362 On new genera and species of British Hydroid Zoophytes. 



set in about four longitudinal rows, the adjoining cells alter- 

 nating, and the opposite cells nearly on a line with each 

 other. 

 Height 1 to 2 inches. 



Prom the deep-water fishing-boats, on the coasts of North- 

 umberland and Durham : rather rare. 



This species comes very close to the Grammaria robusta of 

 Stimpson, of which it may possibly be a variety, the principal 

 difference being that the British form is constantly branched, 

 while the American species is linear and straight. The genus is 

 new to Europe, and does not appear to differ much from the 

 Salacia of Lamouroux founded on an Australian species. 



EXPLANATION OF PLATES XIL, XIIL, XIV. 



Plate XII. 



Figs. I, 2. Vorticlava humilis, natural size and magnified. 



Fig. 3. A tentacle of the lower row much enlarged. 



Fig. 4. Ditto of the upper row ditto. 



Figs. 5, 6. Eudendrium confertum, natural size and magnified. 



Fig. 7- A polypary of the same, magnified. 



Fig. S. A tentacle contracted and very highly magnified. 



Figs. 9, 10. Eudendrium capillare, natural size and magnified. 



Fig. 11. A polype of the same, more highly magnified. 



Fig. 12. Reproductive capsule (sperm-capsule?), more highly magnified, 



Plate XIII. 



Figs. 1, 2. Sertularia tricuspidata, natural size and magnified. 



Figs. 3, 4. tenella, natural size and magnified. 



Fig. 5. Ovicapsule of the same. 



Fig. 6. A polype-cell showing the operculum. 



Fig. 7. Campanularia volubilis, highly magnified. 



Fig. 8. Johnstoni, ditto. 



Fig. 9. Hincksii, ditto. 



Plate XIV. 



Fig. 1. Grammaria ramosa, natural size. 



Fig. 2. Another specimen magnified. 



Fig. 3. A portion of the same more highly magnified. 



Fig. 4. A section of the stem of the same. 



Fig. 5. Campanularia gracillima, nat. size. 



Fig. 6. A portion of the same, magnified. 



