DIATOMACE^K — DITYLU.M, ETHMOOISCUS y>2f> 



DITYLUM BRIGHTWELLII West. 

 I Van Heurck Syn. PI. CXIV fig. 4-9,. 



J SOS March: ■2-\' N. 17'- W.; 1-S^ N. H^ W. 



April: 'I'r N. Uf W.; W"" N. ;r AY. 



Aiitjiif<r: ."if)- X. ")'' AV. . 



January: \i° N. (>!)" W. 

 ISOil J/ft^: H(P N. I" W. 



Temperature: lo.r,, mean of 7 obs., max. 17, min. H. 



Salinity: 3i.85, mean af \- obs., max, 35.s2, min. Mm. 



Plankton-type. This species is very common in the English 

 Channel, the North Sea and the Skagerak. Its rare occurrence in 

 the Atlantic and the low salinity prove that it is a neritic form. 

 ()(:curs in Puget's Sound. — Xin. 



DITYLUM SOL. 



{Trir. Sol. A. Schmidts Atlas d. Diat. K. PI. CLIl Jig. -i, 5, 7—9). 

 ISilS June: 10- X. n^V AV. 



Temperature: '27.2. 

 Salinity: Bti.oi. 



Plankton-type. Noted from the (iulf of Bengal, Java, Hong- 

 kong. — Xt. 



»ETHMODISCUS SP.» Castr. 

 (.Challenger Exp. Diat. PI. XIV li)r. i). 



1897 Drccnibcr : H2^ N. ;!;-(- W. 



1898 February: IH^— Ki^ N. 70^— 7 1'' W. 

 March: 83^ N. :-!2^ W. 



May: m° N. i2° W. 

 October: 2\.° S. ;',()" W. 



1899 January: 55° N. 19^ W. 

 April: 28° N. 75'^ W. 



Temperature: 21.«, mean df 7 obs., max. 27, min. 12. 

 Salinity: Hti.in, mean of 4 obs., max. 87. 21, min. 85.o4. 

 Plankton-type. Fragments only have been found of this 

 species, remarkable for its fine and characteristic structure. — 1). 



