364 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



ceded by usually four unmodified segments so that it appears pedunculated ; and there 

 is no carination of the IBr series and arms. 



Description. The centrodorsal is very low, low-hemispherical or almost discoidal, 

 from 1.5 to 2.0 mm. in diameter. The cirrus sockets are arranged in one and a partial 

 second irregular and closely crowded rows. 



The cirri are XVII, 11-12 (usually 11), from 8 to 11 mm. long, slender, with 

 elongated segments. The first segment is very short, dorsally expanded into a rounded 

 knoblike process; the second is not quite so long as broad; the third is twice as long as 

 the median width; the fourth and fifth are nearly three times as long as the median 

 width; and the remainder are very slightly shorter, becoming a trifle longer again, 

 about two and one-half times as long as broad, on the antepenultimate and penultimate. 

 The penultimate segment is of lesser width in lateral view than those preceding. The 

 third and following segments are moderately constricted centrally with prominent distal 

 ends, this feature decreasing distally. The segments bear no dorsal spines or other 

 prominences. The opposing spine is prominent, terminal, directed obliquely forward; 

 its proximal profile is convex, its distal profile concave, and its base occupies only 

 slightly more than one-third of the dorsal surface of the penultimate segment. The 

 terminal claw is about as long as the penultimate segment and is moderately stout and 

 moderately and evenly curved. 



The ends of the basal rays are visible as small but prominent tubercles in the angles 

 of the calyx. 



The radials are entirely concealed by the centrodorsal. The IBr, are short, about 

 four times as broad as long in the median line; the proximal border is slightly produced, 

 slightly convex, but usually becoming straight in the lateral quarters; the lateral edges 

 are in close apposition with those of their neighbors, and are widely divergent and 

 produced and everted as in Glyptometra lateralis; the distal edge is sometimes obscurely 

 scalloped in the lateral thirds, the median third being slightly excavated for the recep- 

 tion of a rounded posterior process from the axillary. The IBr 2 (axillary) is exceedingly 

 short, about two and one-half times as broad as long; its lateral edges resemble those 

 of the IBri but are only about half as long. 



The 10 arms are about 40 mm. long. The first brachials are in close apposition 

 with their neighbors both internally and externally; their proximal and distal borders 

 are parallel, the proximal being slightly everted; their outer borders are produced and 

 everted like the outer borders of the preceding ossicles; the inner borders are similarly 

 everted, though not so much so; the synarthrial tubercles, though small and well 

 rounded, are rather prominent. The second brachials are similar to the first, but are 

 about twice as long externally as internally. The first syzygial pair (composed of 

 brachials 3+4) is roughly oblong, about two and one-half tunes as broad as long, with 

 the lateral edges modified as in the ossicles preceding. The next three brachials are 

 wedge-shaped, about twice as broad as the maximum length, with the dorsal surface 

 usually concave and the distal edge therefore prominent. After the tenth the brachials 

 become triangular and about as long as broad, later very obliquely wedge-shaped, and 

 toward the ends of the arms twice as long as broad. Beyond the second syzygy the 

 brachials have slightly produced and very finely spinous distal ends. There is no 

 carination of the division series and arms. 



