726 A. T. MASTERMAN, 



membrane and a cuticle. There is little doubt that the in- 

 tracellular bodies under discussion arise in the young form 

 in close contact with this limiting membrane, but it is 

 possible that they do not actually arise from it. I am still of 

 the opinion that fine brown pigment granules are scattered 

 throughout the cells (Mcintosh [6] previously remarked upon 

 the " deep yellowish tint ^' of this region) ; and I still believe 

 that the inner end of each cell " tapers to a fibre-like thread, 

 which I believe to have in some cases traced into the main 

 nerve of the plume" (7, p. 344). Indeed, it is rather difficult 

 to understand otherwise in what region the very evident nerve 

 down each plume terminates. None of these features are 

 opposed to the " battery " function as suggested by Cole, 

 though I have not as yet seen the rhabdites, Avhicli appear to 

 require special staining. If their presence is corroborated 

 it would form by no means the least interesting feature of 

 Cephalodiscus. Cole, as a critic of the work of his prede- 

 cessors, might perhaps make a somewhat more sharp distinc- 

 tion between a tentative suggestion and a definite statement 

 of fact ; but leaving this apart we may regard his work as 

 confirming Mcintosh's previous interpretation of the bulbous 

 endings as masses of unicellular glands, the glandular se- 

 cretion being extended to the exterior through the surface 

 of the cells. Further, there is every reason to believe that, 

 according to Cole, some at least of the glandular masses 

 break up into rods. 



LiTEEATDKE. 



1. Cole, F. J. 'Journ. Liiinean Soc.,' vol. xxvii, No. 175. 



2. EiiLERs. 'Abli. k. Gcsellscii. AVissciiscli. Gotlingcii,' Bci.xxxvi (1890). 



3. IIakmeii, S. F. — Appendix to " Cliallciigcr " Report, vol. xx. 



4. ,, ' Zoo). Aiizeiger,' No, 545. 



5. Lang, A. — * Jenaisclic Zeitsclirift,' xxv (1800). 



6. McIntosh, W. C. — "Oil Cephalodiscus dodecaloplius," '"Chal- 



lenger" Report,' vol. xx. 



