;5(>,s 



Om: 1'ai i.skn. 



't. Peridinium ovatiim (Pouclu'l) Schiill, Die Perid. d. IMimkloii 

 Kxj). IS«.»:) Uli). XVI, li^. lU, ISIIC) lij«. H). P:iiilseii Nord. PlanUloii 

 p. 44, lig. r)4. Broch, SpilzbergcMi Plankton p. 40, fig. 9 — 10, non 

 l'\uiré-Freniiel 1908 p. 219, lab. XV, Hg. 6. - Protnpcridinium onaliiin 

 Poiirlu'l .lourn. Anal. Phy.siol. 188.'^ p. I}."), lab. 18-19, Hg. l.'i. Peri- 

 (liniiun Ifiüiculatniu Fauii'-Fremiel, Ann. se. nat. zoo). 9. sér. 1908, 

 p. 217, lig. 4, lab. XV, lig. f). 



Occurred in single specimens in ]~)anniarks Havn and in the 

 coaslal water. Halher common in the outer part ol' the pack-ice 

 but common in the open sea outside it. 



1) i si ril). Boreal oceiuiic species, widely dislrihiiled in the .\tl;uilic 

 :ui(l ils Irihulnries. 



10. Peridinium curvipes Ostenfeld, in Botany ol the Faeroes 

 1906 p. 1.'), lig. 128. Paulsen Nord. Plankton p. 45, fig. 55.— ? Broch, 

 Spitzbergen Plankton p. 42, fig. 11 — 13. 



The cells represented in the annexed fig. 6 are such as have 

 been considered by me as P. curvipes although its form is broader 



E ^ F 



Fig. (5. Peridinium curvipes. '2.')() t. ni. 



and shorter than the original figure published by Ostenfeld. But 

 those figured by Broch 1. c. are difTerent. Unfortunately Broch 

 gives no figure of his species in ventral view (nor measures), but 

 from his figures of epitheca and hypotheca it appears that the 

 plates of his "P. curvipes'' are arranged otherwise than in mine. 

 Thus Broch has the rhombplate (1) oblique, d small, and the plates 

 1, b, 2 and a touch each other in a point, 1 and f do not touch 

 each other. My fig. 6 shows that the rhomb-plate is not oblique 

 and that 1 and b, 1 and f meet along vertical lines. The inter- 

 calary o is long as in P. pellucidum and P. islandicum. From this 

 difference it follows that Broch and the present author have had 

 different species before us. Which is the true P. curvipes-? From 



