decided bend than in the female can 

 sometimes also be observed in the claw or claws nearest to this one. The two posterior claws 

 are annulated. 



The lateral eyes are somewhat larger than those of the female. 



Remarks: — It seems to me very probable that the male described above really belongs '^"^^ '''^ '""'* ''*• 

 to this species, partly because the two specimens that were caught were found together 



with females of this species at two separate stations, partly, and of course especially, because 

 of the very far-reaching agreement in its morphology that this male shows with the female 

 described above. The characters that do not seem to support this affinity are the following: 

 1) The length of the shell: this male is shorter than the female. In all other species of this genus 

 known so far the opposite condition has been found. 2) The bristle at the middle of the dorsal 

 side of the second protopodite joint of the male mandible. With regard to this character it 

 may, however, be pointed out that there is sexual dimorphism in A. Grimaldi in the bristles 

 on the dorsal side of this joint. 3) The second endopodite joint of the mandible has one 

 proximal bristle in the female, two in the male, but here too an increase in the number of 

 these bristles was observed in the males of A. Gritnaldi. 



At any rate this seems to be the only one of all the species so far known to which this 

 male can be assigned with any great probability. 



This species is certainly very closely related to the species A. ovalis, described by 

 G. W. MUller, 1908, p. 93, from the Antarctic, and later on named A. glacialis by the same 

 author (1912, p. 47). Only the male of this species is known as yet; the original description is 

 rather incomplete. It cannot be decided at present whether there is complete identity. The 

 following statements about A. glacialis are arguments against this identity: Shell : Length = 

 1,35 mm.; ,,Die Leiste ... ist im ganzen Umfang glattrandig" (presumably a mistake). First 

 antenna: The sensorial bristle of the fifth joint has only about four sensorial filaments (five are 

 drawn in the figure, one of these filaments is evidently considered as the distal part of the bristle). 

 The e-filament is shorter than the a-claw. The number of sensorial filaments on the b- and 

 g-bristles. The cleaning limb has only fourteen bristles. The furca has only seven claws. 



10 this species? 



Relation to 



A. glacialis 



<:. \y. Mullcr. 



Habitat: — South Ueorgia: S. A. K.. Station 2o, off Grytviken, lat. o4» 22' S., 

 long. 36" 27' W., (t y p o - I o c a 1 i t y); 21. \. 1902; depth, 24—52 m.; grey clay with scattered 



