205 



c.icteris In synonima allatis praeponendiim arbitravi, vice 

 eniin iiiter hoc illudque Biddnlphia, antlquitatis causa, cir- 

 cumscripta, innovatiouis supervacaueae horror persuasit 

 postremum ad species plures Diatoraearum designandas adlii- 

 bitum a Desmidiels expungere primumque a Diatomeis jam 

 exclusum in medinm aiferre. 



1. Isthmia vcsiculosa Ag,, cellulis cllipticls, transverse 

 crcbre striatis, isthmo unico conjuuctis; iuteraneis flacci- 

 dis. — Ag, Consp. Diatora. p. 55. (1832). — Diatoma? 

 vesiculosura Ag» Syst. p. 7. n. 16. — Biddulphia vcsi- 

 culosa Ktz. Synops. Diatora. p. 82. 



2. Isthmia vcrtebrata — y cellulis e latere ellipticis, trans- 

 versim diraidiatis, bilobls, e dorso oblongis, medio de- 

 pressis, isthmo uuico conjuuctis; iuteraueis ovato-lanceo- 

 latis ad cxtrcraitatcs in larainas binas inflexas partitis. — 

 Desmidium vertebratum Breb^l 1. £. p. 65. PI. II. (1835). 



(V. T.) 



3. Isthmia filiforinis — , cellulis ellipticis, transversim di- 

 midiat/s, bilobis, isthmo duplici coujunctis; iuteraneis (gra- 

 nulosls?). — Odontella? filiforrals Ehr, lufusor. p. 154. 

 n. 180. (1838). — Tessarthra filiformis Ehr, 1. c. T. X. 

 f. XXI. 



4. Isthmial stomatotnorpha — , cellulis e dorso ellipticis, 

 e l^atere linearibus,, lunulatis, convergentibus, apicibus si- 

 mul conjuuctis. ■ — Achnanthes stomatomorpha Turp, Dict. 

 des sc. nat. par Levr. Atl. Veg. ves. f. 11. (1820), Mem. 

 du Mus. T. XVI. p. 295 sq. PI. XIII. f. 10. — Scenedes- 

 raus storaatoraorphus Ktz, 1. c. p, 80. n. 8, Breb, 1. c. 

 p. 60. n. 1. PI. VIII. — Odontella stomatomorpha? Ehr, 

 lufusor. p. 152. 



Species inquiretidae, 



5. ? Sphaerodesmus bicolor Corda 1. c. p. 126. PI. VI. f. 85. 



6. ? Sphaerodesmus depressus id. f. 86. 87. 



