ASTEROIDEA 227 



well as different in form. They are characteristically more numerous, since the heavj^ 

 spine-sheaths carry at about mid-height of the disk and carinal spines 5-8 in a complete 

 wreath. On the side of the superomarginal spines toward carinals there are 1-5, and on 

 the inferomarginals 1-3 on the upper side. Along the furrow face of adambulacral 

 plates is a moderate number (which will undoubtedly increase with age) of lanceolate 

 pedicellariae. Typical pedicellariae from different locations are figured. 



The presence of i or 2 rudimentary actinal spines probably indicates that the series is 

 well developed in large specimens, as are probably also dorsolateral spines. Madreponc 

 plate small, situated at mid-r on outer side of a small primary interradial spine. 



Type locality. St. 1872, east of Joinville Island, Antarctic Archipelago, 63° 29-6' S, 

 54° 03-1' W, 247 m., 2 specimens, i very small (R 6-5 mm.). 



Remarks. There is no chance of confusing this species with N. armata, which carries 

 I or 2 enormous major pedicellariae at the base of abactinal and superomarginal spines. 

 A^. haswelli has uniformly small major pedicellariae (usually 0-45 mm. in length) which 

 are distributed in great abundance all over the dorsal surface. These pedicellariae 

 resemble those of stolophora in having short "handles" to the blades, or jaws. These 

 handles are more developed however than in stolophora, much less so than in armata and 

 bongraini. The pedicellariae alone will distinguish the form I have called bongraini in 

 which the large (i -8-2 mm. long) major pedicellariae are attached to the thickened 

 sheath of the carinal spines, forming what is essentially a circumspinal wreath. 



The young specimen has R 6-5 mm., r 2-5 mm., 6 carinal, 6 superomarginal, 6 or 7 

 inferomarginal spines. The major crossed pedicellariae, few in number, are at the stage 

 of development shown in Fig. J, i ^. 



Notasterias bongraini (Koehler) 

 (Fig. J, 3-3 «, 2c, d, e) 



Atitastertas bongraini Koehler, 1912, p. 26, pi. 2, figs. 10, 11; 1920, p. 74, pi. 6, figs. 5-10; pi. 59, 

 fig. I. — Fisher, 1920, p. 244. 

 St. 1957. Off south side Clarence Island, South Shetlands, 830 m., 3 specimens. 



The largest specimen measures R 53 mm., r 10 mm., br 11-12 mm. The other two 

 are small having R 17 and 20 mm. 



Although Koehler's original specimens were taken at King George Island, South 

 Shetlands, 420 m., the Discovery specimens are different in having more numerous 

 macrocephalous pedicellariae and by no means uniformly monacanthid adambulacral 

 plates. In the large specimen, for instance, in one adambulacral series chosen at random 

 the following plates, counting from base of ray, have 2 spines: 15, 28, 38, 48, 52, 54, 56, 

 72, 79, 81, 88, 89 (series ends at 106). The incidence on another ray is 2, 10, 11, 15, 16, 

 17, 40, 51, 52, 67, 69, 75. Ahhough Koehler states that the adambulacral spines are in a 

 single series, the photograph of a type (1912, pi. 2, fig. 1 1) shows a very few diplacanthid 

 plates. Of the two small specimens one has very few diplacanthid plates while in the 



