ECHINODERMS COLLECTED KY THE "HUXLEY," AUGUST, 1906. 533 



increase in number. Generally, however, indications of the primary 

 arrangement may be traced. 



The arm combs have a variable number of spines. In some specimens 

 there were twelve on each side. On each side of the notch there are a 

 variable number of small spinules, sometimes six on each side ; and in 

 the centre of the notch a small cluster. There may be a variable 

 number of spines on the first upper arm-plate. Occasionally there is 

 a complete row on each side of the arm-plate, which in continuation 

 with those on the sides and centre of the notch form a complete curve 

 of spinules. The arrangement is very variable, but the notch and 

 arm-plate never appear to be quite destitute of spines. 



In the Huxley collection, and other spirit-preserved specimens 

 examined, the arms are banded at regular intervals with a darker 

 shade. 



Ophioconis Forbesi (Heller). 



Station V. 109 fathoms. 1 specimen. 



The disc is rather distorted, but the diameter would be about 6 mm. 



Ophioconis Forbesi is described as Pectinura Forhesi by Heller in 

 Untcrsuchungcn i'lbcr die Litoralfauna des adriatischen Meercs. Kaiscr- 

 lischen Alrid. dcr Wissenschciftcn. 1862. Vol. XLVI, p. 423. PI. II, 

 Figs. 5-8. 



See also Liitken, Additamenta ad historiam Ophiuridarum, Part III, 

 p. 98. 1869. 



AMPHIURIDJE. 



Amphiura elegans (Leach). 



Station I. 75 fathoms. 5 specimens. 

 Station V. 109 fathoms. 6 specimens. 



Ophiactis Balli (Thompson). 



Station I. 75 fathoms. 1 specimen. 



Station VII. ttt fathoms. 4 specimens. 

 Station XIII. 412 fathoms. 6 specimens. 



Ophiactis abyssicola (Sars). 



Amjjhiura abyssicola. Sars. Norg. Ech. (1361), p. 18. PI. II, Figs. 

 7-12. 



Ophiocnida abyssicola. Lyman. ///. Cat. Mus. C.Z., I. 1865, 

 p. 12. 



Ophiactis abyssicola. Bell. Brit. Mus. Cat. Echinoderms, p. 123. 



