972 



CLEVE, SOME ATLANTIC TINTINNODEA. 



Temperature: 20 to 28, lower exceptioiially. 



Salinity: 36 to 37, exceptionally 34. 



This species resembles Tmtinnus spiralis Fol. {Undella 

 spiralis V. Daday), which is described and figured as having a 

 Single row of puncta between each pair of ribs, which besides 

 are closer. The apophysis, which characterizes the variety, is 

 of no specific value. There is another species, viz. Cyttarocylis 

 Treforti V. Dadat, which is remarkable for a similar apophysis, 

 but in the Atlantic there occurs by no means rarely a form 

 withouth apophysis, but in all other respects similar to the Me- 

 diterranean form, as described by VON Daday. 



Fig. 225 times magnified. 



end 

 (14 



Cyttarocylis nervosa n. sp. 



House campanulate, gradually widened from the acute apical 

 towards the teethless rnouth, with more or less numerous 

 to 18) longitudinal and anastomosing ribs. 



Length: 0,09 mm. Diameter of the mouth: 

 0,055 mm. 



Hahitat: the Sargasso Sea (27° N. 37° W. 

 March 1898) and west of South Africa (25° 

 S. 7° E. April 1899), extremely rare in desmo- 

 plankton. 



Temperature: 19 to 19,5. 

 Salinity: 35,77 to 37,04. 

 Fia. 450 times magnified. 



Cyttarocylis simplex n. sp. 



House conical, twice as long as broad, with distant (about 

 9) longitudinal ribs. End obtuse. Mouth simple, teethless. 



Length: 0,07 mm. Diameter of the mouth: 0,035 mm. 



Hahitat: west of South Africa (20° S. 1° E. June 1899). 

 the north equatorial current and the Sargasso Sea (December 

 1897 and June 1898), the Florida Current (April, July 1898). 

 At 41°— 43° N. 69°— 61° W. (August, November 1898) and 



