A MONOGRAPH OF THE EXISTING CRINOIDS 273 



and figured Antedon irregularis from specimens secured in the Prince of Wales Channel 

 and in Torres Strait. He remarked that irregularis has some resemblance to decipiens, 

 and gave what he considered the distinguishing characters. 



In 1884 Professor von Graff described the myzostomes found on a specimen from 

 Challenger station 186, the name of the host having been given him by Carpenter as 

 Antedon bidentata. This name appeared again in a notice of myzostomes published 

 in the Challenger narrative in 1885, and in a second contribution on the myzostomes by 

 Professor von Graff published in 1887. Carpenter also used it in an article containing 

 an account of the sacculi in the comatulids published in 1887. 



In the Challenger report upon the comatulids published in 1888 Carpenter gave 

 an exhaustive account of this species — quite the best account that he gave of any 

 comatulid. His description was drawn up from two specimens from Challenger sta- 

 tion 186 and two more collected by the Challenger at the Aru Islands. He used the 

 name Antedon variipinna for the species, including as synonyms under this name his 

 own Antedon crenulata and the Antedon decipiens and A. irregularis of Bell. Unfor- 

 tunately he overlooked the fact that in the descripion of Antedon variipinna he had said 

 that "the distal ends of the cylindrical joints of the large lower pinnules are raised into 

 slight spines," which indicates a species quite different from a form with sharply 

 prismatic pinnules such as his A. crenulata and the two forms described by Bell. 



In his account of Antedon multiradiata (=Zygomelra microdiscus) he mentioned 

 that Antedon bidentata had been secured at the same station (station 187), but he 

 did not include this station among the localities under Antedon variipinna. At the 

 very end of his account of Antedon variipinna he said that the single example of 

 A. variipinna, var. 5 (given in the list of varieties as "Antedon decipiens, var. [Chal- 

 enger]") from the Prince of Wales Channel was serving as host to 14 individuals of 

 myzostomes, and that the name of the host was given in Professor von Graff's report 

 as Antedon bidentata, this being the manuscript name he had applied to it before he 

 had become convinced of its identity with Antedon variipinna or had had the oppor- 

 tunity of identifying it with Bell's A. decipiens. Von Graff, however, gave the locality 

 of this specimen as station 186 instead of station 187 as it was given by Carpenter. 



Carpenter mentioned Antedon dubia several times. He gave it as an example of 

 a 10-armed species occasionally varied by the intercalation of IIBr 4(3+4) series, 

 and as a species in which the second and third pairs of pinnules are especially character- 

 ized by their large size, and he figured it under that name on plate 36, figures 1-6. 

 While he had regarded it as a distinct species when the earlier pages of the Challenger 

 report were going through the press, before the account of Antedon variipinna was 

 ready to be printed he had reached the conclusion that it is merely a synonym of that 

 species. Under Antedon variipinna he said that he had formerly referred the two 

 individuals from the Aru Islands to a new species, Antedon dubia, and discussed them 

 at some length. 



In 1894 Prof. Jeffrey Bell recorded this species, under the name of Antedon 

 variipinna, from northwestern Australia in 9-38 fathoms, and in 1895 Prof. Ren6 

 Koehler under the same name recorded a specimen collected at Biliton by M. Korotnev 

 in 1885 and gave notes on the specimen. Professor Bell in 1902 recorded it from 

 South Nilandu in the Maldives. 



