23 



Biddulphieae. 



Schmidtiella Ostf. n. gen. 



Frustules in chains. Valves broadly elliptic with undulate 

 surface, most elevated at the 

 sagittal plane, cohering one to 

 another by two minute processes 

 at the sagittal plane. Frustules 

 in a front-view rectangular. No 

 structure seen. Endochrome coc- 

 cochromatic. 



Allied to Graya Brun & Grove 

 [see Van Heurck, A Treatise on the 

 Diatomaceae p. 458, f. 187] and per- a he 



haps forming a connection between 



the Chaetocereae and the Biddul- Fig. 20. Schnmltiella pelagica Ostf. 

 phieae. ^* chain of two cells in front view, b in 



sagittal view, c cell in side view (112). 



62. S. pelagica Ostf. n. sp. 



Gharacteis of the genus, frustules in front view 80^ broad, in 

 sagittal view 40;/ broad. 



I have only fonnd one chain of this interesting diatom which I name 

 in honour of the Danish botanist Jobs. Schmidt who made those rich 

 collections in Siam which he is publishing in the „Flora of Koh Chang". 



Eucampia Ehbg. 



63. E. biconca?a (Gl.) Ostf. ms. ; CUmacodium hiconcavum Gleve, 



Phytoplankton p. 22, PI. 2, f. 16,17; Ath Plankt. Organisms p. 314; PI. 



f. the Red Sea, p. 1033; PI. f. the Indian Ocean and the Malay Archip. 



p. 19; Eucampia hemiauloides Ostf. in Ostenfeld & Schmidt, PI. f. the 



Red Sea p. 157, f. 9. 



According to a letter from Mr. Gleve his CUmacodium hiconcavum is 

 identical with my Eticampia hemiauloides, and consequently his species- 

 name has the priority, but as shown in my paper it must be an Eucam^ria, 

 with die same structure as the other species of this genus. 



2(r) — iHvr) - 4 (it) — 5 (it) — 6 (it) — 7 (r) — 10 (it). 

 Area: Tropical Atlantic Ocean, Mediterranean, Red Sea, Gulf of Aden, 

 Malay Archipelago. 



64. E. corniita (Gl.) Grun. in Van Heurck, Synopsis PI. 95 bis, f. 5; 

 Gleve, PI. f. the Red Sea p. 1033, PI. f. the Indian Ocean and the Malay 

 Archip. p. 21; (?) Atl. Plankt. Organisms p. 326; Molleria cornuta Gleve, 

 Diat'f. the Sea of Java 1873, p 7, PI. 1, f. 6; Leuduger-Fortmorel, 1. c. 

 •p. 47. 



r, (IT) - 10 (r). 



