I 2 I 



3- Decametra parva (A. H. Clark). 



A. H. Clark. Ann. and Mag. Nat. Hist., series 8, vol. io, 1912, p. 39 {Prometra parva). 



Stat. 260. 5 36.5 S., I32°55'.2E. 90 Metres. 1 Ex. 



Stat. 315. Anchorage east of Sailus Besar, Paternoster Islands. Up to 36 fathoms. 2 Ex. 



The cirri are XIV, 14 — 15, 5.5 mm. long, and resemble those of D. minima-, the sixth 

 or seventh and following segments are about as long as broad. 



The ten arms are 40 mm. long; the lower discoidal brachials are smooth, but those 

 following have rather strongly everted dtstal ends. 



Pj is 2.3 mm. long with 11 segments; it tapers rather rapidly in the first four segments, 

 more gradually from that point onward; the first segment is short, the second slightly longer, 

 the third slightly broader than long, the fourth slightly longer than broad, the fifth and following 

 about twice as long as broad; P 2 is from 3.5 mm. to 4.5 mm. long with 11 segments, evenly 

 tapering, much larger and stouter than the other pinnules, though not greatly enlarged ; the 

 first segment is short, the second half again as broad as long, the third slightly broader than 

 long, the following gradually increasing to the seventh which, with the following, is twice as 

 long as broad ; the pinnule is rather strongly prismatic, and the fourth and following segments 

 have their distal edges produced at the prismatic angles into prominent short stout spines which 

 increase in prominence distally. P 3 is 1.5 mm. long, small and weak, with eight segments of 

 whieh the distal are elongated. P 4 is slightly smaller than P 3 . The distal pinnules are exceedingly 

 slender, 4.0 mm. to 4.5 mm. long with 13 segments of which the second and third are slightly 

 carinate and the outer are greatly elongated. 



The second specimen from Stat. 315 has the arms 35 mm. long and the cirri VII, 

 14 — 15, 5.5 long; P 2 is not quite so much enlarged as in the one described. 



In addition to the three noticed above I have before me two specimens of this species 

 from near Joló, Philippine Islands, in 13 fathoms (" Albatross" Stat. 5557; Cat. N° 36022 

 U. S. Nat. Mus.). 



4. Decametra minima (A. H. Clark). 



A. H. Clark. Ann. and Mag. Nat. Hist., series 8, vol. 10, 1912, p. 38 [Prometra minima). 



Stat. 79a. 2°38'.5S., H7°46'E. (Borneo Bank). 54 Metres. 1 Ex. 



Stat. 117. i°o'.5 N., 122° 56' E. (Kwandang Bay entrance). 80 Metres. 24 Ex. 



Stat. 144. Anchorage north of Salomakiëe (Damar) Island. 45 Metres. 1 Ex. 



Stat. 260. 5°36'.5S., i32°55'.2E. Near Kei Islands. 90 Metres. 1 Ex. 



The centrodorsal is thin discoidal, the dorsal pole flat, finely papillose, 1 mm. in diameter. 



The cirri are X (rarely any other number), 10 — 12, 3 mm. to 4 mm. long; the first 

 segment is short, the following increasing 1 in length to the fifth or sixth which, with the following-, 

 is about as long as broad ; the second and following bear a finely serrate transverse ridge which 

 becomes median in position after the fourth or fifth ; it is low and very narrow, appearing as 



SIBOGA-EXPEP1ÏIE XLII^. IÓ 



