A MONOGRAPH OF THE EXISTING CRINOIDS 329 



of which is often not filled up by any calcareous network, so that the ventral surface of 

 the rosette is more or less visible through it. He said that a few comparatively young 

 specimens were obtained by the Challenger at Bahia. These differ from the more 

 mature individuals in the greater length of the brachials and of the cirrus segments, 

 and in the more convex shape of the centrodorsal, only a small portion of which is 

 free of cirri. 



He noted that a few years after the publication of Dujardin and Hup6's mono- 

 graph (1862) Dr. C. F. Liitken had given the name Antedon braziliensis to a type that 

 had been obtained at Rio de Janeiro and has since proved to be very abundant on 

 the Brazilian coast at the Abrolhos Islands and also at Bahia. Examples of it with 

 Lutken's name attached were distributed to various museums. He said that it is 

 now practically certain that Lutken's Antedon braziliensis and the form doubtfully 

 referred by Verrill to Antedon dubenii are both identical with the species (carinata) 

 from the Indian Ocean. He quoted the conclusions of Pourtales and Rathbun and 

 said that he was fortunately able in the autumn of 1880 to examine carefully the 

 material in several continental museums from a considerable variety of localities. 

 The results of this study led him to acquiesce in their conclusions, which were also 

 adopted by Ludwig two years later. 



Under the name Antedon diibeni Carpenter described a single specimen that had 

 been dredged by the Challenger at Bahia. When he wrote this description he had 

 before him, in addition to the Challenger specimen from Bahia, the type specimen of 

 Bohlsche's Antedon dubenii, which is a true Antedon in the present restricted sense 

 (see Part 5), and a few of the details in the description were taken from the latter 

 (see page 299). He gave excellent figures of both specimens. 



In a detailed account of the anatomy of crinoids published in 1889 Dr. Otto 

 Hamann gave a minute description of the nervous system of Antedon carinata based 

 upon material from Bahia that had been sent him by Carpenter, and in the same year 

 Dr. F. A. Bather mentioned the 6-rayed "Antedon" recorded by Carpenter in 1888. 



In a paper on a collection of crinoids from Madeira published in 1891 Carpenter 

 said that the type specimen of Antedon diibeni was obtained at Rio de Janeiro, and 

 another example (in reality a young Tropiometra carinata) was obtained by the 

 Challenger at Bahia. He said he had much doubt as to Antedon diibeni being a good 

 species, and added that the specimens of A. diibeni from Madeira (see Part 5) are 

 unquestionably identical with those from Brazil, this being a point of some importance 

 as it adds another to the species of crinoids which occur on both sides of the Atlantic. 



In 1891 Dr. Clemens Hartlaub mentioned this species as one having an extra- 

 ordinarily wide range, and included it in his list of species represented in the Gottingen 

 Museum. 



Prof. Percival de Loriol in 1893 published a detailed account of a collection of 

 echinoderms that had been made by V. Robillard at Mauritius. In this collection 

 there was a small number of dried specimens of Tropiometra carinata. Professor de 

 Loriol said that these were sufficiently well preserved to admit of accurate identifica- 

 tion, but that they furnished no additions to Carpenter's complete description. He 

 added that a very perfect specimen collected at Rio de Janeiro failed to show any 

 differences when compared with those from Mauritius. 



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