A MONOGRAPH OF THE EXISTING CRINOIDS 



771 



Figure 48. — Thaumatocrinus investigatorii sp. nov., B.M., 1937. 

 2.25.29, John Murray station 1S8, part of arm with axillary. 



mm 



branch there arc syzygies at 2 + 3 and 6+7, on the other the first syzj'gy is at 5 + 6. 

 The pinnules on the main portion of the arm are all moniliforni, each bearing ventrally 

 a linear series of eggs; those on the two regenerated arm branches have not as j-et de- 

 veloped eggs. The brachials in the main portion of the arm are very obliquely wedge- 

 shaped, almost triangular, somewhat longer than broad, and slightly constricted cen- 

 trall}'. The brachials in the two regenerated branches are much longer than broad. 

 The intersyz^-gial interval is 4 muscular articulations. 



The third fragment is a continuation of the left regenerated branch of the pre- 

 ceding one. It is 17 mm. long and consists of 11 brachials. 



The individual from which these fragments came was a female. The genital 

 pinnules bear on the ventral side a linear scries of entirely closed globular sacs, broadly 

 in contact, and completely enclosed exteriorlj^ by large thin plates, one to each segment, 

 giving the ventral surface of tlie pinnules a moniUform appearance. Tlie transverse 

 septa between the sacs are very thin. Each sac contains a single large egg. 



Localities. — Investigator sivi.{\on 124; off the Laccadive Islands (lat. 10°47'45" N., 

 long. 72°40'20" E.); 12S5 meters; coral bottom; November 21, 1S91 [A. IT. Clark, 

 1912] (1 arm, I.M.). Type locality. 



John Murray Expedition station 158; oflF the Maldive Islands Qat. 4°42'30" N., 

 long. 72°42'30" E. to 4°36'4S" N., 72°48'54" E.); 914 metcre; AprU 7, 1934 [A. H. 

 Clark, 1937] (3 fragments, B.M.). 



