406 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



material, redescribing the Antedon-Astrophyton association. Prof. F. Jeffrey Bell in- 

 cluded this species in the list of comatulids to which he applied his so-called specific 

 formulae, and P. H. Carpenter in three papers took up certain points in the nomen- 

 clature, structure, and anatomy. Toward the end of the year Prof. Bell described as 

 a variety of this species material which had been dredged by the Alert in the Straits of 

 Magellan (Florometra magellanica) . 



In 1883 P. H. Carpenter emended the specific formula which had been applied by 

 Bell to this species and published some anatomical notes. The Vega material was again 

 discussed by Stuxberg in a German translation of his previous work. 



In 1884 P. H. Carpenter gave a detailed account of this species, recording spec- 

 miens from the Porcupine, Triton, Valorous, Alert, Challenger, and Wittem Barents 

 collections, discussing its characters and nomenclature, and describing two pentacri- 

 noids. At the same time under the name of Antedon quadrata he described what he 

 considered a new species but which has since turned out to be a depauperate form of 

 this. In a second paper dealing primarily with Thaumatocrinus he again discussed 

 the nomenclature and described a pentacrinoid obtained by the Porcupine. In two 

 contributions in this year Prof. Ludwig von Graff discussed the myzostome parasites 

 associated with this species. W. B. Carpenter also mentioned certain features con- 

 nected with the structure of the oral pinnules. 



In 1886 Prof. G. M. R. Levinsen described the Dijmphna collection, which included 

 pentacrinoids and a 9-armed individual for both of which he gave figures; Fischer de- 

 scribed the occurrence of the species at Jan Mayen; and Stuxberg discussed the Vega 

 material. 



P. H. Carpenter in the same year described in detail the material brought back by 

 the Willem Barents, under the names Antedon eschrichti, A. quadrata, A. dentata and 

 A. barentsi. Antedon barentsi, according to Carpenter, differed strikingly from all the 

 other comatulids of the arctic and temperate regions, and resembled those of the Carib- 

 bean Sea andOceania, in the extreme development of "ambulacra!" plates in theperisome 

 of the genital pinnules. It has since been found, however, to be merely a variety of 

 H. glacialis. His record of A. dentata was based upon two calices with portions of the 

 arms attached, one small and the other "fairly mature," from station 6, 1881. He says 

 that these have rather over 20 cirrus segments with forward projecting spines which are 

 much more marked than in individuals from southern Norway. This identifies them at 

 once as specimens of glacialis, similar to those recorded as sarsii by Jarzynsky in 1870 

 from various fjords on the Murman coast. I have examined a number of these from the 

 Kola Fjord sent by Prof. Derjugin. Gislen records (1923) that there are in the Stock- 

 holm Museum other small specimens taken by the Vega west of Taimyr identified by 

 Carpenter as dentata. 



In 1886 also the dimorphism of the cirri was noted by P.H. Carpenter in connection 

 with his studies of the same feature in Leptometra phalangium and in L. celtica ; the nerves 

 were described by Prof. A. Milnes Marshall, and various anatomical points were treated 

 by Prof. [J. O.] Edmond Perrier. 



In 1887 Dr. J. M. Ruijs recorded this species from a number of Varna stations, and 

 some of the Varna specimens, including two pentacrinoids, were described in detail by 

 P. H. Carpenter, who in two additional papers discussed the sacculi and certain points 

 in the morphology. Prof, von Graff contributed further information regarding the 

 myzostome parasites. 



