A MONOGRAPH OF THE EXISTING CRINOIDS 365 



fine large specimen, typical of the species, with the usual type of small weak cirri. 

 There is a prominent very narrow median carination running the entire length of the 

 arms and also occurring on the elements of the IBr series. The anterior arms are 

 slender and elongate, the posterior being scarcely more than half as long and some- 

 what swollen in the proximal half. Four of the arms have no ambulacral grooves at 

 all, and in the other 6 only the distal pinnules are supplied with them. The cirri 

 are IX, 12, 7 mm. long. The color is light yellow brown. A second specimen has 

 the anterior arms 135 mm. long and the posterior arms 70 mm. long. Two of the 

 arms are ungrooved, and the genital pinnules on the others lack grooves. The cirri 

 are IV, 10-12, 7 mm. long. The color is light yellow brown. The third specimen 

 has the anterior arms 110 mm. long and the posterior arms 80 mm. long. The arms 

 have the same mediodorsal carination as in the other specimens. Three arms are 

 wholly ungrooved, one has a partially obliterated ambulacral groove, while on the 

 anterior arms all the pinnules beyond the fifth or sixth pair are grooved. The cirri 

 are VII, 10-11, from 5 mm. to 7 mm. long. 



Of the specimens from the Hamburg southwest Australia expedition station 14, 

 one has the anterior arms 125 mm. long and the posterior arms 70 mm. in length. 

 The cirri are VII, 12-14, from 10 mm. to 12 mm. in length; they are arranged in 2 

 pairs with 3 occurring singly. Four of the arms are ungrooved, and there are no 

 grooves on the genital pinnules of the others. A fine mediodorsal carination is present 

 on the ossicles of the IBr series and on the bracliials. A second specimen has the 

 anterior arms 130 mm. long and the posterior arms 95 mm. in length. Four entire 

 arms and the genital pinnules of the other 6 are ungrooved. The cirri are VII, as 

 in the other. The third specimen is similar to the first. 



One of the specimens from the Hamburg southwest Australia expedition sta- 

 tion 21 has the anterior arms 140 mm. and the posterior 80 mm. in length. The 

 usual fine dorsal carination is present. The posterior arms are slightly swollen, the 

 anterior being more slender. Three entire arms and the genital pinnules on all the 

 others are ungrooved. The cirri are small, IX, 11-12. The other specimen is 

 smaller, the anterior arms being 100 mm. long and the posterior 55 mm. The 

 posterior arms are slightly stouter than the anterior. The cirri are VIII, 11-13, 

 from 4 mm. to 7.5 mm. long. 



The specimen from the Hamburg southwest Australia expedition station 23 has 

 the anterior arms 70 mm. long. The cirri are IX, one being unpaired, and robust. 



The specimen from Turtle Island, Western Australia, has the arms 130 mm. in 

 length. There is a fine carination along the mediodorsal line of the IBr series and 

 the brachials. The cirri are X, 13, comparatively large, from 10 mm. to 11 mm. 

 long, and are arranged in 5 pairs. 



According to Gisle'n the specimens from near Cape Jaubert had the cirri VI-IX, 

 and the combs on P, consist of 10-15 teeth. Three of these specimens represent 

 typical purpurea. One from Mjoberg's station 2 has the cirri IX, 11-12 (young cirri 

 with 10 segments); the anterior arms are 40 mm. and the posterior 25 mm. in length. 

 Another from Mjoberg's station 12 is a typical purpurea with the cirri IV, 10-11. 

 The third typical purpurea is from Mjoberg's station 1 4 ; the cirri are IX, 9-1 1 . Four 

 other specimens are intermediate between purpurea and pectinata. One of these, 



