69 



tic coast, and vvhich seems to be left by the iceberg which prc- 

 vailed in the Glacial period. It includes Pinmdaria macilenta C. G. 



E. 1844 Abhand. 1844, and Navicula macilenta C. G. E. i838. Inf. 

 T. XXX, f. XIII. Also fig. 18-20-25-29. 



It must now be called Navicula and oblonga for Kùtzing de- 

 scribed it (and figured it) in k\g. Dee. 1884, "■ §4 He also figurcs 

 and describes it in Bac. 1844, p. 97, T. 4, fig. XXI, Ile says there it 

 is a Navicula macilenta C. G. E. i838, Inf. T. XXI, fig. XII. It has 

 the striae sometimes in bars and sometimes the bars can easily be 

 broken up into nodules like in the typical Navicula. It includes Na- 

 vicula {Pinnularia) peregrina C. G. E. which is common ali along 

 the coast in brackish (marine.^) water. It comes there by transmis- 

 sion from fresh water and was brought down by the iceberg in the 

 Glacial period. 1 do not know how far the name can be made to 

 include ali of those which are figured on Planch. VII. Van Heurck 

 Syn. Dia. Bel., but it can most likely. 



And those in Planche VII, I think it can be found that when 

 Navicula oblonga passes into brackish watei it becomes Navicula 

 peregrina. When in marine, or salt water as it is common but 

 it becomes fixed, perhaps it is influenced by the waves dashing 

 upon the shore or at any rate by some thing which we bave not 

 surmised as yet, it forms a tube and therefore becomes a Schi\onema. 



There also seems to be an Epithema which looks like musculus 



F. T. K. There is an indentation at the centre of the convex side 

 of the valve, also it is larger than Epithemia musculus F. T. K. 



So much for the Bacillaria in the speciiTiens which 1 bave be 

 able to procure from the Occidental Sea as I judge it forms the Le- 

 lano Estacado or Staked Plain. They are shown thus on the south 

 east. They are shown on the west at Mono Lake in California, in 

 the middle by the at Lakes Bonneville and Lahontan. On the north 

 1 have them from Oregon and Washington, part of which I bave 

 already described and part I have stili to describe. I have them 

 form Cache Lake, California, which I will detail hereafter but I have 

 them not as yet from the British Possessions. 



<s=<s> 



