9 6 
The Ohio Naturalist. 
LVol.VII, No. 5, 
Literature. 
Agardh, J. G. 
1867. De Laminariaceis. Lunds. Univ. Arsskrift. 
Griggs, R. F. 
1906. Renfrewia parvula, a New Kelp from Vancouver’s 
Island. Postelsia 1906 : 247. 
Kjellman, F. R. 
1893. Laminariaceae in Pflanzenfamilien 1:2:242-260. 
MacMillan, C. 
1899. Observations on Nereocystis. Bull. Torr. Club 26:273. 
1901. The Kelps of Juan de Fuca. Postelsia 1901:193. 
Mueller, Olga. 
1904. Observations on Laminaria bullata Kjlm. Minn. Bot. 
Stud. 3:303. 
Postels and Ruprecht. 
1840. Illustrationes Algarum. 
Reinke, J. 
1903. Studien zur Vergl. Entwickelungsgeschichte der Lam- 
inariaceen. Kiel. 
Stechell, W. A. 
1891. Concerning the Life History of Saccorhiza dermato- 
dea. Proc. Am. Acad. 26:117-217 PI. 1 and 2. 
1905. Post Embryonal Stages of Laminariaceae. Univ. Cal. 
Pub. Bot. 2:115-138 PI. 13 and 14. 
Setchell, W. A. and Gardner, N. L. 
1903. Algae of Northwestern North America. Univ. Cal. 
Pub. Bot. 1:165-418. PI. 17-27. 
De Toni, J. B. 
1895. Sylloge Algarum. 3:136-374. 
Yendo, K. 
1903. Three New Marine Algae from Japan. Bot. Mag. 
Tokvo. 17:99-104. PI. 2 and 3. 
Explanation of Plate VII. 
Photographs of juvenile forms of Cvmathere triplicata taken 
by transmitted light. Figure? 2-8 about three times natur¬ 
al size brightened in places with a pencil to bring out the con¬ 
trast. Figure 9 natural size also slightly retouched. 
Fig. 2. The smallest specimen found. 
Fig. 3. The largest before the appearance of the adult lamina 
Fig. 4. The first appearance of the several layered lamina. 
Figs. 5-8. Progressive series up to the beginning of the 
folding which has just commended in fig. 8. 
Fig. 9. A specimen showing the two ribbed condition; the 
original groove between them has not vet begun to flatten to form 
the third ridge; at the tip are the remnants of the embryonic 
lamina. 
