126 Z. HYDROIDA. Sertularia. 



Coralliiia pumila repens, minus ramosa, Rail, Syn. i. 37, no- 19 C- 



pumila erecta, lamosior, 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 I'Acad. Roy. des Sc. an. 1711, 



394, pi- 11, fig. 4, M Sea-oak Coralline, £Z/js, CoraU. 9, no. 8, pi. 



5, fig a, A- Phil- Trans, xlviii- 632, pi. 23, no. 6. Phil. Trans. Ivii. 437, 

 pi. 19, fig. 11. Phil. Tians. abridg. x, 493, pi. 12, fig. 6, F Sertu- 

 laria pumila, Lin. Syst. 1306. Pall. Elench. 1-30. Ellis and Soland. 

 Zooph. 40- Berk. Syn. i. 213. 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. 

 Bosc, 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, Cavoh Pol- mar. 216, tav. 8, fig. 8-10 Dynamena 



pumila, Lamoiir. Cor. Flex. 179. Corallina, 79. Flem. Brit. Anim. 544. 



La D. naine, Blainv. Actinol. 484. 



Hah. Near low-water mark common, parasitical on various Fuel, 

 particularly F, vesiculosus and serratus- Also on oyster shells. 



The polypiferous shoots oi'iginate 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 paii's 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." 

 Steivart, 



" 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 j 



micas investigavit." Prod. Flor. Nov. HoU. p- 7 — See also Pulteney's Sketches, 

 V. ii. p. 107-9. 



