30 
BOTANY: D. H. CAMPBELL 
proportion to the area of the basin of the lagoon, and we know from the 
studies of Guppy, Wood- Jones, and Vaughan that many lagoons are 
filling up with sediment. In fact calcium carbonate is being precipi- 
tated from the sea-water of the Florida-West Indian region in the 
manner determined by Drew^ and Kellerman and Smith ;^ the precipi- 
tate finally changing into oolite as observed by Vaughan.^ 
1 Murray, J., Edinburgh, Proc. R. Soc, 10, 505 (1880). 
2 Agassiz, A., Numerous paper in the Bulletins and Memoirs oi the Museum of Compara- 
tive Zoology at Harvard and a general statement, London, Proc. R. Soc, 71, 412 (1903). 
^ Dole, R. B., The Carnegie Institution of Washington, Publication No. 182, Papers from 
the Tortugas Laboratory, 5, 711 (1914). 
" Tashiro, S., Year Book of the Carnegie Institution of Washington, No. 13, p. 220 (1915). 
^Vaughan, T. Wayland, Publication No. 182, The Carnegie Institution of Washington, 
p. 62, (1914); also 1914; Bull. Geol. Soc. Amer., 26, 58 (1914). 
^ Elschner, C, The Leeward Islands of the Hawaiian Group, Honolulu, p. 48, (1915). 
^ Drew, C. H., Carnegie Institution of Washington, Paper from Tortugas Laboratory, 
5, 7-45 (1914). 
8 Kellerman, K. F., and Smith, N. R., Washington, J. Acad. Sci., 4, 400 (1914). 
^Vaughan, T. Wayland, Carnegie Institution of Washington, Publication No. 182, 
p. 47-54 (1914). 
THE ARCHEGONIUM AND SPOROPHYTE OF TREUBIA 
INSIGNIS GOEBEL 
By Douglas Houghton Campbell 
DEPARTMENT OF BOTANY. STANFORD UNIVERSITY 
Read before the Academy, November 16, 1913. Received November 15, 1915 
Treuhia insignis is a remarkable liverwort discovered by Goebel in 
Western Java. It is one of the largest and most striking species known 
and is of special interest as being in some respects the nearest to the 
typical leafy liverworts of any of the ' anacrogynous' Jungermanniales. 
For some time after its discovery Treubia was known only from the 
original locality near Tjibodas on Mt. Gedeh in Western Java. It has 
since been discovered in several widely separated regions, e.g., New 
Zealand, Tasmania, Patagonia, Tahiti, and Samoa. In May 1913, I 
collected a single specimen on Mt. Banajao in Luzon, Philippine Islands. 
The present paper is based upon material collected at the original 
station (Tjibodas), in 1906. The material comprised female and sterile 
plants with gemmae, but no male plants were found. 
The archegonia are in groups, up to a dozen, protected by the char- 
acteristic dorsal scales which occur at the base of each leaf. 
The development of the archegonium is much like that of other Kver- 
worts, but shows one striking difference — instead of the usual five or six 
rows of peripheral cells in the neck of the archegonium, there may be as 
