3G2 On new genera and species of British Hydroid Zoophytes. 



set ill al)out four longitudinal rows, the adjoininp; cells alter- 

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

 other. 

 Height 1 to 2 inches. 



From 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. 1, 2. Vortichwn humilis, natural size and magnified. 



Fig. 3. A tentacle of the lower row much enlarj^ed. 



Fig. 4. Ditto of the upper row ditto. 



Figs. 5, <). Eudendrinm confer turn, natural size and magnified. 



Fig. 7- A polyj)ary of the same, magnified. 



Fig. •<. 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. \'2. Ileproductive capsule (sperm-capsule?), more highly magnified. 



Plate XIII. 



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



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



Fig. 5. Ovicapsule of the same. 



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



Fig. 7. Cumpanuluria vohihilis, 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. 



