KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 59. N:0 4- 23 



Concerning other characters that probably distinguish elegans from microdiscus 

 A. H. Clark says in op. cit. 41, p. 21: »Examination of these types shows that 

 this species (elegans) has shorter C:i than the preceding {microdiscus) and small and 

 weak pinnules. » 



I have compared both the specimens described above side by side and found 

 that the C:i are really somewhat smaller and arranged in two rows instead of 3 or 

 4, the cirrals and pinnulars fewer in number, the arms somewhat shorter, the proximal 

 pinnules a little weaker in »elegans », i. e. the specimen from Station 11; still all these 

 characters may be due to different sizes and ages of the specimens. 



Considering that in addition to the difference above mentioned, the specimen 

 from Stat. 11 also has dorsal spines that are a little longer and more aciite, dif- 

 fering colour and the proximal parts of the arms somewhat slenderer, I am inclined 

 to regard Z. elegans as a variety of Z. microdiscus, though it may possibly only be 

 a voiing form of the latter. 



Himcrometridac A. H. Clark. 



Amphimetra A. H. Clark. 



Amphimetra variipinna (P. H. Carp.). 



Åntedon variipinna 1882 P. II. Carpemeu. oi>. cit. 5, p. 50(1: 1888 Chall. Rep., p. 256 II'.: ?1902 

 Uei.i. op. cit., p. 224. 



Åntedon crenulata 1882 P. H. Caepentei: op. cit. 5, p. r>i>7. 



Antedon decipiens 1884 Bell »Alert», p. 159. 



Antedon irregularis 1884 Bell »Alert», p. 161. 



Antedon dulia 1888 P. H. Carpenter Chall. Rep.. Vol. 20. p. 258. 



Antedon brodd Haktlaub op. cit., p. 23. 



Himerometra variipinna 1907 A. II. Clark op. cit. 2. p. 356; 1908 op. cit. 11, p. 210. 



Amphimetra variipinna 1!)09 A. H. Clark op. cit. 12, p. 7: 1911 op. cit. 32. p. 701: 191-2 oj), cit. 

 34, p. 110; op, cit. 38, p. 10; 1914 A. Reicheksperger op. cit.. p. 02: 1 * 1 1 5 A. H. Clark op. cit. 42. 



Amphimetra crenyilåta 1912 A. II. Clark op. cit. 38, p. 16; 1913 op. cit. 41. p. 22; 1915 op. cit. 

 42 and op. cit. 43. p. 223. 



Localities: Stations 7 and 11. 



Cd thickly discoidal, with an almost flat, papillated, dorsal surface, which is 

 3 — 4 mm in width. 



C XXIX, XXIX and XXXV resp. arranged in two rows (in this number are 

 also included soine empty, fresh joint-pits. From a number of these regenerate 

 young pinnules). The segments 38—46 in the exteriör (dorsal), 33—39 in the inte- 

 riör (ventral) cirrus-whorl. Dorsal carination begins in the external row at 19 th — 21 th 

 segment (in an exceptional case already at the 12 th ), in the internal whorl at the 

 14 th — 16 th (in the specimen with XXXV C the segments are 35 — 40; dorsal carina- 

 tion appearing first at the very last segments). Proximal segments laterally flattened, 

 the distal ones compressed from the sides. The former with a length as great as 

 "'. a of the breadth, the latter half as long as thev are broad. First segment short, 



