1898.] PLANKTON OF THE FAEEOE CHANKEL. 1029 



southernmost limit ^ for the occurrence of G. jMcJiy derma in hottom 

 deposits ; it is abundant in Arctic deposits, but has never been 

 recorded alive fi-om the surface. G. buUoides, on the other hand, 

 is ouly known to occur at the surface, although dead shells are 

 plentiful in the deposits of the Taeroe Channel. 



I venture to suggest that Dr. Carpenter's observation as to 

 the presence of very small living Glohigerince. just above the bottom 

 may be harmonized with the generally accepted view that most, if 

 not all, Glohigerince are essentially planktonic organisms, by the 

 supposition that G. jjochyderma is a meso]iliinktomc form, at any 

 rate in the Faeroe Channel. It is quite possible that it may occur 

 at the surface farther north, but it would escape capture by any 

 but the finest nets (diameter of the shell '3 mm., according to 

 Brady ; my largest specimens were about -15 to '2 mm.). 



SiLICOPLAGELLATA. 

 DiCIYOCHA Sp. 



A fair number of spicules referable to this genus of Ehrenberg 

 occurred in one or two surface-hauls, notably 13 7i. They agreed 

 on the whole with the spicules of D. stcqjedia and rhombus 

 (Haeckel), but no sign of the protoplasmic body was traceable. 

 Prof. Cleve ^ records D. fibula and D.speeidum (Ehrenberg) for the 

 same cruise. 



DlNOFLAGELLATA. 



In reporting on the A'egetable Plankton of the cruise of the 

 ' Kesearch ' in 1896, Prof. Cleve ^ records the following species of 

 Dinoflagellata : — 



Ceratium tripos Duj. 



Ceratium furca Duj. 



Ceratium tripos Ehrenb. ; var. haltica Schiitt ; var. macroceros 

 Ehrenb. = var. scotica Schiitt; var. longipes Bail. = var. tergestina 

 Schiitt ,• var. horrida Cleve. 



Peridinium divergens Ehrenb. 



Pyropliacus horologium Stein. 



With the exception of the last, with which I did not meet, all 

 these occur in all hauls with the finest net, many of them in great 

 abundance. 



ClXIATA OlIGOTRICHA. 



DiCTTOCTSTA ELEGANs Ehrenberg. 



A beautiful species of this genus was fairly plentiful in some 

 hauls, notably 13 7i. According to Moebius "^ all the various forms 

 of Dictyocysta are referable to Ehrenberg's species eJegans, an 



' H. B. Brady : Chall. Eep. Zool., is. Foraininifera, p. 600 (cf. pp xii-siv). 



^ ' Fifteenth Annual Eeport of Fishery Board for Scotland,' part iii. p. 302. 



^ P. T. Oleve : Fifteenth Annual Eeport of Fishery Board for Scotland, 

 1896, part iii. p. 297. 



■* O. Moebius : Fiinfter Jahresbericbt d. Commission z. \\iss. Untersuch. d. 

 deutschen Meere, 1887. 



