128 
Z. HYDROIDA. 
Sertularia. 
when dry, straight, flattish, jointed, with a pair of opposite cells on 
each interspace ; branches patent, mostly undivided, jointed like the 
stem. Cells tubular, the upper portion free, erecto-patent, with an 
even aperture often girded with two or three faint circular wrinkles. 
Pallas says that the cells incline to one side of the stem, a character 
which Dr Fleming failed to observe, and which is not perceptible in 
any of the specimens sent me by Dr Coldstream. “ Ab eodem la- 
tere,” says Pallas, “ ovaria in pinnis plerisque mediis crebra, in se- 
riem conferta, minuta, obverse conica, supra trituberculata, et inter 
tubercula osculo instructa.” 
9. S. Hibernica, u greater and lesser branches alternately pin- 
nated ; denticles alternate , elliptical , with emarginate mouths ; 
vesicles ovate , with a denticulate mouth and transverse undulated 
striae” 
Sertularia pinnata, Templeton in Mag. Nat. Hist, ix, 468. 
Hab. “ Dredged up, with other marine productions, in the sound 
of Donaghadee. Received from Mr J. Gilles, Aug. 1805,” Tem- 
pleton. 
“ The branching of this species is somewhat peculiar, each of the 
primary and secondary branches springing out at an angle of 40° or 
50°. That part of the stem which bears the denticles is waved so 
as to bear each denticle on the projecting part ; the denticles are el- 
liptic, and the mouth of each apparently a little hollowed inwards, 
perhaps arising from the extremity being fractured ; the vesicles are 
ovate, with 4 or 5 blunt teeth surrounding the mouth, and divided 
into 6 or 8 portions by annulated undulating lines. It might be 
classed among the large and strong sertularias, the principal shoot 
being of the thickness of a sparrow’s quill at its base, and 4 in. or 
5 in. long. The branches shoot forth from opposite sides, the whole 
coralline thus assuming a flat form, to the extent of 4 in. or 5 in.” 
Templeton . 
10 . s. nigra, cells nearly opposite , small, ovate , oppressed, with 
a scarcely everted aperture ; vesicles ovate or elliptical. — Pallas. 
Vignette, No. 13, page 119. 
Sertularia nigra, Pa 11. Elench. 135. Turt. Gmel.iv.676. Bosc y Vers, iii. 106. 
Turt. Brit. Faun. 212. Jameson in Wern. Mem. i. 565. Corallina, 86. 
S. Lichenastrum, Lin. Syst. 1313. (exclus. syn.) Dynamena 
nigra, Flem. Brit. Anim. 545 La D. noire, JBlainv. Actinolog. 484. 
Hab. Lizard Point, Cornwall, Pallas. Coast of Aberdeenshire, 
Robert Brown. Scarborough from deep water, Mr Bean. Coast of 
Northumberland at Dunstanborough Castle, Mr R. Embleton. 
