252 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



station 212 the ridges bordering the interarticular ligament fossae above run almost 

 vertically upward for some little distance and then curve outward, so that the size of 

 the muscular fossae above them is greatly reduced. Farther on he said that the only 

 Antedon he knew that in the relation of the interarticular ligament and the muscular 

 fossae presents features at all resembling those of Actinometra (that is, the Coma- 

 steridae) is the anomalous Challenger species from station 212. In this the arrange- 

 ment of the ridges is essentially the same as it is in Actinometra, though the shape of 

 the distal faces of the radials is somewhat different. The specimen which he dissected 

 was the fragment identified (in 1888) as Antedon quinduplicava which had lost its 

 cirri, disk, and most of its arms. As it was practically useless in this condition, he 

 made a preparation of its calyx. 



In the Challenger report on the stalked crinoids published in 1884 Carpenter 

 mentioned an Antedon in which one of the rays consists of five joints, the axillary being 

 a syzygy. This was the specimen he later (1888) described under the name of 

 Antedon clemens. 



In the Challenger report on the comatulids published in 1888 Carpenter described 

 Antedon clemens in the Palmata group and Antedon anceps and A. quinduplicava in 

 the Savignyi group. Antedon anceps he also placed in his key to the species of the 

 Milberti group and he noted it among the species of that group collected by the 

 Challenger for the reason that one of the specimens had only 10 arms. He said that 

 the single specimen of Antedon clemens is unique in every way, but he had some 

 doubts as to the propriety of separating A. quinduplicava from A. anceps. The three 

 specimens identified as Antedon anceps, the single specimen and fragment of another 

 determined as A. quinduplicava, and the single specimen described as A. clemens all 

 came from Challenger station 212. 



Dr. Clemens Hartlaub in 1891, following Carpenter, included clemens in his key 

 to the species of the Palmata group, and anceps and quinduplicava in his key to the 

 species of the Savignyi group. 



Prof. Rene Koehler in 1895 recorded and gave notes upon two specimens identified 

 as Antedon anceps from Biliton. 



In my revision of the old genus Antedon published in 1907, anceps, clemens, and 

 quinduplicava were referred to the new genus Himerometra. 



In 1908 I recorded Himerometra quinduplicava from Albatross station 5139, and 

 also from the Albatross Philippine collection with no definite locality, and Himerometra 

 anceps from Albatross station 5147 and from the Philippines with no definite locality. 



In my revision of the family Himerometridae published in 1909, 1 referred anceps 

 to my new genus Amphimetra, while quinduplicava was assigned to the new genus 

 Heterometra; clemens was not mentioned. 



In a paper on the crinoids in the Zoological Museum at Copenhagen published 

 in 1909, I recorded and gave notes upon two specimens of Heterometra quinduplicava 

 from Singapore. 



In a paper including descriptions of five new comatulids published on August 23, 

 1909, I established the new species Craspedometra aliena. The type specimen of this 

 supposed new form was an example of Heterometra crenulata, but other examples 

 included under this name in reality represented quinduplicava. 



