Smith^ on Diatomacea. 
35 
34. Epithemia, &c. 
35. Cocconema cistula, &c. 
36. Cymbella Helvetica, &c. 
37. „ maculata. 
38. Fragillaria constricta. — Prepared by burning, 
39. „ „ Balsam ; on boiling in acid the 
filament is destroyed ; truly fragile. 
40. Hyalodiscus californicus. — Simply enclosed as good 
test for one-fiftli_, and to fill box. 
Note to No. 7. 
Within the small circle scratched on the cover will be found 
a very large and pretty Collotonema_, as yet rare here^ though 
abundant in gatherings made near Montreal^ U. C.^ by my 
friend Dr. Wormley. I have found it in the tubes_, and call 
it C. Sullivantia, in compliment to N. SuUivant^ Esq., of 
Columbus, O. I regret that the limited time I have had to 
prepare these notes makes them so brief, but hope ere long to 
communicate more fully. I have little doubt that I have 
completely traced the passage from the sporangial frustule to 
the parent, thus completing the broken chain. Within the 
large sp. frustule, which lies apparently dead for awhile, like 
a resting spore, there forms a perfect individual, subsequently 
free by opening of the sp. shell ; and in the three cases in 
which I have traced it, viz., Coc. lanceolatum, Gomph. 
acuminatum, and Navicula cuspidata, there was produced but 
a single frustule, just half size, from each sporangium. I am 
still investigating this point. 
T forgot to say a beautiful Amphiprora, much larger and 
finer marked than the A. paludosa of Smith, occurs sparingly. 
I hope to send specimens soon. I think it is A, ornata of 
Bail. 
