I 20 



This species is most closely related to />. mollis trom Kurrachi from which it differs 

 in having the cirri slightly stouter witli most of the segments twice as bruad as long or «ven 

 somewhat broader instead ol only slightly broader than long as in D. mollis; in having the 

 proxiraal pinnules, while ol 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 

 »s marked. 



A specimen before me which I refer to D. mylitta, dredged near Jolo, Philippine Islands, 

 in 20 fathoms "Albatross" Stat. 5139; Cat. X" 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 laevipinna (A. H. Clark). 



A. II. Cl. ark. Ann. and May. Nat. Hist, series 8, vol. 10, 1912, p. $j [Promelra laevipinna). 

 :. 213. Saleyer. Keef. 1 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, occirrring 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. P, 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 tifth, and on the outer very slightly longer than broad; from the third 

 segment ontward the pinnule is rather strongly prismatic with a prominent rounded ridge 

 running along the centp' oi the outer surface. P 3 is 6.5 mm. long with 17 segments, resembling 

 P, but slightly more slender ba ally 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. 1' is 

 4.5 mm. long with 14 segments, similar to 1', but proportionately smaller and more slender 

 distally. 1', is 3.5 mm. long with [3 segments, small and slender. P, is similar, 3.0 mm. long 

 with 11 segments. IV is similar to I', 3.0 mm. long with 12 segments. The distal pinnules 

 very slender, 7.0 mm. long with 20 — 22 segments. 



