560 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



crinoids of the coasts of Africa I said that there is a similar specimen in the British 

 Museum. In my report on the crinoids of that museum, however, I simply listed 

 two small specimens of D. afra without comment. The other was recorded in the 

 paper cited above as near D. flagellata. Both are from Zanzibar. 



Dr. Hubert Lyman Clark thus described Liparometra multicirra. The centro- 

 dorsal is large and thick, 6 mm. in diameter, with the bare dorsal pole flat or slightly 

 concave, nearly 4 mm. in diameter. The cirri are XLIII, 30-36, cylindrical in cross 

 section basally but distally laterally compressed. The seventh-tenth segments are 

 about as long as broad, or even slightly longer than broad, but the other segments 

 are broader than long. Beginning usually on the tenth or eleventh segment, though 

 on some cirri farther out, there is a median dorsal elevation, which at first is rather 

 blunt but soon has a short compressed tip or even a sharp point. On the last segment 

 this becomes an opposing claw as long as half the lateral width of the segment. The 

 terminal claw is longer than the last segment and is very sharp. The division series 

 are all 2 and are well separated, rounded, and smooth. Low and relatively incon- 

 spicuous synarthrial tubercles occur on all the division series. The arms are about 

 50 in number. They are 75-85 mm. in length. All but two are broken and detached 

 from the disk at or near the base. The brachials are numerous, exceeding 150, the 

 distal ones being quite short. The first syzygy occurs between brachials 3+4. The 

 second syzygy is far out, usually after an interval of more than 21 muscular articula- 

 tions and often 31-41, rarely before the twentieth brachial. Subsequent syzygies 

 are few and are spaced at very wide intervals. 



The lower pinnules are not noticeably larger on the outer side of the arm than on 

 the inner. P! is about 9-10 mm. long and is composed of 17-21 segments, of which all 

 but the basal three are longer than broad and all but the basal five or six are cylindri- 

 cal. P a is similar to PI. P 2 and P b are very similar to PI but are noticeably larger, 

 12-13 mm. long, with 24-26 segments. P 3 and P c are similar to P 2 and are approxi- 

 mately of the same size, or a little smaller with from one to three fewer segments. 

 P 4 and P d are distinctly smaller, about equal to Pj. The following pinnules are 

 somewhat smaller, about 7 mm. long. All the basal pinnules are moderately stout 

 at the base but taper to a slightly flagellate tip which is not, however, very slender. 

 The disk is about 23 mm. hi diameter and is very deeply incised. The disk mem- 

 brane is full of crowded small calcareous plates. The color is pale fawn, with the oral 

 surface of the disk and arms very dark brown, almost black. The margins of the food 

 grooves on the disk are black. 



I examined the type specimen of Liparometra multicirra at the Museum of Com- 

 parative Zoology at Cambridge, Mass., and identified it as Dichrometra afra, from 

 which it differs in no characters not properly attributable to fuller maturity than is 

 shown by the other known specimens. The centrodorsal is considerably larger, the 

 number of arms is about 50 instead of 29 as hi the type specimen of afra, and the cirri 

 are somewhat more than twice as numerous. The longest cirri also have more numer- 

 ous segments. 



In both the type specimen of multicirra and the type specimen of afra the same 

 cirrus segments are the longest and are about as long as or slightly longer than broad, 

 and hi both the dorsal processes begin at the same place. The correspondence hi 

 the relative proportions of and number of segments in the proximal pinnules is as 



