SEPEUONIUM. 



[ 690 ] 



SERTULARIID^E. 



coil, composed of about 3 joints, one of 

 which swells into a rough-coated spore. 



Zyyodesmus. Filamentscreeping, branched, 

 ■v^-ith short ramulibeaiing echiuate spores, the 

 pedicels with a lateral indentation looking 

 like a joint. 



SEPEDO'NIUM, Link.— A genus of Se- 

 pedoniei (Hyphomvcetous Fungi), contain- 

 ing two species, growing upon decaying 

 Fungi. S. chrysospenna has golden-yellow 

 spores, S. roseum red ones. The first is 

 common. The species are all forms of 

 Sphferiacei. 



BiBL. Berk. Br. Fl. ii. pt. 2. 350 ; Fries, 

 Sum. Vey. 497 ; Grev. Crypt. Flor. pi. 198. 



SEPIA, Linn. — A genus of Cephalopoda. 

 The structure of the dorsal internal shell of 

 S. officinalis, the cuttle-fi^h, called the cuttle- 

 bone or sepiostaire, presents a curious struc- 

 ture. It is oval, flat, convex, horny outside, 

 the interior being calcareous and composed 

 of numerous friable, horizontal, parallel, cal- 

 careous plates, separated by innumerable 

 minute perpendicular flattened columns, 

 with transverse thickenings at pretty regular 

 intervals, producing a striated appearance. 

 When mounted in balsam, it forms an in- 

 teresting polarizing object. 



SEPTONE'MA, Corda.— A genus of To- 

 rulacei (Coniomycetous Fun- 

 gi), related to Tom la, and 

 connecting this in some mea- 

 sure with Dendryphium. S. 

 spiloma, forming gi-een tufts 

 on old rails, has been found 

 in Guernsey. Several spe- 

 cies are recorded as French 

 by Leveille, one forming 

 patches on vine-leaves, the 

 others on the potato. The 

 chains of septate spores soon 

 break up. 



BiBL. Corda, Ic. i. & ii. ; 

 Fries, Stim. Vey. 504 ; Le- 

 veille, Ann. Sc. Nat. 3. ix. 

 261 ; Berkeley and Broome, 



Ann. N. H. 2. v. 461 ; Berk. Septonema viride. 



Fig. 640. 



Lond. J. Bot. iv. t. 12. fig. 5. 

 SEPTO'RIA, Fr.— A ^e- 



Magnified 150 

 diameters. 



nus of Sphaeronemei ( Coniomycetous Fungi), 

 but probably in reality consisting of pre- 

 paratory forms of Sphcerife. They grow 

 upon the leaves of plants, the fusifoim sep- 

 tate or inarticulate thread-like " spores " 

 oozing out from a pore in the form of a 

 tendril. 



<S'. Ulmi and <S'. OxyacanthfP are common; 

 numerous other species ai'e recorded. 



BiBL. Berk. Br. Fl. ii. pt. 2. 356; Berk, 

 and Br. Ann. N. H. 2. v. 379, xiii. 460 ; 

 Tulasne, Ann. X. H. 2. viii. 117, 4. v. 115. 



SEPTOSPO'EIUM. See Macrospo- 



HIUM. 



SERIALA'RIA, Lamarck. — A genus of 

 Vesiculariidse (Polyzoa). *S'. lendiyera, the 

 only British species, is not uncommon on 

 Fuci, near low-water mark. (Ilincks, Polyz. 

 515.) 



SEROUS MEMBRANES.— These con- 

 sist of the same elements, an-anged in the 

 same number of layers as in the Mrcous 

 Membranes. The thickness of the layers, 

 however, is considerably less, the fibrous 

 elements are finer, and the epithelium forms 

 a single layer only of polygonal cells. The 

 communication of the lymphatics with the 

 so-called stomata is noticed at p. 485. 



BiBL. That of Tissues, Animal. 



SERRA'TOR, Megnin. See Acarls, 

 p. 5 (Megnin, Paras. 144). 



SERTULAREL'LA, Gray.— A genus of 

 Sertulariidfe (Hydroid Zoophytes). 



Char. Cells biserial, alternate, with a 

 toothed orifice and an operculum composed 

 of several pieces. -S'. riiyosa (formevlj- Ser- 

 tuhiria ?•., PL 41. figs. 11 & 12); common 

 upon Flusf.rfe, Fuci, &.c. at low-water mark. 

 (Hincks, Br. Hydr. 234.) 



SERTULA'RIA, Linn.— A genus of Hy- 

 di'oid Zoophytes, family Sertidariidaj. 



Char. Polypidom plant-like, fixed by its 

 base, variously branched, the branches 

 formed of a single tube, denticulated or ser- 

 rated with the cells, and jointed; cells alter- 

 nate, semialternate, or opposite, biserial, 

 sessile, urceolate, with everted apertures ; 

 ovarian vesicles scattered. 



Many of these elegant zoophytes, which 

 would at once be referred to the vegetable 

 kingdom by any casual observer, are com- 

 monly found on the sea-coast, either loose 

 or attached to shells, sea-weeds, &c. 



S.jmmila (PI. 41. figs. 13 & 14). Cells 

 opposite, approximate, shortly tubular, the 

 top everted, with an oblique somewhat mu- 

 cronate aperture ; vesicles ovate ; common 

 on Fuci near low-water mark. 



S. operculata (PL 41. figs. 15 & 16). Cells 

 opposite, inversely conical ; aperture patu- 

 lous; obliquely truncate, pointed on the 

 outer edge, and with two small lateral 

 teeth ; vesicles obovate. 



BiBL. Johnston, Brit. Zoophytes, 61 ; 

 Hincks, Hi/dr. Zooph. 250. 



SERTULARITD^E.— A famUy of Hy- 

 droid Zoophytes. 



