182 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



two are of the ordinary type, with a syzygy in the third brachial [i. e., between brachials 

 3+4]." He said that "should the tridistichate condition eventually prove to be common 

 in these two species, it may become necessary to unite them under one name. At 

 present the main points of difference between them, apart from the characters of the 

 arm-divisions, appear to lie hi the longer cirri and less spinous arms of A. lusitanica, 

 in which also the joints of the genital pinnules, as the Madeira specimens show, are some- 

 what produced upward on the outer side, as is so markedly the case in Antedon [Chari- 

 tometra] basicurva, but there is nothing of this kind in A. multispina." 



In 1895 Dr. Clemens Hartlaub discussed the systematic and bathymetrical rela- 

 tionships of Antedon multispina and compared it with his new species A. (Thalassometra) 

 agassizii. In 1905 Wilhelm Minckert discussed the distribution of the syzygies in 

 A. multispina. 



In my revision of the genus Antedon published in 1907 multispina was assigned to 

 the new genus Thalassometra, and in two papers published in 1908 Thalassometra multi- 

 spina was said to belong to a group characteristic of the oceanic area. In my revision 

 of the family Thalassometridae published in 1909 Thalassometra multispina was listed. 

 In a paper on the crinoids of the coasts of Africa published in 1911 I included Th. 

 multispina, giving the synonymy and the record from near Ascension. 



Dr. Clemens Hartlaub, in discussing Carpenter's Granulifera group in 1912, said 

 that, without expressing a definitive judgment, in his opinion Antedon angusticalyx, 

 A. inaequalis, and A. distincta were synonyms of A. granulifera, but that A. porrecta 

 and A. multispina, were doubtless distinct. 



In a paper on the crinoids of the British Museum published in 1913 I noted that 

 I had examined two specimens and one pentacrinoid young from Challenger station 344, 

 and that the spines covering the animal are exceptionally fine. In my report upon the 

 unstalked crinoids of the Siboga expedition published in 1918 multispina was included 

 in the key to the species of Thalassometra and the range was given as near Ascension 

 Island in 756 meters. The references given under Thalassometra multispina included 

 both multispina and setosa. In my report on the crinoids of the Ingolf expedition 

 published hi 1923 I listed Thalassometra multispina, saying "Only known from near 

 Ascension; 768 metres." The specimen from off Tristan da Cunha in 1,005 meters I 

 listed as Thalassometra setosa. Both multispina and setosa were included in my key to 

 the species of Thalassometra. 



Prof. Torsten Gislen in 1928 gave notes on a young specimen of Thalassometra 

 multispina and said that older specimens had fewer cirri. He gave the locality as 

 Challenger station 135G, which is the locality for Th. setosa; but all but one of the speci- 

 mens must have come from station 344, the locality for Th. multispina. 



In 1929 I compared a new species, Thalassometra peripolos from the Nicobar Is- 

 lands, with Th. multispina. Professor Gislen hi 1935 discussed the arm structure of 

 Thalassometra multispina. 



THALASSOMETRA SETOSA (A. H. Clark) 



Antedon, sp. WYVILLE THOMSON, The Atlantic, vol. 2, 1877, p. 193 (near Tristan; 550 fathoms). 

 Antedon setosa P. H. CARPENTER, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 34 (off Tristan 



da Cunha; nomen nudum). 

 Anledon multispina (part) P. H. CARPENTER, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 248 



(station 135G; notes), pi. 50, figs. 3-6, and following authors. 



