568 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



also described specimens from the Minch with the later cirrus segments distinctly 

 broader than long. 



Of the 2 specimens from the Brazilian cable near Madeira in 914 to 1279 meters, 

 one was described by Carpenter as fairly normal in its characters with relatively 

 narrow rounded rays, which stand out well from the calyx; but in the other the rays 

 are closely appressed and the sides of the IBr series and of the first 2 brachials are 

 laterally flattened, while the distal edges of the brachials and pinnulars are fringed 

 with rather large spines. Carpenter remarks that he has noticed lateral flattening of 

 the rays in other examples from shallow water, but that he never saw it so marked 

 as in this example. I found a similar condition in a specimen dredged by the Flying Fox 

 in 457 meters off southwestern Ireland. Carpenter never saw any other individual 

 with spines on the brachials and pinnulars, and none has ever come to my notice. 



In the 4 specimens taken by the Porcupine off Cape Mondego in 402 meters which 

 I have examined, the arms are 70+ mm. long, and the cirri are from 40 to 45 mm. 

 long, with 42 to 48 (usually 43 or 44) segments. 



In the individual from the Sound of Skye in 46 to 73 meters the arms are 125 mm. 

 long and the cirri are 40 mm. long, with 47 segments, of which those in the outer half 

 are very slightly longer than broad, becoming slightly longer again terminally. 



In the 4 examples taken off Cape Sagres in 82 meters which I have seen, the longest 

 cirrus had 49 segments. [NOTE BY A.M.C.] In the Skagerak specimens from the 

 vicinity of Tangier, Gislen (1947) writes that the cirri are XXIII-XXX; 33^6 and 

 20-42 mm. long. The distal joints are scalloped and a third again as long as broad. 

 The arms are 60 to 80 mm. long. The pinnules of the largest specimen are as follows : PI 

 with 27 segments; 11 mm. long, the proximal 5 or 6 segments broader than long, the 

 distal segments becoming 2 or 3 times as long as broad. P 2 29; 11 mm. P 3 23; 8.5 mm. 

 P 4 15; 5 mm. P 6 13; 4. 5 mm. 



The British Museum specimens exhibit a great range of variation in the shape of 

 the centrodorsal and arrangement of the cirrus segments. In 10 specimens from west 

 of Ireland the centrodorsal is always conical, 2.1 to 2.8 mm. in basal diameter and 1.7 to 

 2.7 mm. high. The ratio of diameter to height varies from 1 : 0.76 to 1 : 1.09, averaging 

 1 : 0.95. In some of the specimens the obsolete apical cirrus sockets are overgrown by 

 large, usually blunt, papillae. In 10 specimens from the Minch (west of Scotland) the 

 centrodorsal is conical in only two, the other eight having it more or less truncated, 

 in the most extreme cases the diameter of the completely flat dorsal pole being about 

 0.7 of the basal diameter. The ratio of the diameter to height in these 10 specimens 

 varies from 1:0.49 to 1:1.0, averaging 1:0.67. 



The cirrus sockets may be arranged in regular columns but frequently this is 

 obscured in larger specimens. 



As for the cirrus segments, in some specimens these approach those of L. pha- 

 langium in form with the distal segments distinctly longer than wide and tapering in 

 shape, but usually the distal segments are more or less abbreviated and the penulti- 

 mate juts out slightly at its distal dorsal end, rarely bearing a small spine. The longer 

 proximal segments may be constricted centrally in some specimens as also in L. pha- 

 langium. 



Unfortunately, so few of the British Museum specimens have both arms and pe- 

 ripheral cirri anything like complete that no worthwhile comparisonof their proportions 

 with those of phalangium can be drawn up. 



