OF THE SUEIRELLE^. 



Acus, E Inf. p. 176, 1. 13. f. 4. (ix. 147.) 

 Germany and France. 



S. dissipata (K.). — Slender, affixed, 

 radiant ; front view narrow linear, trun- 

 cate- valves narrow lanceolate, acute. 

 KB. p. 64, t. 14, f. 3. = *S'. fasciculata, 

 EI. t. 17. f 3. Fresh water. Europe, 

 Australia, and Asia. 



S.famelica (K.). — Delicate, irreo-ularly 

 aggregated, very narrow linear, truncate 

 in lateral view, front view rather acute. 

 KB. p. 64, t. 14. f. 8. 1. Fresh water. 

 Gennany. Is a somewhat larger form of 

 S. dissipata, Rab. 



S. radians (K,). — Delicate, densely 

 aggregated, radiant ; front view very nar- 

 row linear, truncate ; valves narrow lan- 

 ceolate, rather obtuse. 103. p. 64, t. 14. 

 f 7. Europe. 1-600". A minute species. 



S. tenuissima (K.). — Very slender, 

 elongated J front view exactly linear, 

 truncate ; valves acicular, acute. KB. 

 p. 64, t. 14. f. 6. Stagnant waters. 

 Germany and France. 1-180". 



S. tenuis (K.). — Slender, elongated; 

 front view exactly linear, truncate ; 

 valves narrow lanceolate, with some- 

 what obtuse apices. KB. p. 65, t. 14. 

 f. 12. Fresh water. Germany and 

 France. 1-168". 



S. Acuta (K.). — Slender, elongated, 

 lanceolate, in front \dew truncate, in 

 lateral view very acute. KB. p. 65, 1. 14. 

 f 20. Fresh water. Dalmatia and 

 France. 1-72". 



S. IcBvis (E.). — Slightly and irregularly 

 affixed ; front view slightly attenuated, 

 truncate; valves more attenuated, ob- 

 tuse. EA. t. 2. 6. f 2. Marme. Em-ope 

 and America. 1-130". 



S. gracillima (Rab.). — Front view 

 elongated, very narrow linear ; valves 

 linear, acicular, acute. Rab D. p. 53, 

 t. 4. £ 20 d, e. Dresden. 



S. satina (S.). — Valves lanceolate, 

 gi-aduaUy tapering towards the somewliat 

 obtuse apices ; striae distinct, 32 in -001". 

 SBD. i. p. 71, pi. 11. f 88. Marine. 

 England. 



S. apiculata (Rab.). — Very slender ; 

 valves linear, acicular, with shortly 

 tapering apices, faintly striated. Rab D. 

 p. 56, t. 5. f 20 a, b, c. Dresden. 



S. amphicepliala (K.). — Slender ; front 

 view linear, truncate ; valves narrow 

 lanceolate, tapering, with capitate apices. 

 KB. p. 64, t. 3. f. 12. Fresh -water. 

 Germany. 1-360". 



^.fontinalis (S.). — Frustules scattered ; 

 valves linear-lanceolate or elliptic-lan- 

 ceolate, with produced, subcapitate 

 apices; nodule indefinite; striae 27 in 



•001", Sm ANH. 1857, p. 9, pi. 1. £ 9. 

 Fresh water. Pyi-enees. 



S. gi1)l>a (E.).— Smooth, fasciculated, 

 elongated, narrow linear; valves broadly 

 tumid at the middle, with gradually 

 attenuated, obtuse apices. EA. p. 137. 

 United States. 



S. delicatissima (S.). — Valves elon- 

 gated, very narrow, gradually tapering 

 to the subacute apices ; striae 27 in -001 . 

 SBD. i. p. 72, pi. 12. f. 94. Pseudo-nodule 

 indefinite. 



S. tenera (S.). — Frustules clustered ; 

 valve nearly linear or attenuated towards 

 the slightly inflated apices ; nodule inde- 

 finite ; striae 60 in -001". SBD. ii. p. 98. 

 Fresh water. Britain. In outline not 

 unlike S. delicatissima, but far smaller 

 and with more delicate striae, Sm. 



S. lanceolata (K.). — Front view nar- 

 row linear, with slightly dilated apices ; 

 valves lanceolate, distinctly striated, with 

 a blank, rhomboid median space. KB. 

 p. 66, t. 30. £ 31. America. 1-600" to 

 1-310". 



_S. dehilis (K.). — Minute; front \dew 

 slightly attenuated, truncate, with obso- 

 letely striated margins; valves lanceo- 

 late, with produced apices. KB. p. 65, 

 t. 3. £ 45. = *S'. porrecta, Rab D. p. 65, 

 pi. 4. £ 27. Stagnant waters. Em^ope, 

 common. 



_S. mesolepta (K.). —Delicate ; front 

 view dilated at the ends ; valves lan- 

 ceolate, curved or slightly sigmoid. 

 KB. p. 66, t. 30. £ 30. America. 

 1-160". 



S. notata (K.). — Small, with obsoletely 

 striated margins; front \'iew quadran- 

 gular; valves eUiptic-oblong, with ob- 

 tuse ends. KB. p. 65, t. 3. £ 33. Stag- 

 nant waters. Em-ope. 1-650". 



S. 3Iartensiana (K.). — Small, di- 

 stinctly striated ; front view linear, trun- 

 cate; valves rather broader, lanceolate, 

 subacute. KB. p. 65, t. 3. £ 9. Marine. 

 Europe. 



_S. VaucliericB (K.). — Minute; front 

 view linear, truncate; valves linear- 

 lanceolate with somewhat produced 

 ends, indefinite pseudo-nodule, and 30 

 marginal striae in -001". KB. p. 65, 

 t. 14. £ 4; SBD. i. p. 73, pi. 11. £ 99. 

 Fresh water, especially on species of 

 Vaucheria. Em-ope. 



S. cequalis (K.), — Front view dilated 

 at the ends ; valves linear, with rounded 

 apices, indefinite pseudo-nodule, and 24 

 striae in -001". KB. p. m, t. 14. £ 14. = 

 aS'. obtusa, SBD. i. p. 71, pi. 11. £ 92. 

 Stagnant waters. Europe. 1-140". 



S. ini'.cstiens (S.). — Valves linear, 

 3e2 



