139 



larian which F. T. Kùtzing calls in Bacillaria odor Diatomaceen, 18.44 

 Synedra quadrali gula, or near to that. 



Il is minute without markings of an}' kind or a so callcd « me- 

 dium line » and « direct » ; that is lo say vvilh almost paraliel sides 

 on the valve view and also when il is veiwcd on the other side. 



Synedra quadranguìa is published on page 63 and figured in 

 Taf. 3. XXIII. Il is strange to say noi published by any other author ('j. 



It is found on or with Conferva on the Norwegian coast but 

 wether in brackish, fresh or salt water is noi mentioned. Mesi li 

 kely in salt water. I found it first in the fresh water in a small 

 stream in Branch Brook Park in Newark, New Jersey as well as in 

 fresh water pools in Grange and Newark, New Jersey and also in 

 the clay which was damp noi wel in other parts of Newark. Kùt- 

 zing says it is « minutissima, altero latere angustissime linearis, altero 

 subolique quadranguìa lata ». But one of the forms that appear, is 

 more common than that which is called quadranguìa is what Kùtzing 

 calls Synedra ? niinutissima. In fact they both occur together. They 

 are formed at the same lime and both from an amoeboid particle 

 but whether the quadranguìa comes first the minutissima I can noi 

 say, but suspect that the minutissima is first formed as it is most 

 rounded in culline and the amoeboid form is rounded also, and the 

 quadranguìa is noi so. 



At any rate they seem to change one into the other and can 

 be seen to do so, Synedra is pul down with the marks of a query (.^) 

 after it showing that the author doubts whether he is righi in placing 

 it in that genus and that il does not confirm lo Synedra being 

 more rounded and also haveing a very faint « median line » l'or Sy- 

 nedra has no such a thing although I cannot see the two « termi- 

 nal » and one « median dots » asthey are called. These also appears 

 sometime a change into Synedra perpusìlla. This is noi so much 

 rounded and has no «median line». And also Synedra biasolettiana 

 and Synedra pusilla, These are both more rounded. These are found 

 at Bac. page 63. Tab. 3. fìg. XXX. lab. 3. Fig. XXI, Tab. 3. Fig. XXII. 

 and Tab. 3. Fig. XXIX. Now ali of these J bave seen appear in the 



(^) N. d. Dir.: La diagnosi è ripubblicata in Dk Toni, Sylloge Algarmn, 

 II, pag. 668. 



