I50 DISCOVERY REPORTS 



Adambulacral armature: a curved furrow comb of 6 webbed slender spinelets, the 

 laterals much shorter than the 4 central. This number diminishes to 5, 4 and 3 as end of 

 ray is approached. The subambulacrals are on an oblique ridge of the surface at a higher 

 level than the marginals. They are a little shorter, more pointed, and very similar to 

 adjacent actinals. The webbed combs usually start with 5 spines and end with 3. 

 Furrow spines: longest 075 mm., shortest laterals, 0-22 mm. 



Mouth -plates with 8 marginal spinelets, the 16 of an angle basally webbed and 

 decreasing in length laterally from the central pair which are the largest spines on the 

 body. Three or four suborals border the outer half of suture ; and usually two somewhat 

 longer ones stand between these and margin. 



Type locality. St. 170. Off Cape Bowles, Clarence Island, 342 m., 7 specimens. 



Remarks. The specimens range in size from R 4-5 mm. to R 17 mm. (type). This is 

 probably a small species since the type does not appear to be immature. 



The species does not particularly suggest, by its general appearance, an Anseropoda. 

 The abactinal granules constitute an aberrant feature since Anseropoda typically has 

 delicate spinelets. Although the body is thin, its proportions have not reached the 

 bizarre stage of A. placenta and other typical species. The internal processes of the 

 abactinal and actinal plates are proportionately much shorter than in A. placenta and the 

 plates of the midradial region are not obviously stellate. In large species the long internal 

 processes are an essential anatomical contrivance in connection with numerous oblique 

 septa all along the ray. They make possible the survival of a creature which is very thin, 

 broad and delicate. If A. antarctica grows to a large size these processes undoubtedly 

 greatly lengthen. 



A curious feature of A. antarctica is the presence of hyaline spicules or thornlets on 

 the dorsal, coelomic, surface of the ambulacral plates. They are best developed on the 

 first 2 ambulacrals where they are prominent and occupy nearly the whole length of the 

 plate, especially on the narrow part between ampullae. Further on, they are confined to 

 the lower half of plate. I find a somewhat similar development in the relatively huge 

 six-rayed Atiseropoda rnsigms Fisher of the Hawaiian Islands. 



There appears to be no described species closely related to this dimmutive Anseropoda. 

 The abactinal granulation, alone, is distinctive. 



Genus Kampylaster Koehler 

 Kampylaster Koehler, 1920, p. 136. Type A', incurvatus Koehler. 



Kampylaster incurvatus Koehler 



(Fig. D, 3-3 J) 



Kampylaster ganulatus Koehler, 1920, p. 8 {nomen nudum). 



Kampylaster incurvatus Koehler, 1920, p. 138, pi. 36, figs. 4, 6, 7, 11; pi. 37, figs, i, 2, 3; pi. 66, 

 fig. 10. 



St. 190. Bismarck Strait, Palmer Archipelago, 93-130 m., 3 specimens. 



St. 1660. Ross Sea, 74° 46-4' S, 178° 23-4' E, 351 m., 6 specimens. 



