96 The Ohio Naturalist. [Vol. VII, No. 5, 



Literature. 

 Agardh, J. G. 



1867. De Laminariaceis. Lunds. Univ. Arsskrift. 

 Griggs, R. F. 



190(>. Renfrewia parvula, a New Kelp from Vancouver's 

 Island. Postelsia 1906 : 247. 

 Kiellman, F. R. 



1S93. Laminariaceae in Pflanzenfamilicn 1:2:242-260. 

 MacMillan, C. 



1899. Observations on Nereocvstis. Bull. Torr. Club 26:273. 

 1901. The Kelps of Juan de Fuca. Postelsia 1901 :19:5. 

 Mueller, Olga. 



1904. Obser\'ations on Laminaria buUata Kjlm. Minn. Bot. 



Stud. 3:303. 

 Postels and Ruprecht. 



1840. lUustrationes Algarum. 

 Reinke, J. 



1903. Studien zur Vergl. Entwickelungsgeschichte der Lam- 

 inariaceen. Kiel. 

 Stechell, W. A. 



1891. Concerning the Life Historv of Saccorhiza dermato- 

 dea. "Proc. Am. Acad.' 26:1 17-217 PI. 1 and 2. 



1905. Post Embrvonal 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. 

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1903. Three New Marine Algae from Japan. Bot. Mag. 

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Explanation of Plate VII. 



Photographs of juvenile forms of Cymathere triplicata taken 

 by transmitted light. Figures 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 slightlv retouched. 



Fig. 2. The smallest specimen found. 



Fig. ;>. 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 tig. 8. 



Fig. 9. A specimen showing the two ribljed condition; the 

 original groove between them has not yet begun to flatten to form 

 the third ridge; at the tip arc the remnants of the cmbrvonic 

 lamina. 



