BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 22. AFD. III. N:05. ål 
chain delicate, nearly parallel to the sagittal axis; in trans- 
verse view diverging at an acute angle. Terminal awns 
somewhat stronger than the others, diverging, and with a 
spiral of small puncta. Cellecontents coccochromatic. 
Marine: Westcoast of Sweden (February 1896). 
Navicula entoleia CL. N. sp. V. elliptical, with some- 
what cuneate ends. &L. 0.038; B. 0.015 mm. Median line with 
somewhat distant central pores. Axial area half as broad as 
the valve. BStrie 11 in 0.01 mm., parallel in the middle, 
slightly radiate at the ends, punctate; puncta forming rows 
parallel to the margin. 
Marine: Kattegat, north of Kullen, a single specimen 
among arctic plankton. 
Silicoflagellates. 
Dictyocha tripartita ScHum. (Schr. d. phys. oek. Ges. zu 
iKönisspero. 1867, p. 67, Pl I, fig. 28. D. (Hbria). Forniz 
MögBivs, Fäönft. Ber. d. Kommiss. zur wiss. Unt. d. Deut. 
Meere im Kiel 1882—86, p. 122, P1. VIII, fig. 53, 1887). This 
peculiar form, which occurs in a fossil state in the deposits 
from the Litorina epoch, seems to be characteristic of the 
baltic plankton. 
Dictyocha Speculum EHB. is no doubt the same as D. 
gracilis Kötz, and as EHRENBERG'S name dates from 1838 it 
must have preference of KöTzINGS of the year 1844. 
Flagellates. 
Dinobryon pellucidum LEVANDER (Acta Soc. p. F. et Fl. 
Hona T2 Ip. ol. Bl IL fig. 1, 1894). 
Cilioflagellates. 
- 
Ceratium Tripos var. arctica AuriviLLIus Ms. This 
form was not distinguished from the type, when I examined 
