Bacillariaceae. 67 



Die Begrenzung der Gruppen ist am kürzesten aus den zu jeder einzelnen gerechneten 

 Gattungen zu ersehen. Es umfassen nach Petit: I. Achnantheae: Cocconeis, Achnan- 

 thidium, Achnanthes. II. Gomphonemeae: Bhoicosphcnia, Gomphoncma. III. Cymbel- 

 leae: Cocconema, Cymbella, Encyonema, Amphora, Epithemia, Brebissonia. IV. Navicu- 

 leae: Navicula (Schizonema), Pleurosigma, Scoliopleura, Stauroneis. V. Amphiproreae: 

 Amphipleura, Berkeleya, Amphvprora. VI. Nitzschieae: Nitzschia, Ceratoneis, Tryblio- 

 nella. VII. Surirayeae: wie bisher. VIII. Synedreae: Synedra, Staurosira. IX. Euno- 

 tieae: Eunotia, Himantidium. X. Fragilarieae: Fragilaria, Diatoma und viele marine 

 Gattungen. XI. Meridieae: Meridion, Eucampia. XII. Licmophoreae: Podosplienia, 

 Licmoplwra, Climacosjihenia. XIII. Tabellarieae: Diatomella, Grammatophora , Tabel- 

 laria, Tetracyclin, Bhabdonema, Striatella. XIV. Biddulphieae: Isthmia, Biddulphia, 

 Amphitctras, Triceratium. XV. Coscinodisceae: Coscinodiscus u. s. w. XVI. Melosi- 

 reae: Cyclotella, Melosira. 



20. Schmidt. Atlas der Diatomaceenkunde. (No. 24.) 



Von diesem Abbildungswerke sind vier weitere Hefte (9 — 12) erschienen. — Die in 

 Aussicht gestellten Erläuterungen bleiben dagegen noch immer zu wünschen. Die neuen Hefte 

 behandeln die Gattungen Aulacodiscus, Asteromphalus, Amphora, Stauroneis und die Gruppe 

 der Pinnularia nobilis, viridis, Brebissonii, divergens, pachyptera, inierrupta, directa, oblonga. 

 Von einer Aufzählung der genannten neuen Arten sehen wir ab, da nirgends Diagnosen ge- 

 geben, somit die Namen ohne die Abbildung inhaltslos sind, und au.ch diese ganze Art der Auf- 

 stellung neuer Species ohne diagnostische Angabe ihrer Grenzen dem Ref. bedenklich scheint. 



21. O'Weara. A form of Navicula divergens. (No. 10.) 



22. — New Species of Synedra, (No. 11.) 



23. — Navicula Stokesiana n. sp. (No. 12.) 



24. — Diatomaceous forms with a new species of Colletonema etc. (No. 16.) 



Die in Rede stehende Form von N. divergens zeichnet sich durch elliptischen 

 Umriss aus. 



Synedra spathiüata n sp. Fructules very large, length 0,013", in front view wider 

 at the ends than at the middle ; greatest breadth 0,0012", ends streight ; in side view wider 

 at the middle and gradually attenuated towards the ends, at some distance from which 

 (0,0025"), bending inwards and then outwards, then suddenly constricted towards the broadly 

 capitate rounded extremities. Royal Canal, Kilcock. 



Navicula Stokesiana n. sp. Valve large, rhombic lanceolate, length 0,0045, breadth 

 0,0018; marginal striate band wide, inner to be elevated above the general surface, free 

 space included within the inner margins of the inner stiiate bands narrowlinear, forming in 

 the middle a very narrow stauriform line ; space intermediate between the inner and outer 

 striate bands occupied by lines of Striae which seein to be prolongations of the Striae of 

 the outer striate band; Striae close, punctate radiate. Similar to N. irrorata A. S. but 

 distinguished by the fact of having the intermediate space striate. 



Colletonema Ribernicum n. sp. Tubes simple. The included frustules very small, 

 decidedly navicular, with very faint Striae. 



25. Cottam. A new Diatom. (No. 2.) 



Ein Aidacodiscus von der westafrikanischen Küste: „Agrees with A. Kittoni in the 

 arrangement 'of its granulation, although the granules are smaller. It differs in having a 

 small umbilicus and in its processes, which, instead of being mammiform. have distinct 

 circular hoods. It differs from A. Johnsonii in the arrangement and the size of the granules 

 and especially in the fact, that A. Johnsonii has no raised portions under the processes, 

 and has granules of very different sizes on the same valve. 



3. Verbreitung. 



26. Guinard. Indications pratiques etc. (No. 3.) 



Enthalten auch eine Bacillariaceen-FloTa. der Umgegend von Montpellier. 



27. Lanzi. Le Diatomee raccolte dalla spedizione della societa geografica italiana in 

 Tunisia. (No. 8.) 



Lanzi untersuchte drei marine Aufsammlungen (vom Golf vom Gabes, Capo buono 



5* 



