8i4 feacillarieae, Eunotiaceae, deratoneis. 



Specios removenda. 



17. Amphicampa aequatorialis Cleve Diat. of Sea of Java p. 12, t. 3, 

 f. 17, est Amphiproracea. 



CERATONEIS Ehr. [1840] Leb. Kreideth. t. 4, emend. Grun. [1865] 

 Desm. Diat. ins. Banka p. 7 [Eiiceratoneis], (Etym. ceras cor- 

 nu), Kirchn. Alg. Schles. pag. 215, De Toni Osserv. tasson. Bacill. 

 1890, p. 910. — Valvse arcuatae quasi eunotia^formes, nodulis ter- 

 minalibus distinctis, centrali annuliformi, subdistincto, pseudorha- 

 phe margini concavo maxime approxiraata; frustula libera (raro 

 cohaerentia), e facie connectivali visa linearia. 



Obs. Genus ad Cymbellaceas vergens at rhaphes genuinae ab- 

 sentia ab hac familia recedens. 



1. Ceratoneis Arcus (Ehr.) Kuetz. Bacill. p. 104, t. 6, f. 10, Rabenh. 3270 

 Siissw. Diat. p. 37, t. IX, f. 1, Alg. n. 362, 584 et 1027. Fl. Eur. 

 Alg. I, p. 70, Eunotia Arcus W. Sm. Br. Diat. I, p. 15, t. II, f. 15, 

 Naincula Arcus Ehr. Inf. p. 182, t. XXI, f. X, Synedra gibbosa 

 Pritch. Inf. p. 786, Cymbella Arcus Hassall Freshw, Alg. t. 100, 



f. 6, Ceratoneis Toxon Perty Ki. Lebensf. p. 205, t. 17, f. 13, 

 Rabenh. Fl. Eur. Algar. I, p. 77, teste Grunow. — Valvis anguste 

 lineari-lanceolatis, ad 100 (plerumque 30-70) a. longis, arcuatis, api- 

 cibus attenuatis subinde capitellatis revolutisque, margine ventrali 

 concavo, medio (ad pseudonodulum centralem) sabtumescente, raro 

 subexciso, striis delicatissimis 13-14 in 10 u. 



Hab. in rivulis, raro aquis quietis imprimis regionum alpestrium 

 in Italia, Austria, Tirolia, Galiia, Germania, Helvetia, montibus 

 Tatricis, Anglia etc. — Var. ?amphioxys (Rabenli.), Ceratoneis 

 Amphioxys Rabenh. Siissw. Diat. p. 37, t. IX, f. 4, Fl. Eur. Al- 

 gar. I, p. 76, Schum. Diat. H. T. p. 65, t. II, f. 33, Grun. Desm. 

 Diat. Banka p. 7: robusta, valvis 75-76 a. longis, dorso leniter 

 convexis, ventre subinflatis, pseudonodulo centrali elevatissimo, sub 

 polis constrictis, apicibus recurvatis subcapitatis, striis obliteratis. 

 In fossis, stagnis Saxoniae, Borussia?, Moraviae (J. Nave) etc, passira. 



Species ulterius inquirenda. 



2. Ceratoneis? Cretae Ehr. in Ber. Berl. Akad. 1844, p. 77, Mikro- 3271 

 geol. t. 22, f. 61, Kuetz. Sp. p. 88. — Levis, navicularis, medio 



