OF THE SUEIEELLE^. 



789 



united in flabellate or radiating bundles, 

 Sm. 



S. barbatula (K.). — Minute, tabulate ; 

 £i*ont view linear, truncate, watli a ter- 

 minal mucous appendage ; valves elliptic- 

 lanceolate. KJB. p. 68, t. 15. f. 10. 4. 

 Marine. Eui'ope. 1-9G0". 



S. truncata (Grev.). — Frustules united 

 in tablets, obscm-ely stipitate ; front 

 view linear, trimcate ; valves lanceolate, 

 obtuse. =Z>iW,07«a and Exilaria truncata, 

 Grev. ; Exilaria fasciculata, Hass. ; 

 Synedra fasciculata, SBD. i. p. 73, pi. 11. 

 f. 100. Fresh water. Europe. Striae 

 40 in -001", Sm. 



S. Areas (K.). — Frustides flabellate, 

 attached to a cushion-like stipes ; front 

 view curved ; valves lanceolate, with 30 

 marginal striae in -001. KB. p. 68, t. 30. 

 f. 50 ; SBD. i. p. 73, f. 98. (iv. 27.) 

 Marine. Europe and America. 



2 1 Frustules on an elongated, often 

 branched, stipes. 



S. Ehrenhergii (K.). — Frustules at- 

 tenuated near the obtuse apices, teiminal 

 on a long, linear stipes. KB. p. 69, 1. 11. 

 f. 6. Fresh water. Berlin. 



S. Saxonica (K.). — Stipes a little elon- 

 gated; frustules slender; front view 

 linear, trimcate ; valves narrow lanceo- 

 late. KB. p. 68, t. 15. f. 14. Salt Lake 

 at Mansfeld. 1-330". 



S.fulffens (Grev., S.). — Frustules ter- 

 minal on a thick, branched stipes, ge- 

 minate linear, trimcate ; valves linear, 

 inflated at centre and ends ; striae 36 in 

 •001". SBD. i. p. 74, pi. 12. f. 103.= 

 Exilaria fulgens, Grev. ; Licmophora 

 fulgens, KB. 1. 13. f. 5. Marine. Europe 

 and America. 6^111 .^o) 



S. crystallina (Ag., K.). — Frustules 

 very large, on a thickish abbreviated 

 stipes; valves linear, inflated at centre 

 and apices ; strife distinct, 26 in -001". 

 KB. p. 69, 1. 16. f. 1 ; SBD. pi. 12. f. 101. 

 = Diatoma crystallina, Ag. Marine. 

 Europe. 1-60" to 1-48". 



S. superha (K.). — Stipes somewhat 

 elongated; valves stout, linear-lanceo- 

 late, with rounded ends ; striae verv di- 

 stinct, 27 in -001". KB. p. 69, t. 15. 

 f. 13. SBD. i. p. 74, pi. 12. f. 102. 

 Marine. Em'ope. 



S. Dalmatica (K.). — Stipes somewhat 



elongated and branched ; frustides large, 

 linear, slightly and gradually attenu- 

 ated at the subtruncate ends. KB. 

 p. 69, t. 12. f. 2. Marine. Adriatic Se^. 

 Frustides terminal on the branches. 

 1-240". 



S. rohusta, n. s. — Frustules linear ; 

 valves elliptical, ends roimded. Striae 

 20 in -001", interrupted by three equi- 

 distant longitudinal lines. -0120" to 

 •0175''. Algae, Corsica, (vin. 3.) 



S. giyantea (Lobarz.). — Frustides very 

 long, delicate, somewhat twisted, linear, 

 truncate ; valves very narrow, with di- 

 lated, obovate apices. Lobarzewsky, 

 Limisea, 1840, p. 276, t. 6 ; KSA. p. 48. 

 Marine. Dalmatia. 



7 * Frustules connected in tablets, at 

 length separating, and adhering by 

 alternate angles, as in Diatoma. 



S. rumpens (Kiitz.), — Tablets affixed ; 

 frustules very narrow linear, with tumid 

 obtuse apices, adhering by alternate 

 angles. KB. p. 69, 1. 16. f. 6. Brackish 

 water. German coast. 



Doubtful species from Ehrenherg. 



S. australis. — Linear, sti-iated, with 

 attenuated, obtuse apices in both views. 

 ERBA. 1840; Microg. pi. 1. 1. f. 3. In 

 siliceous schist from the Philippine 

 Islands. 1-432". 



S. j3rt/(Y/cea. — Very narrow, smooth, 

 with subacute apices. EM. pi. 1. 1. f. 1. 

 With the last. 1-480". 



S. iticurva. — Linear, very narrow, 

 flexuose, smooth, round, or equally 

 quadrangidar. ERBA. 1844, p. 272. 

 Bermuda. 1-288". Perhaps a Spongo- 

 lithis. 



S. rostrata (EM. pi. 9.1. f.4, and pi. 14. 

 f, 44^. — Fossil. France and Germany. 

 Valves elongated, slender, linear, with 

 contracted, conic apices, and transverse 

 striae. 



S. elegans, Asia ; S. striata, Asia ; 

 S. lineata, Asia ; S. subulata, Africa ; 

 S. curvata, America. 



S. doliolus (Wallich). — Frustules 

 linear ; valve subarcuate, pseudo-nodide 

 absent. Stri^ 30 in -001". -0020" to 

 •0050". Salpae. Indian Ocean, Atlantic. 

 WaUich, TMS. viii. p. 48, pi. 2. f. 20. 



Genus DESMOGOI^IUM (Ehr.). — We are unacquainted with the characters 

 of this genus ; Ehrenberg's figures of it seem to show a relation to Synedra, 

 the tablets (not single frustules) being attached to each other by a connecting 

 substance, end to end — an arrangement which simulates a filament. 



