;i:;() 



DIATOMACI...]-, — I'liRAGALI.OA, KHlZOS{)Li:.\'IA 



Temperature: s.s, mean of 2() obs., max. 21. t, min I .i^ 



Salinity: Ik'),!!, mean of 2() obs., max. Hli.i.s, min. 3H.5». 



Planlcton-type. This principal area of distribution is between 



Scotland, Iceland and (ireenland, wliicii together with the mean sali- 



nily seems to prove that it belongs to the Chietoplankton. The var. 



X. fraudiilcnia is noted from the Mediterranean. — ('. 



PERAGALLOA MERIDIANA Scm tt. 



{\'a\ Heurck: a Treatise on the Dialomacece pag. il'.t. — I'rrni/allia tropiin 

 ScHUTT Engl. & Prantl. I), nat. Pflanzenfamilien 1, 1. b: pai. 86. 



lSi)8 February: 12' N. 71° W. 

 October: 21° S. m° AV. 



Temperature: 27 to 22. 

 Salinity: 37.21 (one obs.). 

 Plankton-type: 1) or Xr. 



Remark. Si:h(;tt does not say anything about the habitat of 

 this form, but Van Heurck indicates the Baltic, which must be erro- 

 neous. It seems to me questionable whether this form not be an 

 anomalous Clin'tneei-<)>i periiridinix. 



RHIZOSOLENIA (TEMPEREI VAR.) ACUMINATA I'F.uAf.Ar.Lo. 

 (Le Diatomiste 1892 PI. XV lig. 4.) 



1898 January: V N. 53" W. 

 I^ibruai-y: 5 S. 9- E. 

 (Jctober: Azores. 



November: Rio Janeiro; Azores. 

 December: Azores. 



1899 Jane: 14° S. 6° W. 



Temperature: 28. «, mean of 7 obs., max. 29. s, min. 17.2. 



Salinity: 35. is, mean of 4 obs., max. 36. hk, min. 33. si. 



Plankton-type. This form, which is noted also from the Me- 

 diterranean and the Pacific, occurs along the coasts of the tropical 

 Atlantic, east and we.sl. — ,V/. 



