798 



SYSTEMATIC HISTORY OF THE INFUSORIA. 



short, teetli-like marginal costse. Hass. 

 Br. Algae, p. 439, pi. 102. f. 15. Aquatic. 

 Sussex. Dr. Hassall describes it as a 

 very distinct species, having no relation 

 with S. biseriata. 



S. amhigua (K.). — Broadly oblong, 

 with truncated ends, and 4 straight, ob- 

 solete, rather broad transverse striae in 

 1-1200". KB. t. 5. f. 17. Stagnant waters, 

 Switzerland. 1-264". Kiitzing's figure 

 apparently represents the front view, and 

 is broadly linear, with obscure transverse 

 costfB, leaving a narrow median portion. 



S. Icevis (K.)- — Cylindrical, elliptic- 

 lanceolate, somewhat obtuse, very smooth 

 and h valine. KS A. p. 36. Marine. France. 

 1-1080". 



S. attenuata (Nag.). — Smooth, linear- 

 lanceolate, with gradually attenuated 

 apices. KSA. p. 889. Switzerland. 

 1-240". Perhaps a Tryblionella ? 



S. ? ornata (K.). — Elongate, pestle- 

 shaped, truncate at each end, with obtuse 

 angles, longitudinally dividuate, and or- 

 namented with minute puncta disposed 

 in decussating lines. KB. t. 3. f. 54. 

 Marine. Genoa. Length 1-280"; breadth 

 1-960". Kiitzing's figure is linear-oblong 

 with truncate ends, and seems to repre- 

 sent the front view, in which the striated 

 lateral portions approach so closely at 

 the centre that the smooth median por- 

 tion is visible only near the ends. Surely 

 this is not a Smirella ? 



S. ? Amphihola (E.). — Broadly linear, 

 with cuneate, subacute ends, and 15 striae 

 in 1-200" ; front view with obtuse ends. 

 ERBA. 1854, p. 271. Kurdistan. 1-324". 

 Has the general form of Tryhlionella 

 Reyiila. Ehrenberg remarks that he is 

 not sure to what genus this belongs ; he 

 has sometimes fancied there was an um- 

 bilicus, as in Pinnularia, but its equal 

 transverse striae on each side render its 

 form singular. 



S. Sicula (E.). — Smooth, broadly na- 

 vicidar, with subacute ends and longi- 

 tudinal marginal lines. EM. pi. 22. f. 58. 

 Fossil. SicUy. 1-528". 



S. Uolepta (E.). — Styliform, fom' times 

 as long as broad, with obtuse ends and 

 no median line ; the narrow margin finely 

 striated. KSA. p. 36. Maritime. India. 

 1-360". 



_ S. ? linea (E.). — Bacillar, stout, one 

 side cuneate at each end, the other 

 rounded, finely transversely striated 

 throughout. ERBA. 1843, p.* 271. Ne- 

 therlands. 1-240". 



S. Stylus (E.). — Large, stjdiform and 

 narrow, quadrangular ; one end more 

 obtuse than the other, but neither acute ; 

 costa 54 in 1-144". ERBA. 1843, p. 271. 

 Near Weimar. 1-144". 



S. rhopala, EM. pi. 33. 1. f. 19. Egypt. 

 Elirenberg's figures show the front view 

 large, longly cmieate with rounded ends, 

 and numerous fine transverse striae at 

 each side, separated by a narrow smooth 

 median portion with two puncta at each 

 end. 



S. aspera (E.). — Large, with four or 

 five loosely disposed costae in 1-1152", 

 with rough crests. KSA. p. 39. Volcanic 

 earth, Hochsimmer on the Rhine. This 

 species, named from a fragment, Ehren- 

 berg states is perhaps a Campylodiscus. 



S. Australis (E.). — A fragment of a 

 linear species with six, straight trans- 

 verse striae in 1-1200". Africa. Another 

 species constituted by Ehrenberg's ob- 

 jectionable practice of naming isolated 

 fragments. 



S.? lmnprophylla(E.), S. Uralensis(E.)^ 

 Ural Mountains; S. Sibirica (E.), Sibe- 

 ria ; S. ? curimla (E. ), India, Mexico ; S. 

 Stella (E.), Maritime : India, Africa ; S. 

 Nicobarica (E.), Nicobar; S. compta (E.), 

 Eo-^^t ; S. Zambeze (E.), River Zambeze ; 

 S^Platalea (E.), Senegal; S. Cafra (E.), 

 S. Capensis (E.), S. clathrata (E.), Cape 

 of Good Hope ; S. Falklandica (E.), S. 

 Meluinensis(K.),S.Insidani7n (E.), Falk- 

 land Islands; S. Araucania (E.), Arau- 

 cania; S. ampMcentra (E.), S. holosticha 

 (E.), S. insecta (E.), S. leptotera (E.), 

 S. Polyodon (E.), Mexico. 



Genus CAMPYLODISCUS (E., Men.).— Valves equidistant, frustules soli- 

 tary, disciform ; disk tortuous or saddle-shaped, rotimdato- elliptic, costate, 

 costae mostly radiate. Camjjylodiscus has the lateral surfaces still more 

 developed than they are in the Melosireae, whilst the central or interstitial 

 portion is reduced to a narrow ring, — a circumstance which renders it very 

 difficult to obtain a satisfactory front view. In these respects it approaches 

 the Coscinodisceae. Kiitzing referred to Surirella several species now placed 

 in this genus. Meneghini suggested their removal to Campylodiscus, in these 

 terms — ^' One really is at a loss to find the motive that could induce Kiitzing 

 to separate this generically from Campylodiscus ; " and Professor Smith has, 



