914 



SYSTEMATIC HISTORY OF THE INFUSORIA. 



S. truncata (Eab.)- — Minute, oblong- 

 lanceolate, with very obtuse apices ; 

 staiu'os linear; stride distinct, oblique, 

 14 or 15 in l-l'200". = Stauro2)tera trun- 

 cata, Rab D. p. 49, pi. 9. f. 12. Bosnia. 



S. acrocephala (Rab.). — Broadl}^ lan- 

 ceolate ; tiu'gid at the middle, rapidly 

 tapering to the acute apices; stauros 

 dilated outwards, reaching the margin ; 

 strife punctate, parallel. Rab D. p. 48, 

 pi. 9. f. 19. Saxony. 



S. acuta (S.). — Elongated slender- 

 lanceolate or rhomboid, tapering to the 

 subacute apices ; stauros conspicuously 

 dilated outwards, reaching the margin ; 

 strife oblique, 30 in -001". SD. i. p. 59, 

 pi. 19. f. 187. Britain, (vii. 76.) 



S. pulchella (S.). — Lanceolate, or 

 linear-lanceolate ; stauros conspicuously 

 dilated outwards, reaching the margin ; 

 stride oblique, very distinct, punctate, 

 80 in -001". SD. i. p. 61, pi. 19. f. 194. 

 Marine. Britain. (vii. 77.). Front 

 view broad, linear-oblong, with rounded 

 angles and constricted centre. 



S. asjm-a (E., K.). — Turgid, lanceo- 

 late or linear-lanceolate, with subacute 

 apices ; striae oblique, punctate-asperate ; 

 stam'os abbreviated, dilated outwards. 

 KB. p. \0Q. = 8tauroptera aspera, EA. 

 p. 134, pi. 1. 1. f. 12 ; BC. vii. pi. 1. f. 18. 

 America, Europe. Front view linear, 

 with trmicate ends. 



2t Valves oval or oblong. 



S. Fenestra (E.). — Small, elliptic-ob- 

 long, with parallel marginal lines, and 

 obtuse, cmieate apices. EA. pi. 2. 1. 

 f. 20. America, Japan. 



S. Peckii (Rab.). — Small, oval, with 

 rounded ends; costse stout, 11 or 12 in 

 1-1200"; stauros linear, reaching the 

 margin. = Stauroptera Peckii, Rab D. 

 p. 49, pi. 9. f. 18. Lusatia. 



S. pohjfframtna (E.). — Elliptic-oblong, 

 with rounded ends and longitudinal 

 dotted lines ; stauros abbreviated. EA. 

 p. 185, pi. 2. 6. f. 80. Cuba. 



S. semicruciata (E.). — Very large, re- 

 sembling Navicula viriclis, but having the 

 crucial umbilicus of Stauroneis. = *Sf«?/- 

 roptera semicruciata. EB. 1843, p. 45. 

 Asia. 



3t Valves linear. 



S. dendrohates (E.). — Narrow-linear, 

 with obtuse ends, and a densely and 

 obliquely striated border: front view 

 oblong-quadrate. = Stauroptera dendro- 

 hates, E. Under moss on trees. America. 

 1-490". 



S. Roraim(7> = Staurojytera Roraimcp., 



EM. pi. 34. 5 a. f. 9. Linear, with cu- 

 neate ends, a transverse median line, and 

 parallel striae. 



S. ohlonga (Bail.). — Linear, with acute, 

 cuneate ends, and oblique punctato-as- 

 perate striae ; stauros abbreviated, dilated 

 outwards. = Stauroptera ohlonga, BC. vii. 

 p. 10, pi. 1. f. 17. America. The size 

 and markings of Stauroptera aspera, 

 E., but having its valves oblong, with 

 parallel sides, and acute angular ends, 

 Bailey. 



S. Isostauron (E., K.). — Elongated, 

 linear, with broadly rounded, slightly 

 attenuated ends ; stauros linear, reaching 

 the margin ; striae parallel. KB. p. 106. 

 = Stauroptera Isostauron, EA. p. 135 ; 

 EM. pi. 16. 1. f. 7. Labrador, Sweden, 

 Finland, (xii. 73.) 



S. Liostauron (E.). — Styliform, linear- 

 oblong, with scarcely attenuated, rounded 

 apices ; stauros linear. EA. p. 135 ; 

 EM. pi. 5. 1. f. 16. Iceland. 



Douhtful Species. 



S. ? explicata (Perty). — Small, not 

 striated, with rounded ends, and much 

 inflated centre (cruciform) ; enlarge- 

 ments acute. Perty Inf. p. 205, pi. 17. 

 f. 10, Alps. About the size of S. ren- 

 tricosum, K., but stiU more inflated at 

 the middle, and the inflations pointed, 

 not romided, Perty. The figm-e has no 

 median line or other markings, and re- 

 sembles a Biblarimn rather than a Stau- 

 roneis. 



S. mesogongyla (E.). — Lateral view 

 linear, with rounded ends and gibbous 

 centre; transverse striae parallel, inter- 

 rupted by a transverse central band. 

 Probably a Navicula, since tlie figure 

 shows a small, definite central nodule. 

 EM. pi. 6. 1. f. 7. Guiana. Fossil, San 

 Fiore. 



S. gibha (E., K.). — Form of Navicula 

 gihha, but furnished with an imperfect 

 transverse fascia. KB. p. 107, pi. 29. 

 f. 24. = Stauroptera ? gibha, EA. p. 135, 

 pi. 1. 2. f. 3. America, Africa. The 

 figure represents a Navicula with the 

 striae shorter opposite the dilated um- 

 bilical space. 



S. paucicostata (Rab.). — Small, linear, 

 with inflated centre, and dilated, rounded 

 apices ; costae distant, 4 or 5 in 1-1200", 

 much inclined. = Stauroptera pauci- 

 costata, Rab D. p. 49, pi. 9. f. 15. Eu- 

 rope. The figure shows a rhomboid 

 umbilical space resembling the dilated 

 nodule seen in many Naviculae, but not 

 a true stauros. 



S. maculata (Bail.). — Oval, with 



