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



Globigerina 11 r. 



Ceratium (tripos var.) bucephalum Cl. 10 rr, 18 r. 



C. lineatum EHB. 4 r. 



Dinophysis acuta EHB. 7 r, 10 rr. 



Peridinium divergens EHB. 10 rr. 



Xanthidium hystrix Cl. 1 rr. 



Cerataulina Bergonii H. Per. 8 rr, 17 rr. 



Chcetoceros atlanticus Cl. 2 r. 



C. borealis var Brightwellii Cl. 12 r. 



C. constrictus GRUN. 3 cc, 5 + , 1 5 r, 1 8 r, 



C. contortus SCHUTT. 3 +. 



C. curvisetus Cl. 5 r. 



(7. danicus Cl. 3 cc, 5 cc. 



C/fvtoceros scolopendra Cl. 12 r. 



C. teres Cl. 12 r, 15 r, 16 r. 



Coscinodiscus concinnus W. Sm. 2 r, 6 + , 9 r. 



Lauderia annulata Cl. 1 1 r. 



Nitzschia seriata Cl. 3 r. 



Rhizosolenia alata Btw. 1 1 rr. 



R. gracillima Cl. 8 + , 9 rr. 



R. obtusa HENSEN 12 r, 14 r, 18 r. 



R. semispina HENSEN 5 c, 13 r, 14 r. 



R. Shrubsolei Cl 9 rr. 



R. Stolterfothii H. Per. 10 rr. 



Thalassiotrix Fraueufeldii GRUN. 3 c, 5 c. 



T. longissima Cl. & GRUN, 6 r. 



2. Samples collected in June. 



The route was över the northern slope of the 200 metre plateau towards the Nor- 

 wegian depth to the channel between Iceland and Jan Mayen and, after a short stay ät 

 this island, north thereof towards E. Greenland. 



There prevailed in the surface, above of the 200 metre plateau, tricho-plankton, 

 containing Calanus jinmarchicus, Bhizosolenia semispina, and Chcetoceros criophilus. Above 

 the deepest part of the Norwegian depth there ruled 35 p. m. water (3,9 to 4,6 temp.), 

 with typical chrnto- plankton, that contained Collozoum inerme abundantly at some spöts. 

 The water of 34 p. rn. salinity (3,43 to — 0,35 temp.) in the channel between Iceland 

 and Jan Mayen contained sparingly triclio-plankton. Round San Mayen there ruled also 

 34 p. m. water, containing chiefly Phmocystis Pouchetii (Qi or perhaps more correctly T). 



The hydrographical data and the plankton-contents have been registered on 

 Table II, from which I have excluded some sterile, or nearly sterile samples, viz: 



Sal. 33,8i. Contained Phceocystis Pouchetii r. 

 Chcetoceros criophilus r. 

 Number 31—29 VI. 73^ 51' N. 7° 15' W. Temp. 



— 0,5. Sal. 33,78. Contained Melosira hyper- 

 borea + , Rhizosolenia semispina r. 



» 32—30 VI. 74° 28' N. 13° 24' W. Temp. 



— 0,6. Sal. 33,66. Sterile. 

 33— 30 VI. 74° 33' N. 14° 35' W. Temp. 

 + 0,3. Sal. 32,75. Contained Calanus Jin- 

 marchicus + , C. hyperboreus r, Clione lima- 

 cina r. 



Number 9—6 VI. 67° 35' N. 6° 19' W. Temp. 0,75. 

 Sal. 34,93. Contained Globigerina + . 

 12— 8 IV. 68"21'N. 12° 9' W. Temp. 0,25. 

 Sal. 34,72. Contained Oithona similis r, Glo- 

 bigerina r, Rhizosolenia gracillima rr. 

 » 13 — 8 VI. 69° 9' N. 13 10' W. Temp. 



— 0,35. Sal. 34,8i. Contained Parathemisto 

 oblivia + , Oithona similis + . 

 16 — 9 VI. 69* 54' N. 13° 30' W. Temp. 0,2. 

 Sal. 34,83. Contained Phoeocystiå Pouchetii r. 

 29— 26 VI. 72 39' N. 5° 26' W. Temp. 1,15. 



The following species have been omitted: 

 Parathemisto oblivia Kröyer 17 v, 

 Acartia Clausii GlESBR. 1 and 2 +. 

 Calanus hyperboreus Kröyer 18 rr. 





Pseudocalanus elongatus Boeck. 6 and 11 r. 

 Temora longicormis O. F. MULL. 2 + . 

 Krohnia hamata MOEB. 6 r. 



