4 /. W. Bailey on Microscopic Forms in the Sea of Kamtschatka . 



Diameter 7 m to 8 m . Largest cells 5 to 6 in l m . 



This resembles the preceding, but the cells forming the star are 

 more rounded and the other cells are larger than in C. Oculus 

 Iridis. 



Coscinodiscus crassus B. (Not figured.) Disc without a central 

 star, covered with interruptedly radiant lines of large prominent 

 hexagonal cells with circular pores, cells increasing slightly in size 

 towards the margin of the shell. 



A common species in these soundings, and also found fossil at 

 Monterey, California. 



Gyclotella perienuis B. (Not figured). Shell minute, slightly 

 convex, very thin, with very minute cells or dots arranged in a 

 radiant manner. 



Diameter about 2 m . Cells 30 or 40 to l m , arranged so as to 

 produce radiant lines and eccentric curves. The markings are 

 scarcely visible by an excellent ^--inch objective, but become 

 quite distinct under a J-inch objective when seen by oblique 

 light. 



Dicladia Mitra B. PI. I, fig. 6. Shell having two conical horns 

 coalescing below into a conical base, and bearing branched pro- 

 cesses above. 



Diameter of base l m to lj m . Height including the processes l-J™. 



Difflugia t marina B. PL I, fig. 7. Shell siliceous, ovoidal or 

 lagenoid, with a contracted neck and circular aperture. Surface 

 divided by oblique lines into quadrilateral spaces. 



Length 2J m . Diameter If*. 



A single specimen of this shell was found in soundings from 

 the depth of 2750 fathoms which had been cleaned with acids. 

 Its siliceous nature is therefore certain. It is probably the shell 

 of a Ehizopod allied to Difflugia, but as I believe that all the 

 known species of that genus are fluviatile, it is doubtful whether 

 this form should be associated with them. 



Dictyophimus gracilipes B. PL I, fig. 8. Shell triquetrous, 

 head rounded, bearing a terminal spine. Body or second articu- 

 lation having large unequal cells, and three acute ridges pro- 

 longed into long acute basal spines. 



Length including spines 4^ m . Cells 3 to 4 in l m . 



Eucyrtidium aquilonaris B. PL I, fig. 9. Shell with a rounded 

 head and three (or more?) inflated articulations having large 

 cells or perforations arranged in transverse rows, the spaces be- 

 tween the cells being irregularly granulate. Lower cell abruptly 

 contracted at base and prolonged into a neck. 



Length 5 m to 6 m . Diameter of lower articulation 3 to 4 m . 



Eucyrtidium hyperboreum B. PL I, fig. 10. Shell somewhat 

 cylindrical, with a rounded head and three to five (or more ?) 

 articulations. Surface marked with longitudinal ridges bearing 

 minute granules. Cells or perforations in transverse rows, often 

 nearly obsolete. 



