308 



Ove Paulsen. 



9. Peridinium ovatum (Poucliet) Schutt, Die Perid. d. Plankton 

 Exp. 1895 tab. XVI, fig. 49, 1896 fig. 19. Paulsen Nord. Plankton 

 p. 44, fig. 54. Broch, Spitzbergen Plankton p. 40, fig. 9 — 10, non 

 Fauré-Freniiet 1908 p. 219, tab. XV, fig. 6. — Protoperidinium ovatum 

 Pouchet Journ. Anat. Physiol. 1883 p. 35, tab. 18—19, fig. 13. Peri- 

 dinium lenticulatum Fauré-Fremiet, Ann. sc. nat. zool. 9. sér. 1908, 

 p. 217, fig. 4, tab. XV, fig. 5. 



Occurred in single specimens in Danmarks Havn and in the 

 coastal water. Rather common in the outer part of the pack-ice 

 but common in the open sea outside it. 



D i strib. Horeal oceanic si)ecies, widely distributed in the Atlantic 

 and its tributaries. 



10. Peridinium curvipes Ostenfeld, in Botany of the Faeroes 

 1906 p. 15, fig. 128. Paulsen Nord. Plankton p. 45, fig. 55.— '? Broch, 

 Spitzbergen Plankton p. 42, fig. 11 13. 



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

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



D ^ — '■—-^ £ -~ -^ p 



Fig. 6. Peridinium curinpes. 'i.'iO t. m. 



and shorter than the original figure published by Ostenfeld. But 

 those figured by Broch 1. с. are different. 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, о 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 о is long as in P. pellucidum and P. islandicum. From this 

 difTerence it follows that Broch and the present author have had 

 different species before us. Which is the true P. curvipes:^ From 



