SYNURA. 



[ 626 ] 



SYZYGITES. 



smaller ones consist almost entii-ely of epi- 

 thelial cells or of areolar tissue. 



Fig. 720. 



d-ms- 



^' 



^ 





i3- 



From the synovial membrane of a finger-joint. 



A. Two appendages of the synovial processes, a, areo- 

 lar tissue in its axis ; b, epithelium of the free margin ; 



c, that continuous with the epithelium of the processes ; 



d, cartilage-cells. 



Magnified 250 diameters. 



B. Four epithelial cells from the synovial membrane 

 of the knee-joint, one of them with two nuclei. 



Magnified 350 diameters. 



BiBL. Kblliker, Mikrosk. Anat. i. 322. 



SYNURA, Ehr. — A supposed genus of 

 Volvocineae (Confervoid Algaj), described as 

 consisting of a number of oblong corpuscles 

 attached together by their prolonged filiform 

 posterior extremities in the form of a globe, 

 the whole enclosed in a gelatinous sphere (or a 

 membrane ?) ; the corpuscles are said to have 

 only one "flagelliform filament" (cilium), 

 and no " eye-spot." In S. Uvella the cor- 

 puscles are yellowish, the "tails" three times 

 as long as the bodies. Diameter of globes 

 1-290 to 1-190". See Volvox. 



BiBL. Ehrenberg, Infus. p. 6. 



SYRINGIDIUM, Ehr.— A genus of Dia- 

 tomacese. 



Char. Frustules single, cylindrical; valves 

 dissimilar, kept apart by a turgid ring(hooi3?). 

 Marine. 



S. bicorne. Frustules oblong, smooth, not 

 striated (ord. ilium.), turgid in the middle, 

 one end attenuate, with two slight constric- 

 tions, and acuminate, the other subglobose, 

 turgid, and with two horns. Length l-S/O". 

 Coast of Africa. 



BiBL. Ehrenberg, Ber. d. Berl. Akad. 

 1845. 365; Kiitzing, Sj). Alg. 32. 



SYSTEPHANIA, Ehr.— A genus of Dia- 

 tomaceae. 



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 mar- 

 gin). Fossil. 



Three species ; found in Bermuda. 



BiBL. Ehrenberg, Ber. d. Berl. Akad. 

 1844. 264; Kiitzing, Sp. Alg. 126. 



SYZYGITES, Ehrenberg.— A genus of 

 Mucorini (Physomycetous Fungi), contain- 

 ing one species, a kind of mould growing 

 over decaying Agarics, remarkable among 

 all the class to which it belongs for the oc- 

 currence of the phsenomenon of conjugation 

 of its branches as a preliminary to the for- 

 mation of the spores. The only species is 

 S. megalocarpus, in which the conjugation 

 was discovered by Ehrenberg many years 

 ago. The young filaments are simple, slen- 



Syzygites megalocarpus. 



A branched filament, exhibiting the conjugation in 



various stages. 



Magnified 200 diameters. 



der, rather rigid, pellucid and straight, soon 

 becoming forked, thickish, whitish-yellow 

 (somewhat olive when dry). The rudiments 

 of the peridioles spring out as papillae from 

 the branches, becoming pear-shaped, and 

 when two come in contact, they cohere, and 

 become confluent into a fusiform body. The 



