10 '■ ENDEAVOUR " SCIENTIFIC RESULTS. 



there are more or less evident median tubercles on a dozen or 

 fifteen of the terminal segments ; there tend to be two on each 

 segment but they are very low and small as a rule. Cirri 

 transversely oval in cross-section at base, but soon become 

 cylindrical and distally more or less laterally compressed. 

 Fully developed cirri have a smooth, polished surface, as 

 usual. 



Basals rather prominent, somewhat produced downward 

 over the angles of the stem, broadly in contact laterally. 

 Radials two or three times as wide as high, with a marked 

 proximal angle (between the basals) and a distinctly concave 

 distal margin. IBr normally 6 (1+2, 4+5), ^ but often 7 

 (1+2, 4+5), occasionally 5 (1+2) and rarely 4 with no 

 syzygy. Axillary triangular, almost as high as wide, lateral 

 angles truncate, distal angle somewhat rounded. Pinnules 

 on second, third and fifth segments and on sixth when seven 

 are present. IIBr 6-11, usually 9 or 11, not rarely 7, but 6 

 only in one instance ; a syzygy between 3 and 4 ; in one 

 instance the syzygy is between 2 and 3 instead. Illfr 

 almost always present, 9-21, usually 13 or 15 ; a syzygy 

 between 3 and 4. IVBr often present, 16-27, usually 19 or 

 21 ; more generally present on the outer, than on the inner 

 IIIBr series. Arms 45-60 (57 in ho lo type), with about 140 

 brachials after the IVBr series ; articular tubercles slightly 

 indicated ; dorsal surface smooth ; beyond the IIIBr 

 axillary the brachials have somewhat flaring distal margins, 

 more or less spinulose at first, but becoming smooth near arm 

 tip ; distally the arms are somewhat compressed ; the arms of 

 the ho lo type are more than 200 mm. from the radial to the 

 tip. Oral surface of arms with nmnerous granules and little 

 plates, which are particularly crowded along the margins of 

 the food-groove. 



Pinnules rather stout, four-sided, somewhat flattened ; each 

 segment is more or less concave or hollowed out on both the 

 proximal and distal sides ; this is very marked on distal side 

 of first pinnule but on the second is nearly wanting, the distal 

 margin of the latter being compressed and keel-like ; subse- 

 quently the concavity of the distal and proximal sides of the 

 pinnules becomes a constant feature ; the oral surface of each 

 pinnule is provided with granules which guard the food- 

 groove ; the terminal half of each pinnule is thus covered 

 orally by a double, interlocking series of pointed granules. 

 First pinnule (that on IBr 2) about 20 mm. long with 17-18 

 segments ; second somewhat longer ; third a little longer than 



1. Not counting the radials themselves, of course. 



