Clark — A Revision of Thalassometridx and Himerometridas. 19 



Cirri xv-xxx, 13-21, smootli and stont, al)(jut one-sixth of the arm 

 length ; first few joints short, the remainder siibequal, shghtly longer than 

 wide, to half again as long as wide; distal joints with a slight prominence 

 of the median part of the distal dorsal edge; opposing spine small, or 

 reduced to a tubercle, terminally situated; terminal claw about as long as 

 the penultimate joint, stout and moderately curved. 



Disk more or less completely plated ; brachial and pinnule ambulacra 

 well plated. 



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

 radials, and often more or less of the i Br,, concealed; r Br,, when visible, 

 very short and band-like; i Br., very broad, rhombic, three times as 

 broad as long; i Br and lower brachials in very close lateral apposition, 

 and very sharply flattened, the dorso-lateral edge being everted and more 

 or less profjuced into a thin flange-like border, which may persist as far 

 as the sixteenth brachial. Tlie i Br series and lower brachials have a 

 rounded median dorsal tubercle or blunt keel, the remainder of the dorsal 

 surface of the joints being coarsely and irregularly rugose or covered with 

 moderately large tubercles ; the edges of the joints, especially the i Br 

 series and first two brachials, are usually more or less, sometimes very 

 strongly, crenulate. 



Arms 10 (one record of 11, ii Br 2), the brachials after the fourth obliquely 

 wedge-shaped, much broader than long, soon becoming triangular, about 

 as long as broad ; distal ends of Vjrachials slightly prominent. 



P, longer than l\, slender, becoming flagellate distally, composed of 

 twenty to forty short joints ; Pa not quite so long with fewer joints, of 

 which the basal eight or nine are somewhat expanded laterally ; following 

 pinmiles at first slightly shorter, then slowly increasing in length ; basal 

 two-thirds of the earlier pinnules much expanded, this expansion tapering 

 gradually away distally so that the end of the pinnule is flagellate ; this 

 exi^ansion occupies progressively less and less of the pinnule distally, and 

 finally disajipears. The distal pinnules are as 'long as, or slightly longer 

 than, P,. 



Color (in life). — Yellow, large specimens becoming brown. 



Distribution. — Philippine Islands northward and northeastward to south- 

 ern Japan and the Hawaiian Islands. 



Depth. — 319 to 451 fathoms. 



Included species : 



Glyptometra lata (A. H. Clark) Glyptometra lateralis (A. H. Clark) 



Glyptometra tuberosa (P. II. Carpenter). 



20. Strotometra gen. nov. 

 Genotype. — Aatedon hepburniana A. H. Clark, 1907. 



Centro-dorsal low-hemispherical or discoidal, with a rather large 

 roughened dorsal pole; cirrus sockets marginal, in a single row. 



Cirri x-xv, 1Qf-1o, short and stout, one-seventh to one-sixth of the arm 

 length, the component joints (except the basal two) subequal, squarish, 

 or slightly longer than wide; no dorsal spines; opposing spine very small, 

 terminally situated. 



