J". W. Bailey on Microscopic Forms in the Sea of Kamtschatka. 3 



abundance in the Antarctic ocean, but it is not confined to high 

 latitudes, as a species occurs in considerable numbers in soundings 

 from the Gulf of Mexico, and from the Gulf Stream. 



Cadium, nov. gen. Animal unknown (a Ehizopod?). Shell 

 siliceous ! ovoidal, with a bent beak and circular aperture. 



Cadium marinum B. PL I, fig. 2. Shell with numerous merid- 

 ian lines, of which about twelve are visible at once, Length 2 m . 

 Diameter lj m . 



I propose the genus Cadium to include some small shells whose 

 siliceous nature I have fully proved, and which occur in the 

 above mentioned soundings, as well as in the Gulf Stream. 



In the specimen figured, from ten to twelve longitudinal striae 

 were seen at once on the upper surface of the shell, but in some 

 specimens from the Gulf Stream the striae were about twice as 

 numerous. 



Ceratospyris borealis B. PL I, fig. 3. Shell semi-globose, 

 flattened and spinose at base composed of a coarse net- work of 

 strong rounded bars. Cells or perforations large, unequal. 



Diameter 5 m to 6 m . Height 4 to 5 m . 



Chcetoceros furcillatum B. PL I, fig. 4. Shells very minute, 

 with the setae of adjoining frustules closely approximate and 

 nearly parallel for a portion of their length, then diverging and 

 afterwards becoming nearly parallel. Length of the body, 0*2 m 

 to 0'4 m . Total length including setae about 2 m . This species 

 which is one of the minutest of its genus is quite common in the 

 Sea of Kamtschatka and I have also found it in mud taken from 

 the head of a whale captured in the sea of Ochotsk. 



Cornutella t annulata B. PL I, fig. 5, a. b. Shell elongated, 

 digitiform or somewhat conical, with a rounded apex and termi- 

 nal spine. Cells or perforations arranged in transverse lines, four 

 to six being visible at once in each ring. 



Length 3 m to 6 m . Length of spine -J m . 



Coscinodiscus Oculus Iridis? Ehr. In these soundings there 

 is a considerable number of large Coscinodisci identical with a 

 species occurring fossil at Eichmond, Virginia, which I suppose to 

 be C. Oculus Iridis of Ehrenberg, but Ehrenberg's figure of that 

 species in Mikrogeologie pi. xviii, fig. 42, was probably drawn 

 from a small specimen ; as the species both in the recent and 

 fossil species often acquires a size not much inferior to that of 

 Coscinodiscus Gigas. My measurements of specimens in these 

 soundings give its diameter as ll m to 12 m , and the cells where 

 largest were 8 in l m , measured in the direction of the radii. The 

 star or rosette of the centre is formed by six or more polygonal 

 cells. 



Coscinodiscus borealis B. (Not figured.) Disc having at its 

 depressed centre, a conspicuous star formed of about six large 

 cells. The rest of the surface covered with interruptedly radiant 

 lines of prominent hexagonal cells, which increase regularly from 

 near the centre to the convex margin of the shell. 



