A MONOGRAPH OF THE EXISTING CRINOIDS 



123 



Koehler said that the specimens collected by the Princesse-Alice were in general 

 incomplete, and in many of them the arms were broken off at the first syzygy so that 

 the number of arms may have been greater than that given. He noted that Carpenter, 

 who had carefully studied this species, directed attention to the variability in the 

 number of arms. The normal number appears to be 10, though it may be more, in 

 which case the IIBr series are 2, or sometimes 4(3 + 4). He remarked that Carpenter 

 cited the case of an individual collected by the Challenger (in reality the Porcupine) 

 with two IIBr 2 series and at least 12 arms, and in a paper published in 1891 Carpenter 

 recorded an individual with at least 14 arms and with both IIBr 2 and IIBr 4(3+4) 

 series. 



Koehler said that the first syzygy is between brachials 3 + 4 and the second usually 

 between brachials 13+14; those following occur at intervals of 4 or 5 muscular artic- 

 ulations. 



Carpenter said that Mr. Johnson's specimens from near Madeira are larger than 

 those obtained by the Porcupine, one of the cirri having 56 segments. One individual 

 may have had only 10 arms. A second had 11 and perhaps more, but most of them are 

 broken at the base, only one IIBr 2 series being left. The third had 14 or more arms, 

 there being one IIBr 2 series and three IIBr 4(3+4) series remaining; of the six arms 

 following the three IIBr 4(3+4) series three have the first syzygy between brachials 

 1+2, and in the other three there is a syzygy between brachials 2 + 3. 



Nearly all the 10 specimens dredged by the Porcupine had the arms broken off at 

 the first syzygy, and Carpenter said it was therefore quite possible that the epizygal 

 of this syzygial pair might sometimes have been a IIBr axillary. He noted that in one 

 specimen there are two IIBr 2 series. 



Localities. Princesse-Alice station 1713; off Tenerife, Canary Islands (lat. 2804' 

 N., long. 1649'30" W.); 1,330-1,340 meters; August 1, 1904 [Koehler, 1909; A. H. 

 Clark, 1911, 1923; Mortensen, 1927]. 



Princesse-Alice station 1116; off Cape Ghir (Ras Aferni), Morocco (lat. 3143'30" 

 N., long. 1046'45" W.); 2,165 meters; globigerina ooze; July 11, 1901 [Koehler, 1909; 

 A. H. Clark, 1911, 1923; Mortensen, 1927]. 



Princesse-Alice station 2048; off Funchal, Madeira (lat. 3232'30" N., long. 1702' 

 W.); 1,968 meters; July 31, 1905 [Koehler, 1909; A.H.Clark, 1911, 1923; Mortensen, 

 1927]. 



Princesse-Alice station 1236; off Funchal, Madeira (lat. 3234' N., long. 1702'45" 

 W.); 1,500 meters; September 8, 1901 [Koehler, 1909; A. H. Clark, 1911, 1923; Mor- 

 tensen, 1927]. 



Princesse-Alice station 806; off Machico, Madeira (lat. 3239'20" N.,long. 1640'55" 

 W.); 1,425 meters; July 4, 1897 [Koehler, 1909; A. H. Clark, 1911, 1923; Mortensen, 

 1927]. 



In the neighborhood of Madeira, from a submarine cable belonging to the Brazilian 

 Submarine Telegraph Co.; 914-1,280 meters; J. Y. Johnson [P. H. Carpenter, 1891; 

 Hartlaub, 1895; Koehler, 1909 (as "cdtes du Brazil"); A. H. Clark, 1911, 1923; 

 Mortensen, 1927]. 



Talisman; west of Cape Blanco, Morocco (lat. 3317' N., long. 1123' W.); 1,635 

 meters; June 14, 1883 [Parfait, 1884; Koehler and Vaney, 1910; A. H. Clark, 1911, 

 1923; Mortensen, 1927]. 



