A MONOGRAPH OF THE EXISTING CRINOIDS 137 



more scattered. This is the case in a specimen of pulcheUa from Blake station 32Ag. 

 In this the warts are not entirely calcified, containing only small calcareous spicules. 



The form of these processes on the disk may be, instead of wart-like, papillose or 

 even villous. There are few or none of these in the variety planata. 



In color, as preserved in alcohol, 2 specimens of piilchella from Blake station 158 

 are violet. Some from Blake station 45Ag. and from between Martinique and 

 Dominica in 292-695 meters are uniform dark brown. Many specimens of pulchella 

 are pure white, and all the specimens of the variety planata are uniform brownish 

 white. 



Very characteristic of this species is the common occurrence of dark cross bands 

 on the arms which are usually confined to the syzygial pairs, but which sometimes 

 extend over all the brachials between 2 syzygies. Sometimes the proximal portion 

 of the animal as far as the third brachial is dark brown, contrasting sharply with the 

 lighter arms and the very light cirri. 



In most specimens of the variety alata and in many of pulchella the arms carry 

 dorsal longitudinal stripes. 



In size, pulchella, according to Hartlaub, reaches an arm length of 150 mm. 

 He believes that alata scarcely reaches so large a size. The variety planata is much 

 smaller, the arms not exceeding 60 mm. in length. 



Abnormal specimens. — Dr. P. H. Carpenter {Challenger Report, 1888, p. 27; 

 cited by Bather, 1889, and Bateson, 1894) mentioned "a 6-rayed form" of this species, 

 of which he says : 



The disc is unfortunately concealed, so that the symmetry of the ambulacra cannot be made 

 out. But I am rather inclined to think from the appearance of the centro-dorsal that it has the 

 usual pentamerous symmetry, one of the radials being rather larger than its fellows and also axillary^ 

 so that it bears two small rays, as sometimes happens in Allagecrinus. 



Hartlaub says that he did not find this specimen; but it was in the material 

 returned by him; it is among the 5 specimens from Blake station 156 included in 

 M. C. Z., 483. 



One of the radials is slightly enlarged and axillary, and is followed by 2 IBr 

 series with, as usual, 2 elements each. 



In a 10-armed specimen from Blake station 45Ag. one of the IBr axUlaries bears 

 2 arms, in both of which the first 2 brachials are united by syzj^gy. The arm on the 

 right has the next syzygy between brachials 3 + 4, while that on the left has the next 

 syzygy between brachials 16 + 17. A still more extraordinary feature is that the IBr 

 axillary bears 2 pinnules, one on either side. Hartlaub suggests that we must assume 

 a fusion between the IBr axillary and the first 2 brachials on each arm. 



In the best preserved specimen from Blake station 45Ag. there are on one arm 

 syzygies between brachials 2 + 3 and 4 + 5. The first pinnule is on the outer side of the 

 epizygal of the first syzygial pair. The first brachial is very long, longer than either 

 syzygial pair, and Hartlaub suggests that it represents 2 brachials which are fused into 

 one. 



