330 



BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



ambulacra and are particularly numerous on the oral pinnules (P, and P.). They are 

 far less abundant on the arms. 



This specimen has all the arms broken. It is of medium size (presumably less 

 than 100 mm. arm length, A. M. C); the distance from the proximal edge of the IBr, 

 to the second syzygy (brachials 9 + 10), is about 9 mm. The paratype has a broken 

 centrodorsal and lacks any complete cirri, but its arms are more complete than in the 

 type. It is a slighter, presumably a younger, specimen. The longest arm, which is 

 not quite complete, is of 79 brachials and 45 mm. long. The syzygial pairs beyond 

 the thu-d, 14 + 15, are separated by two brachials. 



The brachials bej'ond the third syzj^gy are triangular and as long as broad. Far- 

 ther out on the arm they become at first wedge-shaped and then rectangular and longer 

 than broad. The distal edges of the brachials, particularly of the outer, are everted 

 and fineh' spinous. 



Pj exceeds the length of Pi even more than in the type; Pi is of 30 segments, 6 mm. 

 long; Ps is of 25 segments and 9 mm. long. P2 carries a very small gonad along the 

 fourth to sixth segments. The genital pinnules extend to P15 or P19. P7 is of 17 seg- 

 ments and 8 mm. long. The distal pinnules are about 9 mm. long and of about 20 

 segments, of which all but the first and second are more than twice as long as broad and 

 have swollen distal ends. The saccuU are regularly arranged. 



The ambulacral skeleton of the pinnules is very reduced. There are side plates 

 in the form of smooth slender rods, straight or curved, two to three to each segment, 

 along the outer segments of the distal pinnules. There are no spicules in the tentacles. 



Notes [by A.M.C.]. — There are in the British Museum four large but broken 

 specimens of Florometra from Discovery station 2493 on the Discovery Bank to the 

 east of Gough Island, collected in 1938 and so not included in the Discovery report. 

 Some details of these are given in table 8 (all dimensions in mm.) : 



The size is very much larger than that of the type specimens but the large number 

 of cirri, the complete absence of dorsal spines on their distal segments, the relatively 

 small number of these segments, the very small bare doreal pole of the centrodorsd, 

 the comblike distal segments of the P, and the smooth brachials coupled with the prox- 

 imity of the two localities leave little doubt that these specimens should be included in 

 Florometra goughi. The larger number of pinnule segments and size of the pinnules 

 and the fact that P4 is usually the first genital pinnule rather than Pj are attributable 

 to the much greater size. Pj has very short segments like Pi and the distal segments 

 are similarly modified into a distinct comb. The longest cirrus segments are two and a 

 half times as long as broad. The size of the proximal angle of the axillaries is variable. 



