648 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



short and band-like, of uniform height, strongly curved, the proximal 

 edge everted and dentate, and with a row of small pointed tubercles, 

 sometimes more or less confluent, midway between the anterior and 

 posterior borders; IBr^ (axillary) rhombic, twice and one-half as 

 broad as long, the anterior and posterior angles approximately equal, 

 the lateral edges about equal to those of the IBr^; IIBr 4 (3+4) (in 

 one specimen twice 2) ; IIIBr 2 (l-|-2), but only present in a single 

 instance, developed interiorly. The division series are in close 

 lateral apposition and are sharply flattened laterall}^; they are 

 strongly convex dorsally, so that the dorsal portion of Pd is exposed. 

 The division series and arms to the fourteenth or eighteenth brachial 

 are thickly covered with numerous uniform, small, sharp, conical 

 tubercles, which exhibit a tendency to arrange themselves in hori- 

 zontal rows; these are more numerous and more slender along the 

 edges of the division series. Seen without a glass, the proximal por- 

 tion of the animal has the appearance of being finely and evenly 

 granulated. 



Nineteen to twenty-one arms, 100 mm. to 125 mm. long, resembling, 

 except for the basal ornamentation as described, those of other 

 species of the genus. 



The pinnules are essentially as in the other species. 



Type-speeimen. — Cat. No. 25474, U.S.N.M. ; from Albatross station 

 No. 2330; off Havana, Cuba; 121 fathoms. 



Family ANTEDONID.E. 

 Genus PSATHYROMETRA A. H. Clark. 



PSATHYROMETRA MIRA, new species. 



Centro-dorsal conical, rounded at the apex, 4 mm. broad at the 

 base and 4 mm. high, divided into five radial areas by five shallow 

 interradial furrow^s, each equal in width to nearly or quite the diame- 

 ter of the adjacent cirrus sockets; cirrus sockets closely crowded, 

 regularly arranged in two converging columns in each radial area, 

 with a single socket, the remnant of a third column, between the 

 distal ends of the first sockets of the outer columns, which come to- 

 gether just beneath it. 



Cirri XL, lacking in both specimens. 



Ends of the basal rays visible as small tubercles in the angles of 

 the calyx, but with difficulty separable from the general surface of 

 the centro-dorsal and radials; radials even with the edge of the cen- 

 tro-dorsal in the median line, but extending up in the angles of the 

 calyx and entirely separating the bases of the IBr^; IBr^ oblong, 

 slightly over twice as broad as long, evenly rounded dorsally and 

 laterally; IBro (axillary) broadly pentagonal, about as long as 

 broad, the lateral edges not quite so long as those of IBr^, convex, 

 the lateral angles somewhat produced outward. 



