PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 



b 



325 



Figure 16. — Floromctra ausiini sp. nov., holotype: a, Lateral view, division series foreshortened; A, peripheral 

 cirrus of 54 segments; c, Pi; d, Pj of paratype. 



brachials 14 + 15, on two between 13 + 14, on another between 12+13 while on the last 

 where the second syzygy is irregular at 7 + 8 the third is at 11 + 12. 



The IBrj are very short. In direct dorsal view they are completely concealed by 

 the expanded base of the centrodorsal and the well developed proximal angle of the 

 axillary which forms a notable synarthrial tubercle. Even in dorsolateral view only 

 a naiTow strip of the IBr, is visible. The axUIaries are rhombic and considerably wider 

 than the IBrj; their very short sides diverge distally. The distal angle is even more 

 produced and acute than the proximal one and the two distal sides are also very con- 

 cave. The length is 2.5 mm. and the maximum width 2.8 mm. The first brachials 

 are very short and almost completely overlaid dorsaUy by the large proximal angle of 

 the second brachials each of which forms a synarthrial tubercle even more prominent 

 than that of the division series. The second brachials of each pair of arms are dis- 

 tinctly separated from each other although the first brachials are closely united. The 

 first syzygial pair is much wider than long. 



The edges of the brachials are everted and finely spinous but not markedly so. 



Pi has 68 segments and is 20 mm. in length. Most of them are tightly curled up 

 towards the tip where the segments are very short. The basal 6 or 7 segments are 

 notably stouter than the rest and taper more abruptly than the remaining three quarters 

 of the pinnule. They are not noticeably carinate. None of the segments are longer 

 than broad. From about the ninth segment onwards a knob appears on the distal end 

 of the dorsal side which increases markedly in size in the outer half of the pinnule 

 producing a comb very comparable to that of the Comasterids. 



Pa is the longest pinnule with about 77 segments and measures 30 mm. in length. 

 Its segments are relatively longer than those of Pi, all but the first few bemg longer 



