WHAT ARE THE Y? 431 



Now let US took at the original Trochiscia momUfor- 

 mis and see what it may grow into. It appears as a little 

 sphère we must remember, attached to some submerged 

 alga or stone or wood. Instead of growing into a chain of 

 « frustules », as they are called, the growth take place lat- 

 terly and the development is into a dise. But it may also 

 develope several dises fastened one to the other, someti- 

 mes they are so shallow that they look like a number of 

 saucers placed in such a way that when veived together, 

 with the F. V. or front view as it is called shows. Then 

 they are composed of a number of liattened sphères. In 

 this form it as been described by a German botanist na- 

 med Ktitzing as Cyclotella scotica, because it was first 

 found on the coast of Scotland. He did not recognize it 

 as Trochiscia moniliformis, perhaps because he did not 

 hâve the publication which Roth issued. It was however 

 found by Montagne, a French botanist, at Callao, in 

 Peru..Kûtzing gives it under another name, but it is the 

 same as the figures show. He says that Trochiscia moni- 

 liformis is Podosira hormoides in which he places a new 

 name for the object and gives it as synonymous with 

 Melosira hormoides of Montagne. He also says it is the 

 same as Podosira nummuloides of Ehrenberg. Ktitzing 

 does not seem to hâve seen it at ail for he copies the figu- 

 res of Montagne and Ehrenberg. Ehrenberg founded the 

 genus Podosira to receive this form in 1840. 



Italso seemstohave been described as Cyclotella ligus- 

 tica of Kiitzing from the gulf of Genoa, Cyclotella maxi- 

 ma of Kiitzing from the coast of Chili and Peru. This is 

 first described as « in herb. Berol., 1842 » ; also as Podo- 

 sira jamaicensis of Kiitzing on a sea weed Enteromorpha 

 ramulosa at Jamaïca. The following forms can also be 

 given as synonyms. 



