280 APPENDIX. No. IX. 



reduplication of certain papillae in the vertical axis of the 

 Ophiuran. This seems to arise from the longitudinal 

 cleavage of pre-existing papillae. 



In young individuals the spinelets of the disk are pro- 

 portionally long, five or six times their own diameter, and 

 present all the appearances of ordinary embryonic spines. 

 During the process of growth, however, increase is made in 

 thickness only, so that when maturity is attained, and the 

 spinelets, along with the disk, are invested with the semi- 

 transparent leathery membrane of the body, the appearance 

 is more that of short stumpy prominences than of actual 

 spines a deception which at first sight gives a totally 

 different character to the Ophiurans. 



Astrophyton arcticum ( Leach), fide Smith. 



This Astrophyton was dredged off West Greenland by 

 Mr. A. C. Horner, who accompanied Sir Allen Young in the 

 ' Pandora,' at a depth of 600 fms. in Smith's Sound, lat. 

 78 19' K, long. 74 30' W. The present writers have not 

 seen this specimen, and are indebted for the information to 

 Mr. Edgar A. Smith, F.Z.S., of the British Museum, by 

 whom it has been determined and referred to Leach's species. 

 This is particularly interesting, as the original Gorgonoce- 

 phalus arcticus, Leach, was obtained by Sir John Eoss in 

 Baffin's Bay, lat. 73 37' N., long. 77 25' W., at a depth of 

 800 fms. This was one of the earliest instances of a living 

 organism being dredged from so great a depth. 



CRINOIDEA. 



Antedon Eschrichtii (Miiller) and Antedon celtica (Barrett). 



Coll. Feilden : Discovery Bay, 25 fms., bottom hard. 



The Comatulce were handed over to Dr. Carpenter for 

 determination ; and he has kindly informed us of the occur- 

 rence of the above-named species. 



Conclusions. 



It is clearly manifest that extreme caution should be 

 exercised in drawing conclusions as to the general character 



