A MONOGRAPH OF THE EXISTING CRINOIDS 551 



P 2 is 7.5 to 9.5 mm. long and composed of 25 segments. P 3 is 9.0 to 11.5 mm. long, 

 with 21 segments. P 4 is 6.0 to 6.5 mm. long, with 16 segments. The color is whitish 

 with broad, frequent, and regular bands of purple on the arms, which become more 

 closely crowded distally so that the outer portion of the arms is purple with narrow 

 white bands. 



The specimen from Siboga station 213 (Saleyer) is large, with 40 arms about 100 

 mm. long. The cirri are XXII, 29-30, 27 mm. long. It agrees very well with the 

 type specimen hi the Leyden Museum. 



The specimen from Siboga station 144 has 18 arms 90 mm. long. The longest 

 cirri are 16 mm. long and are composed of 22-24 segments, of which the ninth or tenth 

 and following bear dorsal spines. 



The specimen from Siboga station 43 has the cirri XXI, 27-28, from 20 to 21 mm. 

 long. The longest segments are about one-third again as long as broad. The short 

 distal segments are only slightly broader than long. Dorsal spines, which are some- 

 what smaller than in specimens at hand from Singapore, are developed from the eighth 

 or ninth segment onward. The 14 arms are 115 mm. long. Only one IIIBr series 

 is present, developed externally. P! is 8 mm. long, with 28 segments. P 2 is 11.5 mm. 

 long, with 27 segments. P 3 is 15 to 17.5 mm. long, with 30-38 segments. P 4 is 9 

 mm. long, with 20 segments on arms arising from a IIBr axillary, and 12.5 mm. long 

 with 27 segments on arms arising from a IIIBr axillary. In the latter case it re- 

 sembles P 3 . The color is deep purple. 



Dr. Clemens Hartlaub redescribed Antedon flagellata on the basis of three speci- 

 mens from Singapore, two collected by Jagor in the Berlin Museum and one collected 

 by von Martens in the Gottingen Museum. The centrodorsal is large and thick with 

 swollen sides and a deeply concave bare dorsal pole. The cirri are arranged in two 

 or three irregular rows. The cirri are about XXX-XXXV, 25-30, the longest 25 

 mm. long. The sixth and four following segments are slightly longer than broad; 

 those succeeding are shorter, practically all of them of equal size, and bear small 

 distally directed spines that usually arise from a long base involving the distal half 

 of the segment. The radials are visible in the interradial angles of the calyx. The 

 IBri are broad and short, and are more or less completely united with their neighbors. 

 The IBr 2 (axillaries) are short, and are broadly pentagonal or almost triangular. 

 The postradial series are free laterally or in lateral contact. They divide three times, 

 so that as a rule each postradial series bears eight arms. All the division series are 2. 

 Moderately strong synarthrial tubercles are present. There is no thickening of the 

 outer sides of the postradial series. There are 40, or almost 40, arms about 90 mm. 

 long with a smooth dorsal surface and composed of short brachials. The first brachials 

 are rhombic, or almost rhombic, and are entirely united interiorly. The second 

 brachials are shorter than the first, and are a little longer exteriorly than interiorly. 

 The first syzygial pair (composed of brachials 3+4) is squarish. The next five or six 

 brachials are short and discoidal, those succeeding triangular, later bluntly wedge- 

 shaped, and finally more squarish. The four or five lowest brachials have as a rule 

 somewhat flattened outer sides. The first syzygy is between brachials 3+4, the second 

 is from between brachials 17+18 to between brachials 23 + 24, and the distal inter- 

 syzygial interval is usually 12-14 muscular articulations. 



