104 Papers from the Department of Marine Biology. 



secured. It was found among the corals on the southwestern reef at Maer. 

 It was noted as an active swimmer and did not endure confinement well, 

 soon throwing off its arms. 



16. Lamprometra tenera (Hartlaub). 



A single specimen was taken on the southwestern reef at Maer, September 

 26, 1913. It was an active and very graceful swimmer. The lower pinnules 

 are stouter and the coloration more variegated and much handsomer than 

 in specimens of tenera from the Marshall Islands. 



17. Lamprometra brachypecha sp. nov. (ppaxvs short + ir^x^s = arm). 

 Centro-dorsal large, thick, flat, 5 mm. in diameter, the base dorsal area 



about 2.5 mm. across. Cirri XXXVI-XLVI, 22-25, distally compressed, all 

 joints wider or higher than long; distal joints with a very inconspicuous and 

 low longitudinal ridge ; opposing claw very small. Arms 39 to 50, notably short 

 (hence the name selected), 50 to 60 mm. long and 10 to 12 mm. wide distal to the 

 middle, composed of about 100 joints; no lateral processes and no tubercles; 

 basal brachials are slightly swollen either at middle or at distalmost corner; 

 first few brachials nearly quadrate, but rapidly becoming low wedge-shape, 

 twice as wide as high, and then gradually becoming quadrate again as the 

 tip of the arm is approached; syzygies between 3 and 4, 15-16 (or 18-19) 

 and then at intervals of 9 to 19 (usually 10) joints. Division series all 2, without 

 syzygies; there may be as many as 10 IV Br series, but they are not necessarily 

 on outer side of arm. Lower pinnules on outer side of every first and fourth 

 arm, much bigger than any others. P! usually about 10 to 12 mm. long, with 

 23 or 24 joints, more or less cylindrical and stiff, but somewhat flagellate at tip; 

 P a about the same. PZ bigger than PI to a greater or less degree, often 13 or 14 

 mm. long and with 25 joints; P 6 similar but smaller. P 3 very small, not half 

 of Pz, with 8 to 11 joints; P c about the same. Succeeding pinnules gradually 

 becoming longer and at middle of arm, 6 to 8 mm. long and composed of 19 or 20 

 segments. All pinnules more or less cylindrical and with perfectly smooth 

 joints. Color, bright green, somewhat variegated with brown and white, and 

 with a broad band of white crossing each arm distal to middle; this band is 

 particularly marked on the oral surface ; between this band and the disk are 

 3 or 4 narrow bands of green; pinnules, at least distally, with yellow tips. 

 The colors slowly undergo some change in alcohol, but the pattern is well 

 preserved. 



In many respects this was the most remarkable crinoid met with at Maer, 

 but unfortunately it was rare and only four specimens were found. They 

 were all taken on the under surface of rock-fragments on the southeastern 

 reef-flat. It was not an active species and I did not see it swim. When the 

 rock was overturned, the arms would be more or less closed over the mouth, 

 the whole animal appearing like a tuft of green sea-weed. On being touched, 

 however, the arms, instantly and all together, were laid back flat against the 

 rock and the broad white band flashed into view. The immediate effect 

 was obliterative and one's first thought was that the animal had vanished. 

 Whether this habit is protective could not be determined from the few obser- 

 vations possible. There is no doubt this species in near Icevicirra, but the 

 small size, short arms, numerous, fewer-jointed cirri and the color are all 

 distinctive. There is a faded specimen in the M. C. Z. collection, from Fiji, 

 which seems to be brachypecha. 



18. Lamprometra callipecha sp. nov. (ica.\Xiirr)xvs = having beautiful arms). 

 Centrodorsal rather small, flat, less than 5 mm. in diameter, the bare 



dorsal area about 3 mm. across. Cirri xxxi, 23-25, about 12 mm. long, 

 distally compressed; basal segments (1 to 3) short and thick, segments 4 to 8 



