646 Bacillarieae, Trachyspheniacese, Seeptroneis. 



fix.a (?), cuneata, stjliformia, valvse lanceolato-clavata^, transverse 

 striatae, non costatce, striis moplliforjuibus pseudoriiaphe inter- 

 ruptis. 



Obs. Valvai fere Trachi/sphenice gomphonematoideae sed fru- 

 stula e zona connectivali visa cuneiforraia sunt. 



1. Sceptroneis caducea Ehr. in Ber. Berl. Akad. 1844, pag. 264 2564 

 {Sceplroneis caduceus, ex errore typogr., Styloneis), Mikrogeol. 

 tab. 33, XVII, fig. 15, Bailey in Araer. Journ. of Science XVIII, 

 tab. 4, fig. 11, Greg. Diat. of the Clyde pag. 59, tab. 6, fig. lOG, 

 Rabenh. Fl. Ear. Algar. I, p. 299, Pritch. Inf. p. 772, t. 4, f. 11, 



V. H. Syn. t, 37, f. 5. — Valvis elongatis, medio turaidis, utroque 

 flne capitato-tumidis. 



Hab. ad oras Scotia? (Gregory); fossilis in Virginia (Ehren- 

 BERg). 



2. Sceptroneis ?gemniata Grun. Hedw. V, pag. 146, D. Fr. Joii. L. 2565 

 18^4, p. 5, t. 2, f. 7-S, vix Kitton J. Q. M. C. 1871, p. 170, t. 14, 



f. 4-5. — Parva, frustulis e facie connectivali visis lineari-lan- 

 ceolatis, apicibus truncatis, valvis subclavatis, lineari-lanceolatis, 

 50-90 c; 5-7,5, basin versus attenuatis, ante apicem parum constri- 

 ctis et capitulo oblongo terminatis, granulis (costis) abbreviatis, 

 validis, 4^2 i" ^O y.., area mediana longitudinali latiuscula. 



Hab. in Molera [Moler) ad (( Mors » (Grunow); ad ccFranz 

 Josefs Land » (Grunow). — A Sceptroneide caducea Ehr. sat 

 diS^erre videtur. 



3. Sceptroneis intermedia Cleve Diat. Vega p. 507, t. 37, f. 60. — 2566 

 Vaivis linearibus, apicibus leniter dissimilibus, 30 = 18, pseudorha- 

 phe haud visibili, striis I6V2 i'i 10 f-'-» subtiliter punctatis, apici- 

 bus lineis radiantibus punctulorum ornatis, 



Rab. in mari prope (cPoint de Galle » insuhe Ceylonse (Kjell- 

 man). 



4. Sceptroneis Fciavata (Grev.) Grun. New Diat. fr. Honduras 1877, 2567 

 Synedra clavata Grev. in Trans. Micr. Soc. 1865, pag. 25, t, 3, 



f. 4, vix Witt in Journ. Mus. Godefr. 1873, p. 70, f. 14. — Val- 

 vis late clavatis, 200 =; 34-36, apice inferiori (angustato) truncato, 

 superiori subrotundato-conoideo; striis asperis, lineis longitudina- 

 libus tribus interruptis, 5^^ in 10 y.. 



llal). fossilis in dopositu Barbadensi, rarissiine (C. Joiinson). 



5. Sceptroneis ?Gomphonema (Jan. ot Rabonh.) Grun. iNew Diat. fr. 2568 

 Honduras 1877, Synedra Gomphonema Jan. et Rabenh. Diat. Hon- 



