THE COLLOID EADIOLAEIA. 



133 



which region it is, in my experience, hy far the most commonly occurring of the colony- 

 forming Radiolaria, and it appears to be equally common in the Bay of Biscay. The 

 species described by Prof. Cleve as Trypanosph(sra Jjrachysiphon * from the Atlantic bore 

 such a strong resemblance to ChcenicosplKcra Murrayana that in 1902 f I suggested the 

 identity. I have latterly forwarded some specimens of the Biscayan species to Prof. Cleve 

 for comj)arison with his described species, and he has replied to me that they are the 

 same, and that his Trypanosphceya is really Clicenicosphcera Murrayana. The absence of 

 a tube-process round the pores of course removes the species from the former genus of 

 Haeckel. The elevated ridge bearing the short teeth round the pore is small, it and the 

 spines or teeth not being in height equal to more than half the diameter of tlie pore. 



In the Faeroe Channel examples I have been fortunate enough to observe the species 

 in the Isospore stage, but I do not find this stage in Dr. Fowler's specimens. 



NOTE TO THE EOREGOING. 



By G. Herbert Fowler. 



These Colloid Radiolarians are generally regarded as being distinctively surface forms, 

 but an analysis of the captures by no means bears out this idea. 



The table gives, for each depth, the percentage of the hauls at that depth in which 

 the three commonest species were captured, or (in the fourth column) in which one or 

 other of the three species was captured. It shows that while Collozoum inerme was fairly 

 evenly distributed, the expectation of capture of the other two species increased with 



• K. Sv. Vet.-Akad. Handlingar, Hand .34. 



t Journal Marine Biol. Assoc. 1902, p. 353 : " The Plankton of tlie Fjeroe Channel, &c." 



