409 



carps occur scattered, solitary or a few together upon the same 

 joint. DAVIS has 1. c. described their development. 



This plant was found with tetraspores in the months Janu- 

 ary to March and with antheridia and cystocarps once in Feb- 

 ruary. 



It occurred in shallow water both in sheltered and in more 

 exposed localities and in deep water down to a depth of about 

 20 fathoms. In deep water and 

 in sheltered localities, for in- 

 stance in lagoons, the plant is 

 slender and the joints rather 

 long, in more exposed places it 

 is more robust with short 

 joints. 



St. Croix: Christianssted's 

 Lagoon, Christianssted's Harbour, 

 oft Frederikssted, Krause's Lagoon. 

 St. Jan: Off America Hill, off 

 Ramshead. 



Geogr. Distrib.: Warmer 

 parts of the North-atlantic Euro- 

 pean and American coasts, Me- 

 diterranean Sea. 



G , n v-O'^Cv^ 



%% 



<?> 



eo 



'. 393. Champia parvula (Ag.) Harv. 

 .4, part of the wall seen from above 

 and B, transverse section of the wall 

 of a male plant (350:1). 



2. Champia salicornoides Harvey. 



HARVEY, W. H., Nereis 

 Bor.-Am., p. 76, tab. XIX B. 

 AGARDH, J., Epicrisis, p. 305. 



This species bears a rather close resemblance to Champia 

 parvula not only with regard to its outer habit, but also in its 

 anatomy. BIGELOW has pointed this out in his paper quoted above 

 on p. 118. But Champia salicornoides is a much bigger plant and 

 when examined more thoroughly, some anatomical differences 

 also become apparent. 



The peripheral wall of the frond consists of a single layer of 

 cells, seen from above rectangular polygonal, about l j /a to 2 times 

 as long as broad ; in transverse section the cells are nearly square- 

 shaped. The cells have a rather thick peripheral wall which 

 swells greatly in water. The diaphragms between the joints of 

 the thallus consists of a single layer of cells of irregular, polygonal 



