A MONOGRAPH OF THE EXISTING CRINOIDS 335 



one. From P 4 to about P 10 there is a high crest running from the second to the fourth 

 or sixth segment, which is interrupted at the articulations. 



Eight specimens from Pieter Faure station 1987 show the following characters: 

 (1) The arms are 6+4 + 6+4+4 = 24; (2) there are 6 + 5+4 + 6+4 = 25 arms; 

 (3) The arms are 6+4 + 5 + 7+4 = 26; the ray with seven arms is abnormal; there are 

 two IIBr 4 (3+4) series, each bearing one IIIBr 2 series, one internal and the other 

 external; the external IIIBr series bears outwardly an undivided arm and inwardly 

 a IVBr 7 (3+4) series, the inner arm from which has the first syzygy between brachials 

 14+15, while the outer (adradial) arm has syzygies between brachials 2 + 3 and 14 + 15 ; 

 this last, according to Gislen, is in reality a pinnule that has developed into an arm 

 and is directed ventrally just like a normal pinnule. (4) The arms are 6 + 6 + 5 + 5 + 7 

 = 29; the cirri are XXV, 28-32, from 20 to 24 mm. long; the longest cirrus segments 

 are one-third again as broad as long; P 2 is 9 mm. long, with 23 segments; P 3 is about 

 10 mm. long, with 22 segments. (5) There are 6 + 7 + 6 + 6 + 6=31 arms. (6) 

 There are 6 + 6 + 6 + 7 + 7 = 32 arms about 75 mm. long; the IIBr series are 4 (3 + 4) 

 and the IIIBr series are 2, except in one case. (7) There are 8 + 7 + 6 + 5 + 6 = 32 

 arms; the IIBr series are 2 or 4 (3+4). (8) The arms are 6+6 + 7 + 5( + ) + 8 = 32 + . 



A specimen from Pieter Faure station 2001 has the cirri with 25-27 segments, 

 from 15 to 20 mm. long; the arms are 5 + 5 + 5 + 4, with one broken ray; seven of the 

 eight IIBr series are 4(3+4); two of the three IIIBr series are 2; P 3 is about 10 mm. 

 long with 20 segments. Another specimen from the same station is much broken; 

 there are two loose rays with four and six arms. A third specimen from the same 

 station has 6 + 5 + 5 + 6 + 5=27 arms. 



A specimen from Pieter Faure station 2012 has 29 arms about 75 mm. long; of 

 the ten IIBr series present eight are 4(3 + 4) and two are 2; five of the IIIBr series, 

 four of these following IIBr 2 series, are 4(3 + 4), and four are 2. In another specimen 

 from the same station the cirri are XXXII, 29-33, from 12 to 22 mm. long; the longest 

 cirrus segments are one-third again as broad as long; the arms are 8 + 7+7 + 8 + 9 = 39, 

 75 mm. long; of the ten IIBr series seven are 4(3 + 4) and three are 2; 12 of the IIIBr 

 series are 2, three are 4(3+4), and one is 6(3 + 4); of the three IVBr series two are 2 

 and one is 4(3+4). 



Remarks. Professor Gislen wrote that in the short arms and the relatively few 

 pinnule segments this form approaches H. schlegelii, from which, however, it differs 

 in having at least twice as many arms. In the short cirrus segments it comes near 

 H. flora which has fewer, but much longer, arms. He described this form as a variety 

 of H. africana in order not to increase the number of doubtful and critical species in 

 the genus Heterometra in which, as he quite justly remarks, there are probably too 

 many species at present recognized. It seems to me that the short cirrus segments 

 and brachials suggest a closer relationship with H. flora than with H. africana, and I 

 therefore prefer to regard it as a distinct species related to that form. This is purely 

 a matter of personal opinion in which Profession Gislen is quite as likely to be right as I. 



Localities. Pieter Faure stations 1987, 2001, 2012, ?2079, in the vicinity of 

 Delagoa Bay, Portuguese East Africa; Dr. J. D. F. Gilchrist, ?1925 [Gislen, 1938]. 



