244 Dr. Johnston's Catalogue of Zoophytes. 



nearly the colour of the body ; inner margin of the oral disk ornamented with a circle 

 of azure-blue tubercles. 

 A. equina, Linn.; Flem. Brit. Anim. 497; Cuv. Reg. Anim. iii. 292. 

 A. mesembryanthemum, Soland. Zooph. 4; Turt. Lin. iv. 104; Turt. Br. Faun. 131 ; 



Encyclop. Method, tab. 73, fig. 3, copied from Gartner. 

 A. hemispherica, Pen. Brit. Zool. iv. 104. 

 A. rufa, Stew. Elem. i. 393 ; Lam. Hist. Nat. iii. 67 ; Encyclop. Method, tab. 71, fig. 



6—10. 

 Hydra disciflora, tentaculis retractilibus, extimo disci margine tuberculato, Gartner in 



Phil. Trans. Iii. 83, tab. 1, fig. 5. 

 Hab. On rocks between low and high water mark, very common. 



Body one or one and a half inch in diameter, hemispherical when contracted. The base 

 is o-enerally of a uniform greenish colour encircled with an azure blue line, but frequently 

 it is streaked with red, and the blue marginal line is wanting. Gartner says that " the 

 colour of its body is always red in the summer, but changes into a dusky green, or brown, 

 towards the latter end of autumn," a remark which certainly does not hold good here ; and 

 the red and dusky green varieties may be found at all seasons. The following varieties 

 are worthy of more particular notice : — 



(a) Body olive brown, streaked with lines of a fine blueish colour ; tentacula unvarie- 

 gated. 



(b) Body olive coloured, sub-cylindrical, spotted with numerous white dots; tentacula 

 annulatated with white. 



(c) Body sub-cylindrical, greyish, with numerous white longitudinal lines ; tentacula uni- 

 serial, annulated with white. This is the Actinia viduata of Muller. Lam. Hist. Nat. 

 iii. 68. Encyclop. Method, tab. 72, figs. 4, 5 ; bonce. Turt. Lin. iv. 101. 



2. .A senilis, body conoidical, variously coloured, rough, with glandular warts ; tentacula 

 numerous, biserial, shorter than the diameter of the oral disk, thick, and generally va- 

 riegated with red and white rings. 



A. senilis, Linn.; Lam. Nat. Hist. iii. 68; Flem. Brit. Anim. 498; Cuv. Reg. Anim. 

 iii. 291 ; Penn. Br. Zool. iv. 105. 



A. gemmacea, Soland. Zooph. 3; Turt. Lin. iv. 104; Turt. Br. Faun. 130; Wern. 

 Mem. i. 558. 



A. verrucosa, Penn. Br. Zool. iv. 103 ; Lam. Hist. Nat. iii. 70 ; Encyclop. Method, tab. 

 70, fig. 1, copied from Gartner. 



A. crassicornis, Turt. Lin. iv. 100 ; Turt. Br. Faun. 131 ; Stew. Elem. i. 393 ; Wern. 

 Mem. i. 558; Lam. Hist. Nat. iii. 67 ; Penn. Br. Zool. iv. 105. 



A. coccinea, Turt. Lin. iv. 101 ; Lam. Hist. Nat. iii. 68. 



A. felina, Barb. Gen. Verm. 53, tab. 5, fig. 6. 



A. equina, Turt. Br. Faun. 131 ; Soiverby, Brit. Misc. tab. 4. 



Hydra disciflora, tentaculis retractilibus subdiaphanis ; corpore cylindrico, miliaribus 

 glandulis longitudinaliter striato, Gartner in Phil. Trans. Hi. 82, tab. 1, fig. 4. 



