4 F. JEFFREY BELL. 



of a self-dissected specimen which is, I think, clearer and more illuminating than the 

 originals of the ' Challenger ' report. It would be of particular interest to discover 

 fossil examples of this ten-rayed form ; at present, all we can say as to the 

 " permanency " of the form is that it has endured for thirty years ; as to the 

 polyphyletic origin of the genus which Dr. Bather suggests,* we can only say that 

 we have only such data as are given by the distribution of the genus. Though 

 Dr. Minckert had made two genera, he has not contributed to the elucidation of 

 Dr. Bather's suggestion. 



Taken at East end of Barrier, 100 fms. ; off Coulman Island, 100 fms. ; and at 

 Winter Quarters. 



Antedon adriani. 



(Plate II.) 



This new species is represented by a number of specimens ; as I have already 

 named a member of the genus A. wilsoni, I take the specific name from the second 

 Christian name of Mr. E. A. Wilson, M.B., surgeon and naturalist to the Expedition. 



It was taken at various depths, down to 130 fms., at Winter Quarters, and at 

 500 fms. off Mts. Erebus and Terror. 



At first sight this species does not recall the northern A. eschrichti, but it shows, 

 on analysis, some striking points of resemblance — the shape of the centrodorsal, the 

 length (but not the number of the cirri), and the shapes of their joints, as well as 

 the form of the first brachial ; but what distinguishes the creature from all Antedons 

 known to me is the saw-like appearance of the arms when viewed from the side, 

 and well shown in the figure ; this is due to the presence of a well-marked square 

 protuberance on the dorsal face of most of the arm-joints. 



Arms ten, centrodorsal semicircular, with three rows of cirri ; ' these are from 

 50-60 in number, may be 60 mm. long, and may have as many as 60 joints ; the 

 axillary has a prominent knob, and the outer edge of the first brachial is twice as 

 long as the inner ; the arm-joints are stout, laterally compressed, and nearly all have 

 one or two dorsal spinous processes ; syzygies are extraordinarily rare in the 

 proximal part of the arm, where, too, the pinnules are rather short ; further out 

 they are better developed. No specimen is anything like perfect. 



Antedon Antarctica. 



Antedon antarctica, P. H. Carpenter, Chall. Rep. Comatulae (1888), p. 144. 



I have compared a single specimen taken at Winter Quarters with those 

 collected by the ' Challenger ' at Heard Island, and have no doubt of their identity. 

 Some young specimens, which appear to belong to this species, were also taken. 



* Treatise on Zoology iii. (1900), p. 195. 



