Bacillariese, Naviculaceae, Mastogloia. 313 



S. Febigerii est forma monstrosa cujusdam Naviculcu (forte cuspidatce). 

 S. Craticula H. L. Sm. Sp. Typ. n. 588. Conf. Craticulam Ehren- 



bergii. 

 S. elegans H. L. Sm. Sp. Typ. n. 509. 



CRATICULA Grun, [1868] Alg. Novara p. 20 (Etym. cratos robur). 

 — Genus idem ac Sticlodesmis Grev, quod vero anterius. Statum 

 peculiarem Naviculacearum sistens. 



1. Craticula Perotettii Grun. Alg. Novara p. 20, t. 1, f. 21. 



Hab. inter Nitellas in Senegalia (Perrotet). 



2. Craticula procera (Ehr.) Grun. I. c. pag. 20, Surirella procera 

 Ehrenb. 



3. Craticula megaloptera (Ehr.) Grun. 1. c. pag. 20, Surirella mega- 

 loptera Ehr. 



4. Craticula Ehrenbergii Grun. Surirella Craticula Ehr. 



RHAPHIDODISCUS Christian [1887] in Microscope 1887 (Etym. rhaphe 

 et discus) specierum nomina 3 (R. Christiani Gascoyne, R. Febigeri 

 Christ., R. marylandica Christ. in Microscope 1887) amplectens 

 Naviculam disciformem Peticolas sistit. Photogramma Rhaphi- 

 dodisci Christiani Gasc. in collectione Debyana vidi quod Navi- 

 culam in Melosirce disco inclusam deraonstrat. 



MASTOGLOIA Thwait. [1856] in W. Smith Br. Diat. II, pag. 63 

 (Etym. mastos mamilla et gloios gelatinosus), Grun. in Wien. Ver- 

 handl. 1860, p. 574, Rabenh. Fl. Eur. Algar. I, pag. 260, V. H. 

 Syn. p. 69, De-Toni Osserv. Tasson. Bacill. p. 897 p. p. Cocconeidis, 

 Naviculcv et Pinnularicu sp. auct., DickieicB sp. Thwait. — Frn- 

 stula naviculaeformia, rectangulari-oblonga, saepius in pseudothallo 

 gelatinoso plus rainus mamilloso nidulantia; valvae loculis margi- 

 nalibus e laminis siliceis inter membranara connectivalem et val- 

 vam positis efFormatis prseditae. 



Obs. Genus hinc Naviculaceis, illinc Cocconeidaceis affine. 



A. Striae valvarum non lyrse ad instar ob sulcos interruptfe. 

 1. Loculi in utroque latere numerosiores, ultra quam 5. 



1. Mastogloia Smithii Thwait. in W. Sm. Br. Diat. II, p. 65, t. 54, i 2 46 

 f. 341, Grun. in Wien. Verhandl. 1860, p. 575, t. 5, f. 11, Diat. Kasp. 

 p. 13, Rabenh. Fl. Eur. Algar. I, p. 261, 0'Meara Ir. Diat. p. 327, 

 t. 29, f. 12, Brun Diat. Alp. p. 92, t. 8, f, 28, V. H. Syn. p. 70, 

 t. 4, f. 13, Navicula biscalaris Breb. in W. Sm. Diat. II, p. 65. 



