Bacillariese, Plagiogrammacese, Glyphodesmis. 715 



22. Dimerogramma construens U. L. Sm. Sp. T. n. 140 ost Fragilaria 

 consf)'uens. 



23. Dimerogramma birostre Ralfs in Pritch. Inf. p. 790 est Fragi- 

 laria birostris. 



24. Dimerogramma Baldjiclcii Pritch. Inf. p. 791 (an Walk. et Chase 

 New Diat. I, p. 1, t. 1, f. 3?) est Achnanthes Baldjickii. 



25. Dlmerogramma Arcus Arnott in Habirsh.-Chase Catal. Diat. (ex- 

 emplar Debjanum) p. 98 est Campijlosira cijmhelliformis. 



26. Dimerogramma Williamsonii Gmn. est Ghjphodesmis WilHam- 

 sonii. 



27. Dimerogramma distans (Greg.) Ralfs est Glyphodesmis distans. 



GLYPHODESMIS Grev. [1862] in Micr. Journ. 1862, p. 234 em. Ca- 



strac. [1887] Diat. Chalienger p. 43 (Etym. glypho excavo, sculpo 

 et desme fasciculus), Notarisia 1889, pag. 686, De-Toni Osserv. 

 tasson. Bacill. 1890, p. 906. — Frustula seriatim conjuncta; valvaj 

 naviculares. pseudonodulo centrali et pulvinulis terminalibus dona- 

 tjie, structura clatlirata, granulis transverse quadrato ordiue dispo- 

 sitis, linea centrali (pseudorhaphe) subconspicua. 



1. Glyphodesmis Williamsonli (Greg.) Gnui. in V. H. Syn. Diat. Belg. 2888 

 t. 36, fig. 14, llimantidium% Williamsonii W. Sm. Br. Diat. II, 



p. 14, t. 33, f. 287, Diadesmis Williamsonii Greg. Diat. of Clyde , 

 p. 25, t. 2, fig. 40, Rabenh. Fl. Eur. Algar. I, p. 260, Heterom- 

 phala Himantidium Ehr. in Ber. Berl. Akad. 1858, p. 13, Abh. 

 1872, t. 2, f. 29, Dimeregramma Williamsonii Grun. in Wien. 

 Verhandl. 1862, p. 377, Glyphodesmis adriatica Castr. Diat. 1873, 

 p. 22, f. 3, A. Schm. Nords. Diat. t. 3, f. 11-12, Flagiogramma 

 Himantidium Ralfs in Pritch. Inf. p. 775. — Frustulis e facie 

 connectivali visis rectis, tumoribus centrali, terminalibus duobus- 

 que intermediis donatis ; valvis striatis, striis circiter 7% in 10 a., 

 teste Gregory 11-12 in 10 u.. 



Hab. ad oras Scotise, Hiberniae, Lusitania^, Italiae, in mari adria- 

 tico (Grunow, Castracane). 



2. Glyphodesmis distans (Greg.) Grun. in V. H. Syn. t. 36, f. 15-16, 2889 

 Dimeregramma distans (Greg.) Ralfs in Pritch. Inf. p. 790, t. IV, 



f. 34, Grun. in Wien. Verhandl, 1862, p. 376, Rabenh. Fl. Eur. 

 Algar. 1, p. 123, V. H. Syn. t. 36, f. 15, Denticula distans Greg. 

 Diat. of Clyde p. 495, t. 10, f. 36. — Major, robusta; valvis late lan- 

 ceolatis, 40-75 ix. longis, apicibus obtuso-rotundatis ; striis validis- 



46 



