A MONOGRAPH OF THE EXISTING CRINOIDS 513 



the Indian Archipelago and Polynesia, no specimens being definitely mentioned, and 

 Antedon amboinensis from Amboina, based on specimens collected by Prof. J. Brock. 

 The last named he compared with Carpenter's Antedon brevicuneata. In his key to 

 the new species described in this paper Hartlaub placed lepida under the heading 

 "postradial series laterally more or less free" and the others under the heading "post- 

 radial series laterally more or less in contact." He distinguished these from each 

 other and from Antedon tenera in the following manner: 



a 1 . Lower pinnules larger on outer arms of each IIBr series than on inner. 



6'. P 2 robust; P 3 very short protecta 



6 2 . Lower pinnules very slender, with a tendency toward carination tenera 



a 2 . Lower pinnules of approximately same size on all arms. 



b 1 . No IVBr series amboinensis 



V. IVBr series present tenera 



In his memoir on the comatulid fauna of the Indian archipelago published in 1891 

 Hartlaub placed Antedon lepida in the synonymy of A. palmata ( = Lamprometra 

 klunzingeri) , which he redescribed from five specimens from the Red Sea in the Berlin 

 Museum collected by Hemprich and Ehrenberg. He also referred to palmata 

 ( = klunzingeri} a specimen from Singapore in the Berlin Museum collected by Jagor. 



Hartlaub redescribed Antedon imparipinna from five specimens from Amboina 

 collected by Dr. J. Brock, placing in the synonymy of this species Antedon protecta, 

 which he had described in 1890, and Carpenter's Antedon aequipinna and A. con- 

 jungens. He listed specimens from Amboina, the Tonga Islands, Batjan, Hongkong, 

 New Guinea, and Ovalau. 



On the basis of five specimens from Amboina he redescribed Antedon brevicuneata, 

 placing as synonyms under it Carpenter's Antedon similis and his own Antedon 

 amboinensis. He gave notes on the type specimen of Antedon brevicuneata, which he 

 had examined at Leyden, and on some specimens from Mortlock Island and discussed 

 at considerable length the relationships of brevicuneata, similis, and amboinensis. 



Edgar Thurston in 1894 recorded Antedon palmata from Tuticorin, Pamban, and 

 East Cheval Par and said that it occurred as a littoral form in the Gulf of Manaar. 

 He gave a short account of its habits. His specimens had been identified by Bell and 

 in addition to the present species included Stephanometra protectus. 



In 1904 Herbert Clifton Chadwick mentioned Antedon palmata as being known 

 from Ceylon, the reference having evidently been taken from the Challenger report, 

 and described as a new species Antedon okelli, which was based upon 22 specimens 

 collected in connection with the Pearl Oyster Fisheries Investigations in the Gulf of 

 Manaar under the direction of Prof. W. A. (later Sir William) Herdman in 1902. 



In my first revision of the old genus Antedon published in 1907, brevicuneata, im- 

 paripinna, laevicirra, occulta, okelli, palmata, and subtilis were all listed separately in 

 the new genus Himerometra. 



In 1908 Chadwick recorded Antedon imparipinna from Suez Bay and Suakim, 

 Harbor, the specimens in reality representing the Red Sea species Lamprometra 

 klunzingeri. 



In my revision of the family Himerometridae published in 1909, brevicuneata, 

 occulta, okelli, palmata, protectus, and subtilis were listed under the new genus Dich- 

 rometra. The name protectus (Liitken) was, although the fact was not stated, taken 



