28 TORSTEN GISLÉN, CRIN01DS. 



that it is incorrect to keep these forms as species on the ground of the somewhat 

 different cirrals in the two species. My specimens should preferably be referred to 

 the milberti-iorm. 



There is also another species that seems to me to be slightly differentiated 

 from this group of forms. I ref er to A. schlegelii. This species is described as 

 smaller (arms 70 mm) with shorter (Pj 5, P 2 7,5, P 3 8 mm) but comparatively many- 

 jointed (18) proximal pinnules, with the sides of the arms proximally flattened and 

 the arm-bases only fused a little, unto 13 arms and fewer C:i. If one compares the 

 specimen from Station 8, one finds that it approaches this species in a great many 

 characters. 1) In the length of the arms. 2) In the length of Pj, P, and P 3 and 

 in their formation (distally thin and slender;. 3) In the fact that the IBr:sl are 

 not grown together but only pressed closely against another. The most important 

 differences are that the arms are 10 and that the segments of the proximal pinnules 

 are 13 and not 18. The former character is to be considered as rather unimportant, 

 but the latter may be of more value though not too significant. One may compare, 

 for instance, the fact that the segments on P a (if I also except the specimen discussed) 

 vary between 14 and 16, on P 2 betvveen 15 and 19, on P 3 between 16 and 17. If one 

 compares this with the fact that the biggest specimens show the highest number 

 of segments, the smallest ones the lowest, it is evident that the number of pin- 

 nulars is subject to certain changes at different ages. The above shows us that the 

 figures taken from the number of segments on proximal pinnules, like so many other 

 similar marks, enable us only with great caution to draw any conclusions as to the 

 possibility of distinguishing the forms in question. Especially in the case of smaller 

 specimens one must always keep in mind the possibility that the above mentioned 

 slight, meristic differences are caused by influences of age and are only to be found 

 in immature animals. 



Though nearly related to Amphimetra milberti, A. schleegelii is probably a good 

 species because of the high number of pinnulars combined with small arms. 



Colohometridae Clark. 



Oligometra A. H. Clark. 

 Oligometra adeonae (Lamarck). 



Comatula udeone 1816 Lamarck op. cit. p. 535; 1862 Du.urdin et Hupe op. cit., p. 200. 



Antedon adeonae 1884 (part) Bell »Alert», p. 156; 1888 P. H. Carpenter Chall. Kep., Vol. 26, p. 206. 



Antedon pinniformis 1884 Bell »Alert», p. 156. 



Antedon bidcns 1884 Bell »Alert», p. 158; 1888 P. H. Cabpenteb Chall. Rep., Vol. 26, p. 206; 1898 



DöDERLEIN Op. Cit., p. 476. 



Oligometra lidens 1908 A. H. Clark op. cit. 4, p. 126; 1909 op. cit. 16, p. 368. 

 Oligometra adeonae 1908 A. H. Clark op. cit. 4, p. 126; 1911 op. cit. 32, p. 776; op. cit. 33, p. 255; 

 1912 op. 31, p. 175; 1914 A. Reiciiensperger op. cit.. p. 105. 



Oligemctrides adeonae 1913 A. II. Clark op. cit. 41, p. 37; 1915 op. cit, 42 and op. 43. p. 225. 



Localities: Stations 4, 10 and 13. 



Cd discoidal — hemispherical. The bare dorsal surface a little arched, with small 

 pits and knöts, 2.5 mm, 



