256 Dr. Johnston's Catalogue of Zoophytes. 



stalks of the cells are not, properly speaking, twisted. They are constricted at very short 

 equal distances, and the central part, which is attached to the base of the Polype, is enve- 

 loped in a pellucid sheath or coat, of which the cell is merely an expansion. 

 6. C. syringa, stem creeping, slender, attached ; cells tubular or vase-like with entire mar- 

 gins, on shorter twisted stalks — Creeping Coralline. 



C. syringa, Lam. Hist. Nat. ii. 113 ; Flem. Br. Anim., 548. 



Sertularia syringa, Linn. ; Turt. Lin. iv. 680 ; Turt. Br. Faun. 214 ; Stew. Elem. ii. 444 ; 

 Bosc, Vers, iii. 113. 



Sertularia repens, Soland. Zooph. 52; Hogg's Stockton, 34; Ellis, Coral. 25, t. xiv. f. 

 b.B. 



Clytia syringa, Lamour. Corall. 89. 



Hab. Parasitical on Corallines, less common than the preceding. 



This is only to be distinguished from C. volubilis by the aid of the microscope. The 

 two species frequently grow together, and their structure is the same. Polypes campanu- 

 late, furnished with eight filiform equal tentacula, which are retractile within the cell, and 

 can be shortened at will. The tentacula of the polypes of Tubularia, on the contrary, are 

 not retractile, neither do they seem capable of being shortened, but they can be rolled up 

 in a spiral form. 



9. SERTULARIA. 



1 S. polyzonias, stem erect, scarcely ziz-zag, irregularly and loosely branched ; branches 

 patent ; cells alternate, sessile, smooth, everted, somewhat flask-shaped, the margin 

 uneven. — Great Tooth Coralline. 



S. polyzonias, Linn.; Soland. Zooph. 37; Turt. Lin. iv. 683; Turt. Br. Faun. 216; 

 Stew. Elem. ii. 447 ; Lam. Hist. Nat. ii. 117; Bosc, Vers, iii. 119; Lamour. Corall. 

 83 ; Hogg's Stockton, 31 ; Flem. Br. Anim. 542. 



Great Tooth Coralline, Ellis, Corall. 5, t. ii. No. 3, f. a. A. b. B. 



Hab. On shells and other Corallines from deep water. 



Height about one inch : branches very few, often simple. Cells rather distant, tubular, 

 but dilated at the base. 



2. S. abietina, stem erect, rather stout, slightly ziz-zag, pinnate ; pinnae regularly alter- 

 nate, patent, bifarious ; cells nearly opposite, everted, bellied, the orifice narrowed and 

 entire. Sea Fir Coralline. 



S. abietina, Linn. ; Soland, Zooph. 36 ; Turt. Lin. iv. 676 ; Turt. Br. Faun. 212 ; 

 Stew. Elem. ii. 441 ; Lam. Hist. Nat. ii. 116 ; Lamour. Corall. 81 ; Bosc, Vers. iii. 

 106 ; Stark, Elem. ii. 440 ; Hogg's Stockton, 31 ; Loud. Journ. i. 278, f. 148, a. 



Dynamena abietina, Flem. Br. Anim. 543. 



Sea-Fir, Ellis, Corall. 4, t. ii. No. 2, f. b. B. 



Abies marina, Sib. Scot. 111. lib. quart. 55 ; Ger. Herb. 1574, cum fig. non laudata. 



Corallina marina abietis forma, Raii Syn. 35, No. 12. 



