I20 
This species is most closely related to D. mollis from Kurrachi from which it differs 
in having the cirri slightly stouter with most of the segments twice as broad as long or even 
somewhat broader instead of only slightly broader than long as in D. mollis \ in having the 
proximal pinnules, while of about the same proportions as those of D. mollis, relatively longer 
and stouter and composed of somewhat shorter segments ; and in having the synarthrial tubercles 
less marked. 
A specimen before me which I refer to D. mylitta, dredged near Jolo, Philippine Islands, 
in 20 fathoms ("Albatross" Stat. 5139; Cat. N" 35338, U.S. Nat. Mus.), with an arm length 
of 57 mm., agrees with one of those above described in having the cirrus segments somewhat 
longer than usual, and more like those of D. mollis. 
It is possible that D. mylitta is only a variety of D. mollis., and it may be that in 
reality they are identical. 
2. Decametra laevipiima (A. H. Clark). 
A. H. Cl.\RK. Ann. and ]\Iag. Nat. Hist., series 8, vol. 10, 1912, p. ij [Prometra laevipiima). 
Stat. 213. Saleyer. Reef, i Ex. 
The centrodorsal is discoidal with a broad flat circular dorsal pole 2 mm. in diameter; 
the cirrus sockets are arranged in a single closely crowded marginal row. 
The cirri are XIV, 18 — 23, 13 mm. long; the first segment is very short and the 
following gradually increase in length, after the tenth or eleventh being about as long as 
broad; the first segment has the distal dorsal edge produced; on the second and third this 
becomes a strong transverse ridge which gradually moves anteriorly, becoming median on the 
eighth and following, and appearing as a minute median spine in lateral view; this ridge shows 
no tendency to resolve itself into paired spines or tubercles, nor does it narrow appreciably 
on the outer segments, occurring as a broad transverse ridge even on the antepenultimate; 
the opposing spine is small, slender, median, erect, about equal to one fourth of the lateral 
diameter of the penultimate segment in height. 
The arms resemble those of the other species of the genus, and are about 50 mm. 
long. Pj is 5.5 mm. long, moderately slender, somewhat stiffened, with 14 — 15 segments of 
which the first is short, the following gradually increasing in length and becoming about as 
long as broad on the fifth, and on the outer very slightly longer than broad; from the third 
segment outward the pinnule is rather strongly prismatic with a prominent rounded ridge 
running along the centre of the outer surface. P^ is 6.5 mm. long with 17 segments, resembling 
Pj but slightly more .slender basally and tapering more evenly to the tip, and not so strongly 
prismatic: the outer edges of the segments of both these pinnules are perfectly smooth. P., is 
4.5 mm. long with 14 segments, similar to P„ but proportionately smaller and more slender 
distally. Pj is 3.5 mm. long with 13 segments, small and slender. P. is similar, 3.0 mm. long 
with II segments. P^ is similar to P., 3.0 mm. long with 12 segments. The distal pinnules 
are very slender, 7.0 mm. long with 20—22 .segments. 
