/. W. Bailey on Microscopic Forms in the Sea of Kamstchatka. 5 

 Length 4 m . Diameter 2f m . 



This shell resembles some of the varieties of E. lineatum of 

 Ehrenberg, but differs in having the cells much less distinct, the 

 walls thicker, and the surface with a reticulated appearance due 

 to the small elevations or granules placed upon the longitudinal 

 ridges. 



Eucyrtidium tumidulum B. PI. I, fig. 11. Shell subfusiform ; 

 head rounded, without spines ; articulations three or more, each 

 having from four to six transverse rows of large cells of nearly 

 uniform size arranged in a decussating manner. 



Length 4 m . Diameter 2 m . Cells 4 to 5 in l m . 



A species closely resembling this is common in the Atlantic 

 soundings. 



Eucyrtidium cuspidatum B. PL I, fig. 12. Shell conical with 

 eight or more articulations, head rounded and bearing a long 

 curved setiform process. 



Length of shell 6 m . Length of setula 5 m to 6 m . 



In the Atlantic soundings is found a species closely resembling 

 this, except that it has not been seen with the setiform process. 

 I have called it C. Tritonis. 



Halicalyptraf cornuta B. PI. I, fig. 13-14. Shell dome shaped 

 or campanulate, with a rounded head, armed with two spines. 

 Second articulation (or body) having large cells or openings 

 arranged in transverse and decussating rows. 



Length 4 m to 6 m . Diameter at base 3 m to 4 m . Cells nearly 

 l m in diameter near the base of cell, and showing four to five in 

 each transverse row. 



Lithobotrys inflatum B. PI. I, fig. 15. Shell ovoidal, head 

 composed of two or three small rounded cells. Body with one 

 large inflated cell with a slight transverse constriction. Surface 

 with cells of unequal size. 



Length 3 m . Diameter If m . 



Perichlamidium venustum B. PL I, fig. 16 and 17. Shell 

 discoidal with a thickened spongiform central mass, and a broad 

 cellulose margin with numerous rays prolonged into projecting 

 spines. 



Diameter 10 m to 15 m . Width of margin l in to 2 m . 



This shell is not rare in these soundings, and is, I believe, the 

 first of its genus that has been found in the recent state. 



Rhizosolenia hebetata B. PL I, fig. 18, 19. Shell calyptriform, 

 punctate, with a smooth cylindrical base. Apex expanded, lat- 

 erally compressed and having a rounded and retuse end. 



This is one of the most common forms in these soundings, and 

 also occurs in the sea of Ochotsk. The punctate conical portions 

 are most frequently seen, but specimens with the cylindrical base 

 are occasionally found. 



Stylodictya stellata B. PL I, fig. 20. Shell with five or more 

 concentric rings, the outer one armed with short spines. 



