912 



SYSTEMATIC HISTORY OF THE INTFSOEIA. 



linear, nearly reaching the maroiu. EA. 

 pi. 1. 2. f/l2«; si), i. p. 60, pi. 19. 

 f. 191. America, Australia, (xii. 16.) 



S. exilis (K.). — Very minute, ventri- 

 cose, shortly rostrate ; stauros linear. 

 KB. p. 105, pi. 30. f. 21. Trinidad. 

 1-2400". 



S. imndata (K.). — Small, ventricose, 

 with rostrate apices, and 27 radiant 

 pimctate strise in -001" ; stauros linear, 

 abbreviated. KB. p. 106, pi. 21. f. 9 ^ 

 SB. i. p. 61, pi. 19. f. 189. Britain. 

 Fossil, Santa Fiore. 



S. anccp8 (E.). — SmaU, lanceolate, 

 constricted beneath the subcapitate 

 apices j stauros linear, not reaching- the 

 margin ; striae very delicate, 45 in -001". 

 EA. p. 134, pi. 2.1. f. 18; SB. i. p. 60, 

 pi. 19. f. 190. Europe, Asia, Africa, 

 America. 



S. Crucicula (S.). — Small, elliptic- 

 lanceolate, somewhat ventricose, pro- 

 duced at the ends into minute, conical 

 beaks; stauros very narrow, linear, 

 reaching the margin. SB. i. p. 60, pi. 19. 

 f. 192. Marine. Ireland, (vii. 64.) 



S. ventricosa (K.). — Very minute, 

 ventricose, constricted beneath the capi- 

 tate apices ; stauros linear, not reaching 

 the margin. I^. p. 105, pi. 30. f. 27. 

 Germany, France, Britain. 



S. capitata (E.). — Very small, oblong, 

 twice as long as broad, suddenly con- 

 stricted beneath the capitate apices; 

 stiia3 18 in 1-1560". EB. 1844. Southern 

 Ocean. Front ^dew linear. 1-1152". 



S. phyUocles (E.). — Turgid-lanceolate, 

 with the apices produced into short, 

 subacute beaks ; staiu^os linear, reaching 

 the margin. EA. p. 135, pi. 1. 2. f. lO". 

 America, China, (xii. 7-9.) 



S. Semen, EM. pis. 35 a, and 38 a. 

 many figures. Ehrenberg gives about 

 80 habitats in Asia, Africa, and Ame- 

 rica. Lateral view small, ventricose, 

 with mammiform apices and linear 

 stauros. 



S. Tmcula (E.). — Small, striated, 

 elliptic-oblong; apices suddenly con- 

 tracted, umbonate ; stauros linear, reach- 

 ing the margin ; strise oblique. = Navicula 

 Tusmla, EB. 1840, p. 21 ; KA. p. 77 ; 

 Staiiroptera Tuscida, EM. pi. 6. 1. f. 13. 

 Fossil. Santa Fiore, Siberia. Front 

 view linear. 



S. mesopacJiya, EM. pi. 15 a. f. 26. 

 Lough Mourne deposit. Large, oblong- 

 lanceolate, suddenly contracted into mam- 

 mifonn, obtuse apices ; stauros linear. 



S. hirostris (E.). — Small, narrow- 

 lanceolate, with produced, rostrate, sub- 

 acute apices ; stauros linear. EA. p. 134, 



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



S. Platalea (E.). — Lateral view slender 

 lanceolate^ constricted beneath the capi- 

 tate apices ; stam-os linear. EM. pi. \bK.% 

 f. 30. Lough Mourne deposit ; Mexico. 



S. SiehokUi (E.). — Large, turgid- 

 lanceolate, tapering into obtuse beaks; 

 stauros linear. EM. pi. 34. 8. f. 12. 

 Japan. 



S. Ehrenherc/ii (E.). — Small, inflated, 

 oval, with produced, mammiform apices ; 

 stauros linear; striae parallel. = Stau- 

 roptera platystoma, EM. pi. 14. f. 13. 

 Berlin. 



S. platy stoma (E., K.). — Linear-ob- 

 long, contracted at the ends into mammi- 

 form beaks ; stauros linear. JOB. p. 105, 

 pi. 3. f. 58; EM. pi. 3. 1. f. S.=Navicula 

 platystoma, E Inf. pi. 13. f. 8. Germany, 

 America, Asia. (ix. 142.) 1-1100" to 

 1-240". 



S. ampliicephala (K.). — Linear-oblong, 

 with produced, rostrate, capitate apices ; 

 stauros linear. KB. p. 105, pi. 30. f. 25. 

 Germany, France. 



S. linearis (E.). — Minute, linear-ob- 

 long, with parallel marginal lines, at- 

 tenuated at the apices into somewhat 

 obtuse beaks ; stam*os linear. EA. p. 135, 

 pi. 1. 2. f. 11. America, Em'ope. Lough 

 Mourne deposit. 



S. macrocephala (K.). — Linear, slen- 

 der, constricted beneath the capitate 

 apices ; transverse strise very dense. 

 KA. p. 92. = Stauroptera macrocephala, 

 Rab B. p. 49. France. 1-425". 



S. 2jlatycep)hala = Staiiroptera platyce- 

 phala, EM. pi. 17. 2. f. 9. Fossil. Fin- 

 land. Linear, suddenly constricted be- 

 neath the dilated, broadly rounded ends ; 

 stauros linear, reaching the margin; 

 striae parallel. 



S. excellens (Perty). — Striated, broadly 

 linear, suddenly contracted into broadly 

 rounded, mammifonn beaks. Pertv, Inf. 

 p. 205, t. 17. f. 11. Alps. Form and 

 size of S. jjlatystoma, but striated. Its 

 nearest ally is S. microstaiiron, E. ; but it 

 is larger and somewhat broader, with 

 less broadly roimded ends. 



S. microstaiiron (E., K.). — Striated, 

 linear, suddenly constricted beneath the 

 broadly rounded, subcapitate apices; 

 stauros linear. KB. p. 106, pi. 29. f. 13. 

 = Staiiroptera microstanron, EA. pi. 1. 4. 

 f. 1. Asia, Africa, America. 



S. monoyramma (E.). — Oblong", turgid 

 at the middle, and conti'acted at each 

 end into a broad, rounded, conical beak. 

 EA. p. 135; IvB. p. 105, pi. 29. f. 18. 

 Surinam. Eesembles Achianthes ven- 

 tricosa. 



