5. Crotalometra marginalis \ II Clark), 



\ II. Clark. Zool. Anzeiger, vol. 59, [912, N" 11 [2, p. 424 [Thalassometra marginalis). 

 Mid-channel between the Lucipara and Schildpad [slands. [595 Me tres. 2 Ex. 



One of the specimens lias 17 arms about 95 mm. long; two of the IIBr series are 2, 

 and five are 1 . the cirri are 50 mm. long with 60 segments; the other, of the same 



. lias [8 arms with all of the IIBr series 4(3 + 4). 



The individuals have about half the arm and cirrus length of C. rustüa, tho 

 apparently they represent a species very closely related to it. 



rhe ccntrodorsal is low, rounded conical; the cirrus sockets are arranged in columns 



of two each, the two columns in each radial area being in close contact with those of adjacent 



iorly but separated interiorly by a bare triangular area about half as wide as a 



cirrus socket which comes to a point just bevond the last functional socket and is continued 



thence as a narrow line to the dorsal pole. 



The proximal edge of the IBr, are produced into a narrow rim which projects over the 

 radials. entirely concealing them ; the ends of the basal rays are very prominent as high dorso- 

 ventrally elongate tubercles which are usually rather longer than the dorsoventral length of a 

 cirrus socket; in the interradial angles the IBr, are cut away to accomodate the basal rays, 

 whereas in C. rustten they are separated from the basal rays by the radials which form a 

 continuous band all around the calyx. In one specimen a small portion of the lateral edge of 

 the radials is visible as two elongate tubercles meeting in a triantrle over the ends of the 

 basal rays 



6. Crotalometra magnicirra (Bell). 



Bell. Marine Investigations in South Africa, vol. 3, 1905, p. 141 {Antedon magnicirra); 



p. 142 (Antedon magnicirrus) ; pi. 4 (Antedon magnicrinus). 

 \. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1913, X"i5, p. 45 (Crotalometra 



magnicirra . 



Oceanometra A. II. Clark. 



Key to the Species of the Genus Oceanometra. 



a' Not over 60 cirrus segments; keels 011 the division series and first two brachials 

 confined to the distal element of each pair (axillaries and IIBr, when not axil- 

 lary, and second brachials), being entirely absent from the proximal elements; 

 larj^e and very robust, th<- cirri exceptionally stout; 17 arms 1S0 mm. long; 

 cirri XXX, 55 — 60, 60 mm. to 80 mm. long Hawaiian Islands; 774 — 



858 Metres) gigantea 



; . cirrus segments; all the elements of the division series and both the 

 brachials of the first pair carry keels 



