742 



SYSTEMATIC HISTORY OF THE INFUSORIA. 



I 



short, usually coloiu'less, sides somewhat 

 concave. Sporangium orbicular, beset 

 with spines ultimately branched at the 

 apex. L. 1-1275" to 1-972" ; B. 1-948" 

 to 1-697". =Desmidium hexaceros (Ehr.). 

 Phycastrum tricorne (Kg.), P. trilohatum 

 'Kg.) ? P. hexaceros (Kg.) ?, P. Rcdfsii 

 Nag,), P. cremdatum (Nag. in part). 

 " B., I, R, G., U.S.A. 



S. cyrtocerum (Breb.). — Segments in 

 f. V. suhcimeate, gradually wddening up- 

 wards, truncate at the end margin, 

 rough with minute granules, the lateral 

 processes incurved, di\dded at the apex ; 

 e.v. triradiate, processes short, cm-ved, 

 sides slightly concave. L. 1-800" ; B. 

 1-500" . = Phycastru7n cyrtocerum (Kg.). 

 G.B., I., R, U.S.A. 



S, injlexum (Breb.). — Segments in f.v. 

 broadly elliptic, it^ner and outer margin 

 turgid, rough with minute granules, 

 lateral processes incurved, short, divided 

 at the apex; e.v. tri- or quadriradiate, 

 processes short, sides concave. F. 



S. hrachycerum (Breb.). — Segments in 

 f.v. ovato-lunate, inner margin turgid, 

 outer equally rounded, rough all over with 

 minute granules, and on the outer mar- 

 gin very rough with minute, acute, short, 

 almost spine-like granules ; lateral pro- 

 cesses incm^ed, divided at the apex ; 

 e. V. triradiate, processes short, straight, 

 sides somewhat concave. F. 



S. pohpnorphum (Breb.). — Segments 

 in f.v. broadly elliptic or almost circidar, 

 rough with minute gTanules (sometimes 

 with a few minute scattered spines), 

 processes short, stout, tipped by three or 

 four divergent spines; e.v. with three, 

 fom*, five, or six angles, each produced 

 into a short stout process. Sporangium 

 orbicular, beset with elongate spines, 

 forked or branched at the apex. L. 

 1-1000" ; B. 1-1157". (ii. 20, 21, 24, 25, 

 & 31.) G.B., I., R, U.S.A. 



S. gracile (Ralfs). — Segments in f.v. 

 triangular, ends truncate, rough Tvdth 

 minute granules, tapering at each side 

 into elongate, straight, slender, horizontal 

 processes, terminated by three or four 

 minute spines ; e.v. triradiate, processes 

 straight, sides concave. L. 1-773" to 

 1-539"; B. 1-348" to 1-372". (m. 28, 

 e.v. 29.) = Goniocystis (Trigonocystis) 

 gracilis (Hass.), Phycastrum gracile 

 (Kg.). G.B.,L,R 



S. paradoxum (Meyen). — Segments 

 in f.v. gradually icidening upwards, the 

 ends truncate, rough with minute gra- 

 nules, processes straight, elongate, slen- 

 der, divergent, trifid at the apex ; e.v. 

 tri- or quadriradiate, processes straight, 



sides straight or very slightly concave. 

 L. 1-941" ; B. 1-1165". = Phycastrum 

 paradoximi (Kg.), Goniocystis {S.) para- 

 doxmti (Hass.). G.B., I., F., G., Italy, 

 U.S.A. .... J, 



3t Segments furnished with variously 

 disposed spines, which are either sim- 

 ple, or short and notched at the apex. 



^.ptroboscideum (Breb.). — Segments in 

 f.v. broadly cuneiform, ends somewhat 

 convex, rough with very minute, shortj 

 truncate spines, chiefly conflned to the 

 outer margin, processes short, thick, trifid 

 at the apex ; e. v. triradiate ; processes 

 short, stout, sides concave. L. 1-555" ; 

 B. 1-500". =aS'. «67?m««, /3 (Ralfs, Breb.). 

 G.B., I., R 



S. controversu7n (Breb.). — Segments in 

 f.v. elliptic or broadly fusiform, some- 

 times irregular, fm'nished with scattered, 

 irregular, simple or notched spines; pro- 

 cesses short, generally curved, spimdose, 

 terminated by minute spines ; e. v. tri- 

 radiate, the processes ttvisted or curved. 

 Sporangium orbicular, spinous ; spines 

 t^dce branched. L. 1-972" ; B. 1-886". 

 Goniocystis {Trigonocystis?) aculeatum 

 (Hass.). G.B., I., F. 



S. aculeatum (Menegh.). — Segments 

 in f.v. broadly fusiform, furnished with 

 thicMy scattered simple or notched spines ; 

 processes elongate, spinulose, straight, ter- 

 minated by minute spines; e.v. 3-5- 

 radiate, the processes straight, sides con- 

 cave. L. 1-666" ; B. 1-500"". = Desm idium 

 aculeatum (Eh.), Phycastrum aculeatum 

 (Kg.), Goniocystis {Trigonocystis) acidea- 

 tum (Hass.). G.B., I., R, G., Italy. 



S. vestitum (Ralfs). — Segments in f v. 

 fusiform, older margin bordered by minute 

 emarginate spines ; processes elongate, 

 rough, terminated by minute spines; 

 e.v. triradiate, the processes elongate 

 straight, sides concave, furnished at the 

 middle ivith a pair of conspicuous slender 

 forked sp)ines, sometimes accompanied by 

 a few others shorter either simple or 

 notched. L. 1-625" ; B. 1-384". (in. 30, 

 e. V. 31.) G.B., I., R 



S. oxyacantha (Archer). — Segments in 

 f.v. broadly fusiform, rough with minute 

 granules, fiu'nished o)i the older margin 

 with six subulate acute depressed spines 

 (fom- of which are apparent in this view); 

 processes elongate, incurved, the granides 

 thereon arranged in transverse lines, ter- 

 minated by three or four minute spines ; 

 e. V. ti'ira&iate, the processes elongate 

 straight, sides somewhat concave, end 

 furnished at the middle with a pair of 

 very slender extremely acute subulate 



