OF THE LEYDEN MUSEUM. 187 
Aru Islands (von Rosenberg). — The dorsal pole 
of the centrodorsal is flat and rather broad. The cirri are 
XXII, 24—28. There are thirty-seven arms; the division 
series are entirely free laterally, though close together. The 
eighth to eleventh cirrus-segments are very slightly longer 
than broad; the last ten or twelve are rather sharply 
carinate, in dorsal view showing a dorso-ventrally elongate 
tubercle. The proximal pinnules resemble those of the 
slender pinnuled varieties of D. protectus; the second and 
third segments of the lower pinnules are slightly carinate. 
The division series of this species resemble those of D. 
protectus; in fact the whole animal is so much like the 
slender pinnuled form of D. protectus that I should not 
be surprised if they eventually proved to be identical. The 
earlier pinnules on the outer side of the outer arms are 
considerably larger than the others. 
Dichrometra palmata (J. Miiller). 
Alecto palmata 1841, J. Mitturr, Archiv fiir Naturgeschichte, 
1841, I, p. 144. 
Dichrometra palmata 1909, A. H. Crark, Proc. Biol. Soc. 
Washington, vol. 22, p. 18. 
For a detailed synonymy of this species see Proc. 
U. 5. Nat. Mus., vol. 39, p. 691. 
Djeddah (J. A. Kruyt). — The cirri are lost. There 
are twenty-seven arms. P, has twenty-five segments, and 
is twice as long and large as P,, smooth, the segments 
becoming squarish on the fourth, then slightly longer than 
broad, and terminally twice as long as broad. P, is con- 
siderably smaller than P,, being basally only about as 
large as P,; the division series are widely separated, and 
the lateral edges of the segments are tending to round 
out laterally into lateral processes, as is the case in some 
specimens of. D. protectus. 
Notes from the Leyden Museum, Vol. XX XIII. 
