A MONOGRAPH OF THE EXISTING CRINOIDS 555 



Carpenter in 1881 published a redescription of M tiller's type specimen under the 

 name Antedon flagellata. He said that the general facies of this fine species leaves 

 little room for doubting its oriental origin, but he had never come across a second 

 specimen of it. He said that the specific name, as in the case of Muller's other types 

 in the Leyden Museum (except Aclinometra Solaris), seems to have been a museum 

 name which was adopted by him. 



Carpenter remarked that two Myzostoma cysts occur on the arms of the type 

 specimen that seem to have escaped Mtiller's attention. 



Prof. F. Jeffrey Bell in 1882 proposed specific formulas for Antedon elongata and 

 A. flagellata, which were criticized and emended by Carpenter early in the following 

 year. In the Alert report published in 1884 Professor Bell compared Antedon flagellata 

 with his new species Antedon (= Lamprometra) gyges. He also published a rede- 

 scription of the type specimen of Muller's Alecto elongata under the name of Antedon 

 elongata. 



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

 elongata and flagellata in his key to the species of the Palmata group of Antedon; 

 elongata was said to have the postradial series well separated, no IVBr series, and the 

 second syzygy about the fourteenth brachial, while in flagellata the postradial series 

 are in close contact and slightly flattened laterally, IVBr series are present, and the 

 second syzygy is about the twentieth brachial. These two species were differentiated 

 from bimaculata by having spiny cirri, and all three were differentiated from the re- 

 maining species of the Palmata group by having P 3 larger than P 2 . 



Dr. Clemens Hartlaub in 1891 redescribed Antedon elongata from a specimen from 

 Amboina that had been collected by Dr. J. Brock. He compared this specimen 

 directly with the type specimen at Leyden and gave in detail the differences between 

 them. He said that elongata seemed to be a rare form, as the single example pre- 

 viously known was the type, and he had not seen another among the comatulids either 

 in Berlin or in Hamburg. He also redescribed Antedon flagellata in detail on the basis 

 of three specimens from Singapore, two in the Berlin Museum collected by Jagor and 

 one in the Gottingen Museum collected by Prof. Edouard von Martens. He com- 

 pared these with the type specimen at Leyden and recorded another specimen from 

 the Pelew Islands that he had found in the Hamburg Museum bearing the manuscript 

 name Antedon pulcher Ltitken. He included elongata and flagellata in his key to the 

 species of the Palmata group, using the differential characters employed by Carpenter. 



In my first revision of the old genus Antedon published in 1907, elongata and 

 flagellata were placed in the new genus Himerometra, and in my revision of the family 

 Himerometridae published in 1909 they were both transferred to the new genus 

 Dichrometra. 



In a paper on the crinoids of the Copenhagen Museum published in 1909, I 

 recorded and gave notes on five specimens of Dichrometra flagellata from Singapore 

 that had been collected by Svend Gad, the Danish consul at that port. 



In a paper on the crinoids of the coasts of Africa published in 1911, I listed 

 Dichrometra flagellata from Lamu and Zanzibar, taking the records from Ludwig, 1S99, 

 and said that the species ranges eastward to Singapore, New Guinea, and Amboina. 

 New Guinea and Amboina are included on the basis of the type specimen of Alecto 

 elongata from New Guinea and the specimen of Antedon elongata from Amboina 



