270 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



At the time I published my first review of the genus Antedon in 1907 I had not 

 been able to consult Professor Bell's paper; but in 1908 I wrote that Antedon sclateri 

 lickings to the genus Charitometra and is near C. inaegualis. In another paper published 

 later in the same year I noted that Bell had referred Antedon sclateri to Carpenter's 

 Savignyi group whereas it is in reality a member of the Granulifera group and is very 

 close to Charitometra inaegualis. In my revision of the families Thalassometridac (at 

 that time including the Charitometridae) and Himerometridae published in 1909 I 

 established the new genus Pachylometra and listed sclateri under it. In my memoir 

 on the recent crinoids of the coasts of Africa published in 1911 I identified Antedon 

 sclateri as Pachylometra sclateri and gave the synonymy and locality. It was again 

 listed as Pachylometra sclateri in my memoir on the crinoids of the Indian Ocean pub- 

 lished in 1912. After examining the crinoids in the British Museum I recorded 28 

 specimens of Pachylometra sclateri under Pieter Faure numbers 12676 (5), 12711 (7), 

 12792 (4), and 12885/6 (1), and also 11 from the Pieter Faure collection without locality ; 

 but the note on them was that the ccntrodorsal shows radial furrows. In my memoir 

 on the crinoids of the Antarctic published in 1915 I said that Pachylometra sclateri 

 represents the family Charitometridae in South Africa, and gave the range. In my 

 memoir on the unstalked crinoids of the Siboga Expedition published in 1918 sclateri 

 was included in the key to the species of Pachylometra and the synonymy and range 

 were given. In his memoir on the echinoderm fauna of South Africa published in 

 1923 Dr. Hubert Lyman Clark recorded an adult specimen from Pieter Faure number 

 12872 which he said had the calyx about 12 mm. in diameter and the cirri 18-20 mm. 

 long, and in addition what he believed to be the 10-armed young from Pieter Faure 

 numbers 12884 (1) and 13227 (13), giving notes on the latter. 



After studying the comatulids in the British Museum Prof. Torsten Gislen in 

 1928 wrote that the ccntrodorsal in Pachylometra sclateri is discoidal, the cirri are 

 arranged in 10 columns and are without dorsal spines, and the opposing spine is spiny 

 (presumably meaning sharp). The specimens he examined had 11, 14, 16, and 17 arms. 

 In my report on the crinoids of the John Murray Expedition to the Indian Ocean 

 1933-34, published in 1937 I listed Pachylometra sclateri and gave the range. In his 

 paper on crinoids from South Africa published in 1938 Professor Gislen gave notes on 

 and figured four small 10-armcd specimens which he tentatively referred to Pachylo- 

 metra sclateri. The smaller specimens (Nos. 1-3) were from one of the stations from 

 which Dr. Clark's small specimens came; the largest (No. 4) had been collected by 

 Dr. Th. Mortensen. In the last the keel on the dorsal side of the cirrus segments is 

 somewhat more distinct and the lateral sculpture of the arm-bases is a little more 

 obvious, but the general appearance and distance of the syzygies is the same. How- 

 ever, he added, the specimen is still 10-armed and the ossicles of the division series 

 much longer (a characteristic which may of course be an indication of youth) then 

 in the specimen figured by Bell. In fact, he said, the genital pinnules are closely rem- 

 iniscent of Charitometra. Provided that it is not a young of Pachylometra sclateri it is 

 a new species which may probably be most correctly ranged within the 10-armed genus 

 Charitometra. 



The small 10-armed specimens recorded by Dr. H. L. Clark and Professor Gislen 

 as the young of Pachylometra sclateri arc in reality adults of Gislenometra perplexa of 

 the family Colobometridae (see Part 4b, p. 59). 



