239 



The example from Stat. 173 is slightly smaller than the one just described, with the 

 axillaries and brachials proportionately slightly longer. 



One of the individuals from Stat. 251 has the centrodorsal hemispherical, the base 

 slightly elongated, the distal border of the radials prominently everted and broken up into five 

 or six laroe rounded bead-like tubercles of which the central one is rather larper than the 

 others, and similar tubercles along the lateral borders of the IBi^ and the outer thirds of the 

 contiguous borders of the IBrj and IBr..,. The others, which are smaller, have conical centro- 

 dorsals, and plain and unmodified IBr series and lower brachials-, owïng to the non-development 

 of tubercles on the distal angdes of the IBr, and beneath the lateral an°des of the axillaries 

 there are large water pores between the IBr series. 



The specimens from Stat. 254 resemble the smaller individuals from Stat. 251. 



2. Nanometra bowersi (A. H. Clark). 



A. H. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. 144 {Antedon minor; name 



preoccupied); p. 148 {Antedon bowersi). 

 Smithsonian Miscellaneous Collections (Quarterly Issue), vol. 50, 1907, part 3, p. 341 



{Antedon orientalis); p. 349 {Nanometra minckerti; new name for Antedon minor, preoccupied). 

 Proc. U.S. National Museum, vol. 34, 1908, p. 318 {Nanometra bowersi; here considered 



as including Antedon minor and Antedon orientalis). 



5 th Subfamily Isometrinae A. H. Clark. 



The only genus in this subfamily is Isometra, of which a complete account will be found 

 in "Die Crinoiden der Antarktis", pp. 145 — 146 v ). 



6 th Subfamily Heliometrinae A. H. Clark. 

 Key to the Genera of the Subfamily Heliometrinae. 



a 1 10 radials and 20 arms (coasts of the Antarctic continent, and 



Kerguelen I si and; 18 — 400 Metres) Promachocrinus 



a 3 5 radials and 1 o arms 



b 1 each brachial bears a high median carinate process ; Pj much longer 

 than P., (coasts of the Antarctic c o n t i n e n't ; 2 2 3 — 400 [? 900] 



Metres) Anthometra 



b 2 no carinate processes on the brachials 



c 1 brachials very short, much broader than long; middle and distal 

 pinnules with very short segments which are rarely longer than 

 broad; cirrus segments very short, only very few, or none at all 

 longer than broad ; P, and P, of approximately the same length 

 ( v i c 1 n i t y of H e a r d I s 1 a n d , and the winter quarters 

 of the "Discovery"; 135 — 270 Metres) Solanometra 



I) Deutsche Siidpolar-Expedition, vol. 16 (Zoölogie, vol. S), May 16, 1915. 



