3 Dansk Botanisk Arkiv, Bd. 2, Nr. 4. 



Leram.; P. pillula (Ostf.) Lemm.; P. Manginii nov. nom. (syn. Diplop- 

 salis minima Mangin, non Perid. minimum Schilling); P. saecularis 

 (Murr, et Whitt.) nob. (syn. Dipl. saecularis Murray and Whitting); 

 P. Borgei (Lemm.) Lemm. (syn. Peridiniopsis Borgei Lemmermann); P. 

 Cunningtonii (Lemm.) Lemm. (syn. Peridiniopsis C. Lemm.). 



The P. assymetricum was found sparingly in the sample. 



P. conicum (Gran) Ostenfeld et Schmidt, 1. c, 1901, p. 174. 



Specimens agreeing well with the figures of P. conicum (Gran, 

 Rep. Norweg. Fisheries and Mar. Invest., vol. 2, No. 5, 1902, fig. 14} 

 were found in the sample. 



P. crassipes Kofoid, Univ. Calif. Publ. Zoology, III, 1907, p. 309, 

 tab. 31, figs. 46-47. 



I have taken one of Dr. Justesens drawings as belonging to 

 P. crassipes. 



P. depressum Bailey, Smithsonian Contrib. to Knowledge, VII, 

 Washington, 1855, p. 12, figs. 13-14. 



Seems to be common in the Boeton Strait. Dr. Justesen has 

 made several drawings of it and I have found it in the sample. 

 Probably several forms are included under this name. 



P. divergens Ehbg.; Paulsen, Medd. Komm. f. Havundersøg., 

 Ser. Plankton, I, No. 5, 1907, p. 16, fig. 23; P. speciosum Jørgensen, 

 1. c, 1912, p. 8. 



Both drawn by Dr. Justesen and found by me in the sample. 

 Seems to be common in the Boeton Strait. 



P. grande Kofoid, Bull. Mus. comparat. Zoology at Harvard 

 College, vol. 50, No. 6, 1907, p. 174, pi. 5, fig. 28. 



A drawing by Dr. Justesen seems to agree well with Kofoid's 

 figure. 



P. oblongum (Aurivillius) Cleve, K. Svenska Vetensk. Akad. 

 Handl., Bd. 32, No. 8, 1900, p. 20. 



I agree with Jørgensen (1. c, 1912, p. 6) in keeping P. oblongum 

 distinct from P. oceanicum. The drawing made by Dr. Justesen was 

 very like that by Schutt, Peridineen d. Plankton Exp., 1895, PI. 13, 

 fig. 44. 



P. oceanicum Vanhöffen, Grönl. Exp. d. Ges. für Erdkunde, 

 Berlin, Bd. II, Teil 1, 1897, tab. 5, fig. 2; P. elegans Cleve, K. Svenska 

 Vetensk. Akad. Handl. Bd. 34, No. 1, 1900, p. 16, pi. 7, figs. 15, 16. 



To this species I refer 

 the very flat, long-horned 

 form which I have drawn 

 from a specimen found in 

 the sample (Fig. 1); it was 

 150 |u long and 110 ja broad. 

 P. pentagonum Gran, 

 Rep. Norweg. Fisheries and 

 Mar. Invest., vol. 2, No. 5. 



„. 1 D ... . v , .„ 1902, p. 190, fig. 15. 



Fig. 1. Perulimum oceanicum Vanhon., a form xxr'fu *\ • • t k 



from the Boeton Strait, a, dorsal view; b, ven- Wltn tms species 1 have 



tral view; c, side view; d, apical view. (ä££). identified one of Justesen's 



