RADIOLARIA — TETRAPi'LE, THEOCALYPTRA 193 



TETRAPYLE QUADRILOBA Ehb. 

 {Schaoinma quadr. Ehb. Abh. d. Berl. Akad. 1872 PI. X fig. 12—14.) 



1898 January: 7° N. 53° W.; 15° N. 70° W. 

 February: 21° N. 74° W 



March : 10° N. 53° W. 

 November: 19° N. 58° \Y 

 December: 25° N. 54° W 



1899 June: 12° S. 9° W. 



Temperature: 25. e, mean of 7 obs., max. 27.5, min. 22. 

 Salinity: 36.36, mean of 3 obs., max. 37. i?, min, 35.22. 

 Plankton-type. Found in the Atlantic, Mediterranean, Indian 

 and Pacific. — D. 



THEOCALYPTRA CORNUTA (Bail.) 

 (Carpocaniuin cahjpira Ehb. Abh. d. Berl. Akad. 1872 pag. 287 PI. II fig. 9.'; 



1898 March: 63° N. 2° E.; 71° N. 1° W, 



July: 78° N. 3° W. (deep sea haul). 



August: 80° N. 10° E. (deep sea haul). 



September: 76° N. 15° E. (deep sea haul). 



November: area between 56° N. 26° W.; 52° N. 38° W. and 

 55° N. 44° W. 



December: 41° N. 66° W. 

 1889 March: 65° N. 13° W. 



October: 53° N. 31° W. 



November: 51° N. 21° and 34° W. 



Temperature: 7.?, mean of 9 obs., max. 22, min. 2.8. 



Salinity: 30.02, mean of 9 obs., max. 35.36, min. 34,72. 



Plankton-type. Found in bottom-mud from Kamtchatka and 

 Greenland. The non occurrence of this species in the southern 

 Atlantic and its occurrence at Kamtchatka, as well as the low tem- 

 perature, point to the conclusion that this species arrived ultimately 

 from the northern Pacific through the Polar basin. 



13 



