Dynamena. ZOOPHYTA. SERTULARIAD^. S4S 
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 orifice. 
167. S. Templetoni . — Stems simple ; cells short and narrow. 
Flem. Edin. Phil. Journ. ii. 88 — Loch of Belfast, Mr Templeton. 
Height about an inch ; slighlly 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 narrow at the base, wide at the top, where it is truncated with a short 
central tube. 
169. D. 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.^ — Lamour. 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. CK'pressma .- — Stem with alternate branches, which are 
