126 
Z. HYDROIDA. 
Sertularia. 
Corallina pumila repens, minus ramosa, Rail , Syn. i. 37, no. 19 C. 
pumila erecta, ramosior, Ibid. 37, no. 20. pi. 2, fig. 1. Muscus ma- 
rinus lendigenosus minimus arenacei coloris, Morris . Plant, hist, iii, 650, 
tab. 9, fig. 2 Reaumur in Mem. de l’Acad. Roy. des Sc. an. 1711, 
394, pi. 11, fig. 4, M. Sea-oak Coralline, Ellis, Corall. 9, no. 8, pi. 
5, fig a, A. Phil. Trans, xlviii. 632, pi. 23, no. 6. Phil. Trans, lvii. 437, 
pi. 19, fig. 11. Phil. Trans, abridg. x, 493, pi. 12, fig. 6, F Sertu- 
laria pumila, Lin. Syst. 1306. Pall. Elench. 130. Ellis and Soland. 
Zooph. 40. Berk. Syn. i. 215. Turt. Gmel. iv. 676. Wern. Mem. i. 
564. Turt. Brit. Faun. 212. Stew. Elem. ii. 441, pi. 12, fig. 10, 11, 
copied from Ellis. Lam. Anim. s. Vert. ii. 119. 2de edit, ii, 145. 
Bose , Vers, iii. 105. Hogg's Stockton, 32. Stark, Elem. ii. 440, pi. 8, 
fig. 14. from Ellis. Johnston in Trans. Newc. Soc. ii. 259. Lister in 
Phil. Trans, an. 1834, 371, pi. 8, fig. 3. Templeton, lib. cit. 468. 
Sertolara pumila, Cavol. Pol. mar. 216, tav. 8, fig. 8-10. Dynamena 
pumila, Lamour. Cor. Flex. 179. Corallina, 79. Flem. Brit. Anim. 544. 
La D. name, Blainv. Actinol. 484. 
Hab. Near low-water mark common, parasitical on various Fuci, 
particularly F. vesiculosus and serratus. Also on oyster shells. 
The polypiferous shoots originate from a slender tubular thread which 
creeps along the surface of the fucus, and connects them all together. 
The shoots are very numerous, often covering a considerable space 
of the sea-weed, seldom more than half an inch in height, of a dusky 
horn colour, and thickish texture, sparingly branched, filiform, flattish, 
serrated with the cells, which are divided in pairs by a,dissepiment or 
joint. The polypes have 14 tentacula, and when the animal displays 
them, it at the same time extrudes the body far beyond the rim of 
the cell. The vesicles are copiously produced during the summer 
months, and are irregularly distributed over the branches: they are sub- 
sessile, ovate with a short tubulous rim, smooth, or sometimes wrink- 
led circularly : in the centre a placentular column is at seasons obvi- 
ous, and in June 1 have found them filled with innumerable pellucid 
granules floating in an amniotic liquor. 
“ This species, and probably many others, in some particular states 
of the atmosphere, gives out a phosphoric light in the dark. If a leaf 
of the above Fucus (serratus,) with the Sertularia upon it, receive 
a smart stroke with a stick in the dark, the whole coralline is 
most beautifully illuminated, every denticle seeming to be on fire.” 
Stewart. 
“ While thus with pleasing wonder you inspect 
Treasures the vulgar in their scorn reject, 
See as they float along th’ entangled weeds 
Slowly approach, upborne on bladdery beads ; 
micas investigavit.” Prod. Flor. Nov. Holl. p. 7 — See also Pulteney’s Sketches, 
v. ii. p. 107-9. 
