202 r\GE .SKOGSDEHG 



Gigantocypris Miilleri n. sp. 



? Gigantocypris pellucida, G. H. FoWLEr;, 1909, pp. 257, 296. 



Th. Scott, 1912 b, p. 5, pi. IL figs, i— 12. 



Description: — Female: — 



Shell: — Length 14 — 17 mm. The specimens from S/S ,,M i c h a e 1 S a r s" and 

 M/S ,,Armauer Hansen" attained a length of 14 — 16 mm.; the specimens from S/S 

 ,,A n t a r c t i c" 16,5 — 17 mm. It is almost globular, with about the following proportions: 

 — length : height : breadth — 16,5 : 15 : 14. Seen from the side (fig. 1) it is almost 

 perfectly circular, with the posterior part somewhat hirger than the anterior; the ventral side 

 is somewhat flattened. The rostrum small, somewhat convex anteriorly, sometimes a little 

 more than is shown in the adjoining figure, pointed ventrally. The posterior opening of the 

 shell, seen from the side, is sometimes not marked, sometimes more marked than in the adjoining 

 figure. Seen from beneath (fig. 2) it is also almost circular, with the posterior part 

 dominating somewhat over the anterior; sometimes a little more rounded at the back than 

 is shown in the adjoining figure. Seen from the front it is almost circular. The s u r- 

 f a c e of the shell is smooth, without any sculpture or hair. The pores of the surface 

 are very small and difficult to verify with certainty. Seen from within (fig. 19): 

 Medial bristles: On the rostrvmi there are very numerous, moderately long, simple, smooth, 

 rather powerful bristles; on the specimens from S/S ,,M i c h a e 1 S a r s" and M/S Armauer 

 Hansen" about 75 — 125 were observed, on the specimens from S/S ,,A n t a r c t i c" about 

 125 — 175 (on the adjoining figure, drawn from an ,,A n t a r c t i c" specimen, all the bristles 

 are, for practical reasons, not shown). Near the point of the rostrum these bristles are arranged 

 in irregular rows running within one another; sometimes they are, however, almost entfrely 

 without any arrangement; dorsally these bristles continue in a single row running near the 

 border of the shell almost to the junction between the two valves. Near the inner edge of the 

 incisur there is only one or a few short simple bristles, which vary in their position. Along the 

 ventral edge of the incisur there are only a few bristles or no bristles at all. Along the anterior 

 half of the ventral border of the shell on or near the list there is a somewhat varying number 

 of bristles, most of them of the same type as the rostral bristles, a few short and weak; posteriorly 

 these bristles become more and jnore sparse and at the same time shorter and weaker, but medial 

 bristles may be observed along the whole ventral edge of the shell ; the number of these bristles 

 is, as already stated, somewhat varying; on tlie average, however, there is the same number 

 along the whole ventral edge of the shell as on the rostrum. The joined part of the lamellae 

 along the edge of the shell is very narrow, which is probably connected with the balloon-like 

 swelling of tlie shell. The selvage is moderately broad, about the same width along the whole 

 edge of the shell, with fine cross-striation, and finely .serrated at the edge (fig. 5). 



First antenna: — This is rather elongated; the anterior side of the second to 

 the eighth joint measured, for instance, 4 mm. on a specimen with a length of shell of 14,5 mm.; 



