A MONOGRAPH OF THE EXISTING CRINOIDS 429 



Carpenter noted that tuberculoid has many points of resemblance with spicata 

 from the Banda Sea (see beyond), and it may be that a larger knowledge of both types 

 will eventually lead to their union He said that in tuberculata the cirri are both 

 considerably more numerous than in spicata and reach a larger size, though the actual 

 number of segments composing them is the same in both forms. The IBn of tuber- 

 culata are short as compared with the axillaries, not reaching half their length, while 

 in spicata the axillaries are short as compared with the IBr,. In spicata the arms are 

 also longer than in tuberculata, and the muscle plates are more prominent at the sides 

 of the ambulacra. 



Of the two specimens from Lifu one has 30 arms 120 mm. long, and the cirri 

 LII, 25-28 (usually 25), 20 to 30 mm. long. P 2 has 15 segments, and P 3 has 11 or 12 

 segments. The other is similar. 



In the specimen from New Caledonia the cirri are XVI, 18-19. There are 24 

 arms. P 2 is much enlarged and very stiff and spinelike. P 3 resembles P 2 but is 

 slightly smaller. P 4 and the pinnules following are short but stiffened. 



The specimen from Mer was described by Dr. Hubert Lyman Clark as a new 

 species under the name of Stephanometra stypacantha. He said that the centrodorsal 

 is large, thick, slightly convex, and almost completely covered by the cirri. Its 

 diameter is 3.5 mm., but the bare dorsal pole is less than 1 mm. across. The cirri 

 are XXXIII, 18, about 12 to 13 mm. long, and are distally very distinctly compressed. 

 The basal three or four and the terminal half dozen segments are more or less shortened, 

 and the others are longer than broad. The terminal six or seven segments may show 

 a longitudinal keel dorsally, but this is never marked. The opposing spine is distinct 

 but small. The division series are all 2. The axillaries are pentagonal, nearly as long 

 as broad. The division series have no lateral processes, and no synarthrial tubercles. 

 The 16 arms are about 70 mm. long. At the base of the arm and distally the brachials 

 are quadrate, but the seventh-thirtieth (or thereabouts) are more or less markedly 

 wedge-shaped. Syzygies occur between brachials 3+4 and 16 + 17 and then at 

 intervals of seven to nine muscular articulations. Sometimes they occur between 

 brachials 9 + 10 and 14 + 15 (or 15+16) and then at intervals of six or seven muscular 

 articulations. 



P[ is about 4 mm. long, flagellate, with 14 segments, of which the bis°l are stout, 

 but the distal are long and very slender. P a is similar but much smaller. P 2 is very 

 rigid, sharp, and spinelike, 8 mm. long, with 9 segments, of which 3 to 6 are greatly 

 elongated, three times or more as long as broad, and the ninth is minute. P b is similar 

 but is evidently smaller in every way. P 3 is similar to P 2 but is only 5 or 6 mm. long. 

 P c is similar but much smaller. P 4 is more flagellate, less than 3 mm. lonp - , and with 

 only 8 segments. P d is similar, and about equal, to P 4 . The succeeding pinnules 

 gradual'y become longer but do not exceed 6 or 7 mm., with 14 or 15 segments. All 

 the pinnules are more or less cylindrical and are composed of smooth segments. 



Dr. Clark said that this species seems to be very well characterized by the numer- 

 ous, few-jointed, nearly smooth cirri, the absence of ventrolateral processes on the 

 arms, and the small number of segments in P 2 ; the form and proportions of the lower 

 pinnules also seem to be characteristic. 



According to Carpenter the type specimen from the Banda Sea has the centro- 

 dorsal thick and discoidal with a small slightly hollowed dorsal pole and very sloping 



