558 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



Washington at station III, haul 5. The first syzygy he always found between brachials 

 3+4, and the second always between brachials 9 + 10. The third syzygy was usually 

 between brachials 14 + 15, but varied from between brachials 13 + 14 to between 

 brachials 16 + 17. The fourth syzygy was usually between brachials 17 + 18, but 

 sometimes between brachials 18 + 19, or even brachials 20+21 or 21+22. Of theouter 

 syzygies, he said that their position varies in different arms of the same individual 

 as well as in different individuals, and that 3, 4, 5 or 6 muscular articulations may 

 intervene between 2 succeeding syzygies, the numbers folio wing each other in a wholly 

 irregular manner. He noted ( and in all the arms of one individual) one or more series 

 of brachials made up of a syzygial pah- with a brachial having a muscular articulation 

 at each end; he says that this is a disposition which, with rare exceptions, is constant 

 in normal specimens of L. phalangium, and he found it also, though very rarely, in 

 Antedon mediterranea. 



At Marseille, Marion (1879) found P! and P 2 to vary from 12 to 17 mm. in length. 



In a specimen from La Ciotat, Grieg (1904) found P, to be 14 mm. long, with 34 

 segments (in 2 cases); P 2 13 mm. long with 30 to 33 segments; and P 3 4.0 to 4.5 mm. 

 long, with 13 to 15 segments. 



Carpenter (1888) says that he occasionally found P 3 to be almost as large as P 2 . 



Ludwig noticed (1880) that in each ambulacral lappet there is a delicate perforated 

 plate averaging 0.13 mm. in length, and in the wall of the basal portion of the tentacles 

 there are small calcareous rods beset with minute spinelets which are at the most 0.07 

 mm. long. Grieg (1904) found that over the first 5 or 6 pinnule segments there are no 

 adambulacral deposits. Beyond this point these take the form of large irregular 

 perforated plates which alternate with the sacculi, recalling the plates in Heliometra 

 glacialis, from which they differ in being single and not in contact with each other. 

 Carpenter remarked (1888) that the pinnule ambulacra are sometimes imperfectly 

 protected by small and delicate plates. He found such plates in specimens from Tunis; 

 but in others from Marseille these were reduced to small Y-shaped rods. 



Grieg (1904) described the pinnule segments as long and slender, about 4 times as 

 long as broad, without spines on the dorsal side; even the outermost segments, including 

 their distal ends, are without spines. 



[NOTES BY A.M.C.] In nine of Carpenter's Porcupine specimens from off Tunisia 

 the centrodorsal varies in size from 1.3 to 3.2 mm. basal diameter and 1.2 to 3.1 mm. 

 vertical height, the ratio of diameter to height being from 1 : 0.50 to 1 : 1.15 averaging 

 1 : 0.86. The small specimens particularly have the centrodorsal sharply conical. 

 The one in which the height is only half the diameter is large and has the centrodorsal 

 very broadly truncated, the basal diameter being 3.0 mm. The longer proximal cirrus 

 segments are usually almost cylindrical but in a few specimens may be notably con- 

 stricted in the middle (see fig. 32,a, p. 567). The segments at about two-thirds of the 

 length of the cirrus may have very slight dorsal processes but these are not as prominent 

 as in celtica. The distal cirrus segments are always very long and there is no trace of an 

 opposing spine on the penultimate. The terminal is barely, if at all, curved. 



Localities. Porcupine, 1870; off Cartagena, Spain; 146 meters [P. H. Carpenter, 

 1884, 1886; von Graff, 1887; A. H. Clark, 1913] (3, B.M.). 



Blanes (north of Barcelona) [Aranda y Millan, 1908]. 



Balearic Islands [Aranda y MiJlan, 1908]. 



Xauen station 7; off Majorca Gat. 3911'10" N., long. 91'35" E.); 133 meters 

 [Rivera, 1934; Buen, 1934]. 



