46 CELLULARIIDiE. 



enlargement (without fibrils); or furnished with hooks. 

 Primary cell with a round aperture and eight marginal 

 spines, four on the upper border and four in front. 

 Pohjpide with 12 to 16 long tentacles, of a light orange 

 colour. 



Habitat. Between tide-marks, under stones &c., and 

 on Laminaria, Flustra, stones, shells, zoophytes, &c. 

 from shallow to deep water (40-80 fathoms, Shetland). 



Localities. Generally distributed round our coasts. 



Geographical Distribution. Ostend, on Flustra 

 (Van Beneden) : French coasts (Kirchenpauer) : North Sea 

 to Bahusia and Middle Norway, common (Smitt) : Heligo- 

 land ; Iceland ; North America (Kirchenpauer) : Adriatic, 

 common (Grube and Heller) : Lyall's Bay, New Zealand 

 (F. W. Hutton). 



Range in Time. Coralline crag (A. Bell) : Scotch 

 Glacial deposits (Geikie). 



This is one of our commonest Polyzoa. Its nearest 

 British ally is S. elliptica ; but, as I have pointed out in 

 the account of that species, the two are distinguished 

 from one another by a group of w^ell-defined differences. 

 The lateral avicularia in the present species are very fully 

 developed, compensating, we may suppose, by their size 

 and prominence for the total absence of auxiliary organs 

 on the front of the zoarium. They are smallest at the 

 base of the internodes, and increase in size as they ap- 

 proach the top. 



SCRUPOCELLARIA ELLIPTICA, RCUSS. 



Plate VI. figs. 5,6. 



SCRUPOCF.LLAUIA ELLIPTICA, Beuss, Fossil. Brjoz. d. osterreich.-ungar. Mio- 

 cans, 8, plate ii. figs. 1-9. 



