PLATE XXIII. 



[Proc. Wash. Acad. Sci., Vol. II, PI. XIX.] 

 (All figures drawn by aid of a camera lucida except ja, n, 12, and 13.) 



FIG. i. Menipea erecta 6p. nov. Frontal view, showing bifurcation of an inter- 

 node and main points of structure; spine (5^.), operculum (0/-) 

 frontal avicularia (_/". .), oecia (a?.), and mode of articulation (ar/.). 

 3. Dorsal view of the same, showing the radical fibers (r. /.) and the 

 place of their attachment upon the zoecia. 



3. Scrupocellaria scabra Van Beneden, frontal view. 



4. Dorsal view of the same, showing absence of vibracula. 



[336] (244) 



