28 P. T. CLEVE. PLANKTON OOLLECTED BY THE SWEDISH EXPEDITION TO SPITZBERGEN. 



Challengeria Harstonii J. Murray. 







Deep-sea 



hauls: 







Date. 



Ut. N. 



Long. 



Depth. 



Fq. 



Pl. 



29— 30 VII 



27 VIII 



1 IX 



78° 13° 

 79° 58' 

 75° 50' 



2°58'W. 



9° 35' É. 



15° 25' E. 



2,600-0 m. 

 400-0 . 

 326-0 » 



r 

 r 



sc 

 se 



s 



Habitat: The abysmal depths east of Japan. 



C. tridens Hkl. 



Surf ace : 



Deep-sea hauls: 



Date. 



Lat. N. 



Long. 



Temp. 



Sal. 



Fq. 



Pl. 



29 VIII 

 IIX 



77° 38' 

 76° 2' 



11°40'E. 

 13° 8'E. 



6 

 6,Öl 



34,89 

 35,13 



7' 



r 



TS 

 TS 



Date. 



Lat. N. 



Long. 



Depth. 



Fq. 



Pl. 



29—30 VII 



78' 13' 



2°58'W. 



2,600—0 ra. 



r 



CS 



27 VIII 



79° 58' 



9° 35' E. 



400—0 . 



r 



cs 



1 IX 



75° 50' 



15°25'E. 



325—0 » 



r 



s 



5 IX 



71° 50' 



19° 2'E. 



230—0 . 



r 



s 



Habitat: Färöe Channel. 



Challengeron Nathorstii Cl. N. sp. Shell ovate to subspherical, with a single spine 



at the apical pole, as long as the radius of the shell or longer. Diameter of the mouth 



half as long as the diameter of the shell. Structure: regular hexagonal alveoli, quincun- 



cially arranged in obliquely decussating rows (3 in 0,oi mm.). Peristoine tinely punctale, 



with two long and pointed, hollow, almost parallel horns, and below each of them a 



triangulär or ovate hole. 



Diameter of the shell 0,06 to O, os rara. Pl. I, f. 9 a. ¥ig. 9 b stnioture. 

 The nearest relative is C diodon fVora the south-easteru Pacific Ocean. 







Deep-sea 



hauls: 







Date. 



Lat. N. 



Long. 



Depth. 



Fq. 



Pl. 



27 VIII 

 5 IX 



79° 58' 

 71° 50' 



9°35'E. 

 19° 2'E. 



400-0 m. 

 230-0 . 



»•!• 

 ,.j. 



SC 



s 



Habitat: Surface, 64° 25' N.; 11° 50' W. lOth March 1899. 



Collozoum inerme (J. Mull.). 



Surface : 



Date. 



Lat. N. 



Long. 



Tctnp. 



Sill. 



Fq. 



Pl. 







9 VI 



10 VI 

 10 VI 



70° 54' 

 71° 10' 

 71° 42' 



20°43'E. 

 21°31'E. 

 22°35'E. 



7,15 

 6,71 

 6,40 



34,83 

 35,20 

 35,15 



r 

 c 

 r 



C{S) 

 CS 

 TC 



Habitat: Cosraopolitan, comraon in all warmer seas (Mediterraneaii, Atlantic, Indian and Pacific) Wmckel. 

 Not rare in the styliplankton of the eastern Atlantic (Cl.). 



