378 



CHAS. W. HARGITT. 



there are as many as four of these rings with an operculum at 

 the summit." Such series of rings I have found to be rather 

 common ; but it has not been possible to distinguish, even with 

 high powers, the " ornamental markings " to which Clarke makes 

 reference. The surface of these secondary, or additional rings 

 is quite as devoid of such markings as is that of the original 

 hydrotheca itself. 



CALYCELLA NUTTINGI, n. sp. (Figs. 6, 7.) 



Growing upon colonies of the bryozoon, Bugula turrita, taken 

 at the fishing grounds off Sankety, and later at Woods Hole, and 

 even still later at Harpswell, Maine, I have found a microscopic 

 species of Calycella, which seems to be undescribed. It is hardly 

 more than one tenth the size of an average specimen of C. syringa, 

 and differs in other respects as well. Its very minute size may 

 probably account for the fact of its having been overlooked in 



FIG. 6. 



FIG. 7. 



spite of continuous collecting throughout the region for many 

 years. The following characters are diagnostic of the species : 

 Trophosome. Colony composed of a creeping, filiform stolon, 

 slightly, if at all, reticulated, from which at very irregular inter- 

 vals arise the hydrothecae. These are tubular, though not quite 



