NEBELA CAUDATA. 125 



Rare in Britain. Reported (with a query) by Dr. 

 Penard (' Proc. Royal Society of Edinburgh,' 1904-5) as 

 occurring in a gathering from Loch Ness, sent to him 

 for examination by Mr. James Murray ; and afterwards 

 by Mr. Murray as having been observed there by Mr. 

 Scourfield. 



This is the only known species of Nebela possessing- 

 any kind of caudal appendage. Though abnormal in 

 that respect, the structure of the test otherwise seems 

 to conform to that of the genus. The processes are of 

 the same chitinous substance as the test, and grow out 

 of it ; they are irregularly disposed, and blunt at their 



FIG. 99. Nebela caudata. After Leidy, loc. cit. (reduced to one-half). 

 a, broad view of an empty test ; b and c, broad views of two 

 encysted individuals ; d, narrow view of the latter, x 250. 



extremities ; in some cases curved. The test, in broad 

 view, has convex sides, which descend evenly down to 

 the truncated mouth, but in narrow lateral view a dis- 

 tinct neck is shown, the test being strongly compressed, 

 particularly in its lower half. 



[19. Nebela triangulata (Lang). 

 (Fig. 99.) 



Difflugia triangulata LANG in Q. Jrn. Micr. Sci. (n.s.) V 

 (1865), p. 285, 2 ff. (p. 285) ; ARCHER in Q. Jrn. Micr. 

 Sci. (n.s.) VII (1867), pp. 174, 177; op. cit. XII (1872), 

 p. 195; in Jrn. Dublin Micr. Club, I, 2 (1867), pp. 118, 

 121 ; and op. cit. II, 1 (1872), p. 121. 



Test rather small, very transparent, composed of 



