BATHYMETRINAE 



173 



The cirrus sockets are closely set in two rows around the periphery, the sockets of one 

 row in line with those of the other, i.e. they are arranged in columns of two. 



Cirri ca. XXX, 14-17. The cirri of the ventral row are a little longer, ca. 6 mm., and 

 usually of one or two more segments than those of the dorsal row, ca. 5 mm. The first 

 segment is very short, the second about as long as broad; the remainder are longer than 

 broad, the distal only slightly so (Fig. 12 a). The third to the fifth are the longest; they 

 are slightly constricted in the middle, a little more strongly on the dorsal than the ventral 

 side. The distal edge of the second to the fourth or fifth segment is produced into a 



Fig. 12. Phrixometra rayneri. a, cirrus, x 20. b, proximal part of ray, x 27. c, fourth to tenth brachials, 



X 27. </, distal brachials, x 20. f, P5, x 13. 



strong thorny flare around the base of the next ; the outer segments have their distal 

 edges flared only on the dorsal side, and to a less extent and the flare is not thorny. There 

 are no dorsal spines. The segments beyond the sixth or seventh are wider distally than 

 at the base and they are conspicuously wider and heavier than the proximal segments. 

 The terminal claw is short. The opposing spine is at right angles to the penultimate 

 segment ; its short distal edge is convex, its longer proximal edge concave. The cirri are 

 very similar in general appearance to those of P. nutrix. 



The radials, having concave distal edges, are fairly short in the mid-line but long inter- 

 radially (Fig. 12 b). The costals are considerably longer than the radials, deeply incised 

 by the axillaries; their lateral edges are rounded, not in apposition. The axillaries are 

 about as long as broad, their distal edges strongly concave ; the lateral corners are finely 

 thorny. 



The first brachials are deeply incised by the second ; their inner edges are much shorter 

 than the outer. The distal edges of all the brachials beyond the first syzygy are raised 



