JlU TAOK SKOC.SI!i;iiC. 



algae: 7 inaturo females. 1 mature male aiul S juMncs; l\. .M. S. 17-. S. A. 1"!., no number 

 of the station, tirytvikeu; '2'2. \'. l!t(i'2; on an old root ol Mdcioci/dis: :$ mature I'cmale.s; K. M. S. 

 173. S. A. E., Station '2S, mouth of Urytviken, lat. 54" 'Ji>' S.. long. 3(5" 28' W.; 24. V. 1902; 

 depth. 12 — \ri m.: sand and algae: t> n\ature females, 1 iiialure male and 3 larvae in the last 

 larval stage; K. .M. S. 174 and 175. 8. A. Iv. Station 33, Grytvik.'ii, lat. 54" 22' 8., long. 36" 28' W.; 

 'So. \. \W-2: depth 22 n\.: elay with algae: one mature female; R. M. fc>. 176. 

 Type-speeinuii on slides in the collections of the J{. M. 8. 



Asterope aberrata n. sp. 



Description: — F e m ale: — 



Shell: — Length, 1,65 — 1,71 nun.; leiigtli : height about 1,94 : 1; length : breadth 

 about 2,43 : 1. S e e n f r o m the s i d e (lig. 1) it is of a somewhat irregular elliptical shape; 

 the greatest height is at about tlu' middh'; the anterior and posterior ends are both comparatively 

 low, the latter being somewhat, though only rather slightly, higher than the former. The dorsal 

 and ventral margins are rather evenly and moderately curved, with almost the same shape, 

 though the former is somewhat, though only rather slightly, more strongly curved than the latter; 

 both are somewhat flattened anteriorly; they pass evenly into the anterior and posterior margins, 

 without any corners. The anterior end is boldly and evenly rounded, the posterior end is some- 

 what prolonged and forms a broadly rounded corner at about half way up the shell. Seen 

 from beneath (fig. 2) the shell is narrowly oviform with its greatest breadth just behind 

 the middle; its posterior end is somewhat more broadly rounded than the anterior one and it 

 has evenly curved side-contours. Seen from inside: Medial bristles: On the rostrum 

 (fig. 3) there are a moderate number of moderately long or rather short bristles. A number 

 of these are arranged in a more or less distinct and rather close row running about parallel to 

 and somewhat inside the anterior margin of the shell; the others are scattered. In the incisur 

 there are on the posterior edge of the rostrum a moderate number of moderately long, scattered 

 bristles. In addition there is in the incisur a few scattered bristles and a close row of moderately 

 long bristles, running somewhat inside and about parallel to the ventral margin of the rostrum. 

 On the part just behind the incisur there are a moderate number of scattered bristles, most 

 of which are moderately long, some, especially those situated farthest in, more or less short. 

 Along the middle part of the ventral margin of the shell there are a moderate number of rather 

 short bristles, arranged in a distinct row running about parallel to and somewhat inside the margin 

 of the shell. This row of bristles becomes somewhat more dense posteriorly and at the same 

 time the bristles become somewhat longer; it continues along almost the whole of the spine- 

 bearing list, ninning about parallel to and somewhat inside the margin of the shell (fig. 4); 

 in its dorsal part it becomes more sparse than it is ventraUy. The spine-bearing list has about 

 26 — 28 hyaline spines varying somewhat in size and a very sparse row of short bristles, usually 

 one bristle between each hyaline spine; between a number of the hyaline spines, however, there 

 are sometimes no bristles. About parallel to and half way between the bristle-bearing list and 



