KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 32. N:0 8. 



25 



[C. Granii Cl., mentioned in my paper »Plankton Researches in 1897», was not seen 

 in 1898. This species, represented in the annexed figg. 7 and 8, foi^ms loose chains of 

 rectangular, thin-walled cellules (longit. : sagittal axis = 1:2). Foramina large, elongate 

 hexagonal, smaller than tlie cellules. Awns arising from the angles of the cellules, sagittal 

 and obliquely transverse. Their basal part \'3 as long as the longitudinal axis. The 

 cellcontents seem to contain one parietal plate. Endocysts biconvex, in transverse sagittal 

 section elliptical, covered with numerous simple spines. Sagittal axis 0,oi3 to 0,oi5 mm. — 

 Måseskär in March 1897.] 



Fig. 7, 8. Chcetoceros Granii Cl. 1000 t. m. 



C. hieinalis Cl. — In June rare E. of Firth of Tay and common W. of Skagen. 

 In the Skagerak from the end of March to June more or less abundant, and in October, 

 November. 



The annexed tig. 9 represents the endocysts 500 t. magnified. They 

 resemble those of C. laciniosus. 



C. laciniosus Schutt. — Rare in the Skagerak, January — March, less 

 rare in November. 



Fis. 9. 



C. ScMttii Cl. follows as a rule C. curvii^etus and C. didymus. — A. In the 

 North Sea rare in March at the Fisher Bank, in June W. of Cape Stadt, in JSfovember 



K. Sv. Vet. Akad. Handl. Band 32. N:o 8. 4 



