PHYLL ACANTHUS ANNULIFERA. 15 



the stalk on which they are borne is even less. These pedicel lariae are 

 abundant everywhere among the numerous miliary spines so characteristic 

 of this species. 



Station 4050. Off Kealakekua Light, W. coast of Hawaii. 14-215 

 fathoms. Frag. cor. r. Two specimens. 



Phyllacanthus Brandt. 

 Phyllacanthus annulifera A. Ag. 



Cidarites annulifera Lamarck, 1816. Anim. s. Vert. Ill, p. 57. 



Phyllacanthua annulifera A. Ag. 1872. Rev. Ech. Pt. I, p. 150. de Loriol's Trois Esp. 



Ech. PI. IV. 



Plate 12^ figs. 14, 15. 



It has seemed worth while to figure the actinal primary spines of this 

 species to show the contrast between them and those of Stejjhanocidaris 

 bispinosa, with which this species appears to have often been confused. 



Phyllacanthus baculosa A. Ag. 



Cidarites baculosa Lamarck, 1816. Anim. s. Vert. Ill, p. 55. 

 Phyllacanthus baculosa A. Ag. 1872. Rev. Ech. Pt. I, p. 150. PL I/, 4-5. 



Plate 12^ figs. 16, 17. 



The actinal primary spines of this species are also figured to emphasize 

 the contrast between Stephanocidaris and Phyllacanthus in this particular. 



Phyllacanthus Thomasii A. Ag. and Clark. 

 Plates 5, figs. 1-17; 26, figs. 5-8; 27-30. 



The specimens collected of this species vary in size from 70 mm. to 

 30 mm. in diameter. In a specimen of 70 mm., with nine and nine primary 

 interambulacral tubercles (Pis. 27-30), the abactinal system measures 

 33 mm., the anal system 18 mm., and the actinal 26 mm. in diameter. 

 The longest primary radiole is 101 mm. 



In a specimen 40 mm. in diameter (PI. 26, figs. 5-8), with six and seven 

 primary interambulacral tubercles, the abactinal system measures 20 mm., 

 the anal 11 mm., and the actinal 20 mm. in diameter, and the longest 

 primary radioles, 70 mm. 



