Dynamena. ZOOPHYTA. SERTULARIADtE. 543 



Height several inches, erect and stiff; base of numerous tubes, which, by 

 uniting, form those larger parallel connected tubes of which the stem consists; 

 the smaller branches are simple, and diverge at a regular angle, each support- 

 ing a few alternate tubular cells, with one or two transverse wrinkles ; vesicles 

 on the sides of the branches, irregularly oval, with a tube on one side, a little 

 produced at the summit. 



166. S. muricata, — Stem compound, irregularly branched, 

 cells short and narrow. 



Sol. Ellis, Zooph, 59. t. vii. f. 3. — In deep water, on old shells, several 

 fathoms beyond low water-mark. 



Height two or three inches; stems erect, irregularly divided ; branches short 

 and simple, the joints are well marked ; the cells are short and narrow ; the ve- 

 sicles, which are attached to the stem by a short and narrow stalk, are globular, 

 with longitudinal spinous ridges. Though not uncommonly brought ashore 

 by the Newhaven oyster-boats from the Forth, I have never obtained a per- 

 fect specimen. The cells, when most entire, seem cylindrical, wrinkled 

 across, and somewhat contracted towards the notched orfece. 



167. S. Templetoni. — Stems simple ; cells short and narrow. 



Flem. Edin. Phil. Journ. ii. 88— Loch of Belfast, Mr Templeton. 



Height about an inch ; slightly branched ; cells narrow, tubular, produced ; 

 the vesicles oval, lengthened, narrow at the base, covered towards the sum! 

 mit, with lanceolate spines — This species is of a more delicate texture than 

 the preceding, the vesicles are of a different shape, and the stem is simple. 

 It was given to me by an accomplished naturalist, the late Mr Templeton of 

 Orange Grove, Belfast. It adheres apparently to a gramineous leaf, proba- 

 bly of a zostera, and therefore may be considered an inhabitant of shallow 

 water. 



Gen. LXIV. DYNAMENA.— Cells in pairs, opposite, usually 

 with a joint above and below each. 



168. D. tamarisca. — Loosely branched alternately ; cells cy- 

 lindric, truncated, with an uneven margin. 



Sea Tamarisk, Ellis, Cor. 4. t. i. f. 1 — Sertularia tarn. Linn. Syst. i. 1307 

 Pall. El. 129. Lamb. Cor. Flex. 188 — On old shells in deep water. 

 Height sometimes nearly a foot ; branches few, spreading ; cells oblique ; 

 vesicles nan-ow at the base, wide at the top, where it is trimcated with a short 

 central tube. 



169- D. ahletina. — Branches rather close, alternate, making 

 the stem bifariously pinnated ; cells subcylindrical, with even 

 margins. 



Sea Fir, Ellis, Cor. 4. t. i. f. 2 — Sertularia ab. Linn. Syst. i. 1307. Pall. 

 El. 133.— Lawiowr. Cor. Flex. 187. — Very common beyond low water 

 mark. 



Height nearly a foot ; stem arising from wrinkled tubes, which adhere to 

 stones or shells ; the cells are usually opposite, sometimes alternate, and the 

 stems seldom exhibit any joints ; vesicles egg-shaped, with a narrow base, and 

 a contracted subtubular summit. 



170. D. cupi-ess'ma. — Stem with alternate branches, which are 



