SPIROGYRA. 



[ 717 ] 



SPIRORBIS. 



witli the zoospore-like bodies just described 

 (see PYTunjM). 



The species of Spirof/i/ra have been 

 p-eatly multiplied by author.*. The pecu- 

 liar fold projecting from the septum appears 

 to us to depend upon age and activity of 

 growth ; and the length of the joints de- 

 pends greatly on the stage of growth, as 

 they continually divide into two equal parts. 



Spiral band single. 



S. tenuissima. Vegetating filaments 1-3000" 

 in diam. ; joints four or live times as long 

 as broad ; spiral band open ; spore oblong- 

 elUptical (Hassall, pi. 32. figs. 9, 10). 



S. Ivmiata. Filaments about 1-1000" in 

 diam. ; joints six or eight times as long ; 

 spiral lax, spores oblong-elliptical (Hass. 

 pi. 31. fig. 394). 



*S. injlata (S. (/astroides, Kiitz.). Fila- 

 ments 1-1680" in diam. ; joints four or five 

 times as long ; turns of spiral about five ; 

 fertile cells ventricose ; spores oblong- 

 eUiptical (Hass. pi. 32. figs. 6, 7). 



<S'. commttnis (fig. 668). Filaments 1-1440 

 to 1-2000" in diam. ; joints two or three 

 times as long ; turns of spiral four, broad ; 

 spores elliptical (Hass. pi. 28. figs. .5, 0). 



S. quinina (PL 9. fig. 17). Filaments 

 1-600" in diam. ; joints once and a half or 

 twice as long ; tiu-ns of spiral broad and 

 dense ; spores elliptical (Hass. pi. 28. fig. 2). 

 Varies in the length of the joints, which are 

 sometimes twice to seven times as long. 



Spiral bands two. 



S. decimina. Filaments 1-720" in diam. ; 

 joints two to fom- times as long; spiral 

 bands lax, crossing so as to present the 

 appearance of the letter X (Hass. pi. 23. 

 figs. 3, 4). 



S. elongata. Filaments 1-1320 to 1-1200" 

 iu diam.; joints ten times as long; bands 

 lax (Berkeley, Gleanings, 12, fig. 2). 



Spiral bands numerous. 



S. nitida (PL 9. fig. 26). Filaments 

 1-360' ' in diam. ; j oints twice or three times 

 as long ; bauds fom-, dense, closely veiled ; 

 spores elliptical (Hass. pi. 22. figs. 1, 2). 



S. maxima. Filaments 1-200 to 1-300" 

 in diam. ; joints equal, once and a half or 

 twice as long ; bands lax : spores globular 

 (Hass. pk. 18, 19). 



S. bellis. Filaments 1-400"; joints equal 

 or twice as long ; bands two or three, lax ; 

 spores roimded; var. /3, spirals condensed 

 (Hass. pi. 24). 



S. pellucida (PL 9. fig. 27). Filaments 

 1-840" in diam. ; joints four or six times as 

 long ; bands lax and slender ; fertile cells 

 ventricose ; spores globose (Ilass. pi. 2.5). 



S. rimdaris. Filaments 1-2040" in diam. ; 

 joints three or four times as long; spiral 

 bands four, broad, dense (Hass. pi. 27). 



<S'. curvatum (Sirogonimn stictituni and 

 breviarticulatum, Kiitz.). Filaments 1-720" 

 in diam, ; joints four or five times as long ; 

 bands three or four, slender; conjugation 

 dii'ect, without a cross branch, approaching 

 Mougeotia. (Hass, pi. 26. figs. 1, 2.) 



BiBL. Hassall, Alg. 135 ; Kiitzing, Sj). 

 Aig. 437, Tab. Phyc. v, ; Pringsh. Flora, 

 XXXV. 465, Ann. N. H. 2. xi. 210; Brauu, 

 Verjiingimg, Hay Soc. ; Vaucher, Conferves, 

 37 ; Agardh, Ann. Sc. Nat. 2. vi." 197 ; 

 Rabenh. Ah/, iii. 232 ; Carter, Ann. N. II. 

 1880, vi. 207 ; Petit, Srnrog. of Paris, 

 1881. 



SPIROLI'NA, Lamk. (Spirulina, Ehr.). 

 — -Restricted. The long, narrow, crozier- 

 like modifications of Peneroplis (P. (Sp.) 

 austriaca, PL 23. fig. 12) come under this 

 title. Fossil and recent. 



BiBL, D'Orb. For. Foss. Vien. 137 ; Car- 

 penter, Phil. Tr. 1859, 10 ; Parker, Jones, 

 and Brady, Ann. N. H. 3. xv. 230. 



SPIROLOCULI'NA, D'Orb, — A sub- 

 genus of Miliola, among the Porcellaneous 

 Foraminifera, 



Clucr. Shell regular, equilateral, com- 

 pressed, oblong, oval, or elongated ; cham- 

 bers concentric on two opposing faces, in the 

 same plane, not embracing, all apparent and 

 with simple cavities ; orijice single, situated 

 alternately at the two ends of the longitu- 

 dinal axis, simple or with a tooth, frequently 

 prolonged into a tube. 



Sp. planalata (PL 23. fig. 7). Many 

 species, recent and fossil. 



BiBL. D'Orb. Ann. Sc. Nat. vii. 298; 

 Williamson, Rec. For. 82 ; Carpenter, For. 

 77 ; Parker, Jones, and Brady, Ann. N. H. 

 4. viii. 248. 



SPIROM'OXAS, Perty.— A genus of 

 Flagellate Infusoria. 



Char. Body leaf-like, compressed, rounded 

 at both ends, and loUed spirally ; with one 

 or two flagella. 



S. vohibilis=Cycliditim distortum, Duj. 

 Kent describes other species, (Pertj'-, 

 Lebensf. 171 ; Kent, Inf. 297.) 



SPIROPLEC'TA, Ein-. See Textulaeia. 



SPIROR'BIS, Daudin, Lamk,— A genus 

 of AnniUata, order Setigera, 



The elegant little milk-white flat spiral 



