SYNURA. 



[ 749 ] 



TABELI.AEIA. 



orifices, without rays. One species : S, Jle- 

 bri'ilicus, 



BiBL. Gosse, Mar. Zool. ii. 34. 



SYNU'EA, Ehr.— A doubtful genus of 

 Volvocineiio (Coufervoid Algfe), consistiug 

 of a number of oblong corpuscles attached 

 together by their prolonged iiliform pos- 

 terior extremities to form a globe ; Hagella 

 two ; no eye-spot. In S. Uvella the corpus- 

 cles are yellowish, the tails three times as 

 long as the bodies ; diameter of globes 

 1-290". See Vol vox. (Ehi-. /«/. 6 ; Kent, 

 Inf. 411.) 



"SYRINGID'IUM, Ehr. — A genus of 

 Diatomacea}. 



Char. Frustules single, terete; valves acu- 

 minate at one end, two-horned at the other. 

 Marine. 



S. bicorne (PL 18. fig. 32). Frustules 

 oblong, smooth, not striated, turgid in the 

 middle, one end attenuate, with two slight 

 constrictions, and acuminate, the other sub- 

 globose, tursrid, and with two horns. Length 

 1-370". Coast of Africa. 



S. pahemon (PI. 18. fig. 33). 



BiBL. Ehr. Ber. Berl. Ah 184.5, 365; 

 Kiitz. Sp. Alg. 32 ; Pritc-hard, Inf. 866. 



SYRINGOSPH^'RID^, Duncan.— 

 An extinct Order of Rhizopoda. Free, 

 globular, sometimes 3" in diameter, consist- 

 ing of congeries of tubes (1-1000 to 1-300 

 inch), in radial groups, with an iuterradial 

 reticulation of inosculating tubes, some of 

 which appear at the sm-face. Syringo- 

 sphcera, 5 species, and Stuliczkaria, 1 species, 

 Triassic (?), N. India, known as " Kara- 

 koram Stones." 



BiBL. Duncan, Ann. N. H. 5. ii. 297; 

 Yarkand Miss. mid; Qu.J. Geol. S. xxxviii. 



69. 



SYSTEPHA'NIA, Ehr. —A genus of 

 Diatomaceae. 



Char. Frustules circular ; valves alike, 

 areolar, neither radiate nor septate, with a 

 crown of spines or an erect membrane on 

 the outer surface of each valve (not on the 

 margin). Foss^il. 



S. corona (PI. 18. fig. 57) ; 'S'. diadema 

 (fig. 58). 



One other species ; found in Bermuda. 



BiBL. Ehr. Ber. Brl. Ak. 1844, 264; 

 Kiitz. Sp. Alq. 126 ; I'ritchard, Infus. 832. 



SYZYGITES, Ehrenbercr (see Phyco- 

 MYCES). — A genus of Mucorini (Phycomy- 

 cetous Fungi), containing two species, a 

 kind of mould growing over decaying 

 Agarics, remarkable among all the class to 

 which they belong for the occurrence of the 



phenomenon of conjugation of the branches 

 as a preliminary to the formation of tho 

 spores. Ehrenbtsrg discovered the conju- 

 gation in *S'. megalocarpus many years ago. 

 The young filaments are simple, slender, 

 rather rigid, pellucid and straight, — soon 

 becoming forked, thickish, wliitish yellow 

 (somewhat olive when dry). The rudi- 

 ments of the peridioles spring out as papillas 

 from the branches, becoming pear-shaped ; 

 and when two come into contact, they coliere, 

 and become confluent into a fusiform body. 

 The contents of the filaments next ascend 

 and accumulate in the peridiole, at length 

 forming a black globule (sporange?). While 

 this is ripening, the apices grow out into 

 long simple filaments. 



Fig. 716. 



Syzygites megalocarpus. 



A branched filament, exhibiting the conjugation in 

 various stages. 



Magnified 200 diameters. 



BiBL. Ehrenb. Verhandl. Naturf. Freund. 

 Berlin, i. p. 91 ; Fries, Syst. Mtjc. iii. p. 329 ; 

 Berkeley, Ann. Nat. Hist. i. p. 259; Van 

 Tiegh. Ann. d. Sci. Nat. 1873. 



T. 



TABELLARIA, Ehr.— A genus of Dia- 

 tomaceae. 



Char. Frustules tabular, attached, at first 

 united into a filament, subsequently cohe- 

 ring only by the angles, with longitudinal 

 vittae interrupted in the middle ; valves 

 inflated in the middle and at each end, 

 striated ; freshwater. 



T. focculosa (PI. 17. fig. 27 a, h). Septa 

 3-5 on each margin. Length 1-960 to 

 1-840". 



T. fenestrata. Frustules oblong ; vittae 

 two, opposite. Length 1-600 to 1-290", 



