581 



71. (?) P. decipiens Jorgensen, 1. c. p. 40; Gran, Das Plankton 

 des \orw. Nordmeeres, 1902, p. 1.S7, lig. 12. 



A iittle Peridinium, which resembles Gran's figures of P. deci- 

 piens Jorg., was found 

 in March 1001 . I have 

 given figures of it for 

 comparison; they are 

 rat her like those of 

 (i ran, l>nt Jorge li- 

 sen' s deSCriptioil doeS Fig. 128. Peridinium decipiens Jflrg. ?) var. curvipes Ostf., n. var. 



The same cell in different views ('"/i 1 . 



notagreewell with them, 



the siiecimens nol being »flat, almost cake-like« (»llaeh, fast kuchen- 

 formig«); they are characterized by their prominent curved list on 

 the left side ol' the longitudinal lissnre (var. curvipes n. var.). 



72. P. pellucidum (Bergh) Schiitt, Die Peridineen der Plankton- 



Expedition, PI. 14, tig. 45; Protoperidi- 

 nium pellucidum Bergh., 1. c. p. 227, 

 ligs. 46—47. 



Neritic species. Rare around the Færoes, 

 found in January, May, July, August and 

 December. Allied to the following species. 



Fig. 129. Peridinium pellucidum (Bergh) 



Schiitt, a specimen from the Kattegat ; the 



same cell in different views i "-'"" i 



73. P. pallidum Ostf., Iagttagelser, etc., 1899, p. 60; Cleve, K. 

 Sv. Vet. Akad. Handl., Bd. 34, No. 1, 1900, p. 17, PI. VII, figs.21,22; 

 P. pellucidum Gran, Das Plankton d. Norw. Nordmeeres, p. 1N0, 

 fig. 10; non Bergh. 



In 1899 I descrihed a Peridinium, which together with P. ovatum 

 was one ol' the characleristie forms in an association of borcai 

 Peridiniaceae (» Longi- 

 pes - plankton«) ; my 

 description was not ac- 

 companied by figures, 

 hul in 1900 Cleve gave 

 somc figures ofit, which 

 are not, however, very 

 characteristic. (i ran 

 in his last paper supposes it to he identical with P. pellucidum 

 and gives under that name a ligure of it which is very good; but 

 the true P. pellucidum Bergh, which is founded on Danish speci- 

 mens, is very different from it. For comparison I have given 



Fig. 130. Peridinium pallidum Oslf. , a specimen Ironi the Danish 

 Waters near Ly6 in Lille Belt); the same cell in different views 



