SEPEDONIUM. 



[ 690 ] 



SERTULARIIDJE. 



coil, composed of about 3 joints, one of 

 which swells into a rough-coated spore. 



Zygodesmus. Filamentscreeping, branched, 

 with short ram uli bearing echinate spores, the 

 pedicels with a lateral indentation looking 

 like a joint. 



SEPEDO'NIUM, Link. A genus of Se- 

 pedomei (Hyphomycetous Fungi), contain- 

 ing two species, growing upon decaying 

 Fungi. & chrysosperma has golden-yellow 

 spores, S. roseum red ones. The first is 

 common. The species are all forms of 

 Sphseriacei. 



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

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



SEPIA, Linn. A genus of Cephalopoda. 

 The structure of the dorsal internal shell of 

 S. officinalis, the cuttle-fish, 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- 



Fig. 640, 



rulacei (Coniomycelous Fun- 

 gi), related to ~Torula, and 

 connecting this in some mea- 

 sure with Dendryphium. S. 

 spiloma, forming green tufts 

 on old rails, has been found 

 in Guernsey. Several spe- 

 cies are recorded as French 

 by LeVeiUe", 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, Sum. Veg. 504; Le"- 

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

 261 ; Berkeley and Broome, 

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

 Lond. J. Bot. iv. t. 12. fig. 5. Magnified 150 



SEPTO'RIA, Fr. A ge- diameters. 



nus of Sohaeronemei (Coniomycetous Fungi), 

 but probably in reality consisting of pre- 

 paratory forms of Sphcerice. They grow 

 upon the leaves of plants, the fusiform sep- 

 tate or inarticulate thread-like (( spores " 

 oozing out from a pore in the form of a 

 tendril. 



S. Ulmi and S. Oxyacanthce are common ; 

 numerous other species are recorded. 



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

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

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



SEPTOSPO'RIUM. See MACROSPO- 

 BIUM. 



SERIALA'RIA, Lamarck. A genus of 

 Vesiculariidae (Polyzoa). S. lendiyera, the 

 only British species, is not uncommon on 

 Fuci, near low-water mark. (Hincks, Poh/z. 

 515.) 



SEROUS MEMBRANES. These con- 

 sist of the same elements, arranged in the 

 same number of layers as in the Mucous 

 MEMBRANES. The thickness of the layers, 

 however, is considerably less, the fibrous 

 elements are finer, and the epithelium forms 

 a single layer onlv 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, M^gnin. See ACARUS, 

 p. 5 (Me"gnin, Paras. 144). 



SERTULAREL'LA, Gray. A genus of 

 Sertulariidse (Hydroid Zoophytes). 



Char. Cells biserial, alternate, with a 

 toothed orifice and an operculum composed 

 of several pieces. 8. rvgosa (formerly Ser- 

 tidaria r., PI. 41. figs. 11 & 12); common 

 upon Flustrce, Fuci, &c. at low-water mark. 

 (Hincks, Br. Hydr. 234.) 



SERTULA'RIA, Linn. A genus of Hy- 

 droid Zoophytes, family Sertulariidae. 



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.pumila (PL 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, Hydr. Zooph. 259. 



SERTU'LARITD^. A family of Hy- 

 droid Zoophytes. 



