179 



2. Perissometra selene (A. H. Clark). 



A. H. Clark. Proc. U.S. National Museum, vol. 39, 191 1, p. 556 {Pachylometra selene). 



3. Perissometra gorgonia sp. nov. 



Stat. 254. 5°40'S., I32°26'E. Arafura Sea. 310 Metres. 1 Ex. 

 Stat. 294. 10° 12'. 2 S., 124 27'. 3 E. Timor Sea. Ji Metres. 1 Ex. 



The centrodorsal is small, apparently conicaj, the cirrus sockets arranged in ten closely 

 crowded columns. 



The cirri are XXIV, 19 — 24 (usually 21), 25 mm. to 40111111. (usually 30 mm. to 35 mm.) 

 long; the segments are very uniform in length, the sixth or seventh and following being slightly 

 longer than broad ; the distal edges of the segments are slightly prominent, and the distal edges 

 of those in the outer half are slightly thickened 011 the dorsal side. The cirri are relatively 

 largfer and stouter than those of P. selene. 



The ends of the basal rays are visible as very large rhombic or rounded triangular low 

 tubercles or flat areas in the angles of the calyx. The radials are concealed. The IBrj are 

 extremely short, in the angles of the calyx running far upwards and meeting over the ends 

 of the basal rays; they bear a low broad median tubercle. The axillaries are rhombic, about 

 tvvo and one half times as broad as long; except in the median line their edges, like those 

 of the IBij, are slightly everted ; they bear a large low broad median tubercle. 



The 20 arms are about 170 mm. long; all ten of the IIBr series are 4 (3 +4); each 

 of the component ossicles carries a low rounded median tubercle, and has slightly thickened 

 edges all around. The earlier brachials have slightly thickened and more or less everted distal 

 edges, which as the brachials become triangular change to simple overlapping distal ends ; 

 traces of a low rounded median tubercle may be found at least as far as the end of the 

 proximal thircl of the arm. 



The specimen from Stat. 254 has 17 arms 130 mm. long; five of the IIBr series are 

 4 (3 + 4) and two are 2; the cirri are rather slender, XXV, 14 — 16, 16 mm. long. 



4. Perissometra patuia (P. H. Carpenter). 



P. H. Carpenter. "Challenger" Reports. Comatulae, 1SS8, p. 219, pi. 43 {Antedon patuia). 

 Bell. Journ. Linn. Soc. (Zool.), vol. 24, 1893, p. 341, {Antedon. patuia). 



A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1913, X' 15, p. 48 {Pachylo- 

 metra patuia). 



5. Perissometra robitsta (P. H. Carpenter). 



P. H. CARPENTER. "Challenger" Reports. Comatulae, 1888, p. 220, pi. 44, figs. 1 {Antedon 

 robusta). 



BELL. Journ. Linn. Soc. (Zool.), vol. 124, 1893, p. 341' {Antedon patuia, part). 



A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 191 3, X" 15, p. 49 Pachylo- 

 metra robusta). 



Stat. 297. io°39'S., I23°40 E. Timor Sea. 520 Metres. 2 Ex. 



One of the specimens has the cirri 55 mm. to 70 mm. long, composed of 28 — 31 



