31. Ch. robustum (Cleve) Ostf. ms.; Ch. peruvianum var. 
robustum Cleve, Diatoms from the Sea of Java, 1873, p. 8, Pl. II, 
f58R Cs Dored ?: Landon cs sp 78, 170 
Denne Form synes karakteristisk og konstant nok til at være 
en egen Årt. 
VII 291. (rr) — Ba 15/17 (rr) — XX b 2/5 (rr). 
32. Ch. rostratum Lauder, 1. c., p. 79, f. 10. 
NILLa 7/11 (77). 
33. Ch. Schmidtii Ostf. mn. sp. 
Chains multicellular, frustules longer than wide (width about 
28 4), in a front view rectangular with sharp angles, valve elliptic- 
N 
Fig.8. Chætoceras Schmidtii Ostf. 
(81774. 
AN 
circular, hoop very long, at least 2/3 of the length of the cell, fora- 
mina broadly linear. Awns very long, rather robust, issuing from 
