ltlAI'i).\lA( I'.i; l!HI/()S()LKMA .^4") 



Jiitii': (if) \. I W. to (H)^ N. i:} W.. at some spots common; 

 72 .\. W W., rare; 7:-i N. I W., rare; 77- N. 14 K. and 

 f)2^ N. 2 K.. rare. 



Scprciiihi'r: 80 X. lo- K., very rare. 



♦ 



Temperature: »).,., mean of lo obs., max. i:5..-,. miii. — I..i. 



Salinity: ;}(.•...->, mean of i2 obs., max. ;5o. ,;.-,, min. ol.-.s, excep- 

 tionally 2»).:,i. 



Plankton-type. SchrOdkr mentions il fi-oiii Naples. — 7". 



RHIZOSOLENIA ROBUSTA .Norm. 

 I>i;ha(.ali.o; le Diatomiste Tl. XIV fij,'. 1). 



IS'.IS Januanj: 12^ N. 19' \V.; 21^ N. 17^ W. 



February: 5^ S. 9° K.; 13 N. 70 W. 



March: IS' N. Kv W.; 21 X. IS- W.; 28' X. 17 AV.; 10" 

 X. 53 W. 



April: 50° N. 3' W. 

 IS<I<) April: 9' N. 59' AV. 



Jiun': V S. 19 AV. 



Temperature: 21. mean of 11 obs., max. 27,:!, min. 12. 



Salinity: iM.!!.;, mean of 3 obs., max. 35. .jo, min. o3..).i. 



Plankton-type. Xoted from the Mediterranean. Java and the 

 Pacific. It occurs in the tropical Atlantic, both west of Africa and 

 north of South America and seens to be of neritic hahitat. - Xt. 



RHIZOSOLENIA SEMISPINA Hk.vsin.' 



ii'iinfte Hor. Ivomni. in KicM fiir 1S82— 86 PI. V lig 3\)). 



isiis Jamuirii: 33' N. 31 W.. rare; 48' X. fi' W., rare. 



March: 48' N. IS'* W.; 53^ X. 20"^ W.; 48' X. ti W. to il 



X. 21' W.; 43^ X. 45' AV. to 40' N. 71^ W. 

 Ajiri/: 73-" X. 5' W.. not i-are; Faroe Channel, nol rare; tiO' 



X. 19- \V. to 59 X. 30' W.; rare at the south end of (u-een- 



land; 44 X. U) AV. to 40' N. 70' \V. 



' Oistonfeld's data used. 



