P. T. CLEVE. PLANKTON, COLLECTED BY THE SWEDISH EXPEDITION TO GREENLAND. 



Some rarer forms have been excluded from the 

 Thusanoessa longicaudata KRÖYER (fide G. O. SÄRS.) 



St. C. 200 r; Stat. E. 200 r. 

 Euthemisto UbeUula Mandt. St. E. 100 and 200 r. 

 Acartia Clausii GlESBR. St. B. 100 r. 

 A. longiremis LlLLJEB. St. B. r. 

 Metridia hibernica Brady & ROBT. St. B. 100 and 150 r. 

 Conchoecia borealis G. O. Särs. St. E. 200 r (fide 



G. Andersson). 

 C. elegans G. O. Särs. St. E. 500 r (fide G. ANDERSSON). 

 Cyttarocylis denticulata EHB. St. B. and 150 »■; 



St. D. 100 f. 

 Acanthometron quadrifolium HKL. St. B. 400 rr. 

 Acanthonia Miilleri HKL. St, B. 100 r. 

 ( erafium reticulation POUCHET. St. B. 25 rr. 

 Peridinium oeeanicum Vanh. St. B. 25 and 50 r. 



Table III, viz: 



P. pallidum OsTENF. St. B. 400. 



Pterospha>ra Möbii JÖRGENS. St. B. 10 r; St C. 10 r. 



Xanthidium multispinosum MOEB. St, B. 100 r. 



Chcetoceros borealis tar. Brightwellii Cl. St. B. 1 50 r. 



C. borealis var. solitaria Cl. St. E. r. 



C. scolop>endra Cl. St. D. r. 



C. teres Cl. St. D. 150 r. 



Corethron hystrix Hensen. St. E. r. 



Rhizosolenia alata Btw. St. D. 550 r. 



R. obtusa Hensen. St. D. 25 r. 



Thalassiosira gelatinosa HENSEN. St. D. 200 r. 



Chiridius armatus (BOECK) G. O. Särs, is according 

 to Prof. G. O. Särs the same as Euchaita arrnata 

 Boeck. The dctermination is after comparison with 

 specimcns from Lofoten, kindly sent by Prof. Särs. 



3. Samples collected in July. 



During July the »Antarctic» passed the region of drift-ice, close to the east coast 

 of Greenland, between 74° 29' and 70° 31' N. The plankton from the surface was, as could 

 be expected, as a rule scarce. The temperature of the water varied from 1,1 to — 0,9, 

 and the snlinity from 7,78 to 32,87. The organisms, which constitute the plankton, were as 

 a rule arctic species, but southern forms also oecurred to a small extent. Among the arctic 

 forms a considerable percentage consist of neritic or brackish water forms. 



As arctic oceanic forms I consider the following: 

 Fritillaria borealis Lohm. rr. 

 Beroé 74° 34' N. 18° W. (fide T. S. Arfwidson). 

 Cyttarocylis gigantea BRANDT rr 

 Phceocystis Pouchetii Lacii. rr. 

 Chatoceros atlanticus rr. 



C. borealis Btw. rr. 



var. Brightwellii rr. 

 C. decipievs Cl., in most samples, r to c. 

 Coscinodiscus oculus iridis EHB., in most samples, r to c. 

 Thalassiosira gravida Cl., as a rule not rare. 



As arctic, more or less neritic, forms I consider the following: 

 Clione. limacina Pinrrs: 7 T 30' N. 21° W. and 72° 28' N. Cluvtoceros Granii Cl. rr. 



21*48' W. (fide T. S. ARFWIDSON). C. septentrionalis OESTR. rr. 

 Limaoma helioinä PHIPPS: 73° 28' N. 21° 48' W. (fide C. socialis Lauder, common at somo spöts. 



T. S. Arfwidson); 74° N. 14 30' W. r. C. teres Cl. rr. 



Ptychocylis obtusa BRANDT rr. Coscinodiscus radiatus ElIB. 



Tintinnua minutus Hrandt rr. Eucampia yrönlandica Cl, rr. 



Cerafium longipea IJail. rr. Fragilaria oceanica Cl. rare to vert/ abundant. 



Peridinium ovatum POUCH. rr. Lauderia fragilis Gran. rr. 



/'. pellueidum BEROB rr. Melosira (nummuloides var.) hyperborea Grun. rr. 



Amphiprora hyperborea Grun. rr. Navicula septentrionalis Oestr. rr. 



Chcetoceros bottnicus Cl. rr. Nitcschia frigida GRUN. rr. 



< '. fnrcellatus Bail. r to c. Thalassiosira Nordenskiöldii Cl. /■. 



