TRIBE II. C ARYOPH YLLACE A. 413 



without; within, calicles crowded, short, subcylindrical or globoso- 

 conical, cells deep, aperture to of a line wide. 



Plate 30, fig. 10, corallum, showing its form, and a single lobe with 

 the calicles, natural size; 10 a, appearance of an animal partly ex- 

 panded ; 10 b, section of folium enlarged ; 10 c, surface magnified. 



Feejee Islands. Exp. Exp. 



This species grows in clusters of leaves nearly erect, some of which 

 are six or eight inches high, and four or five broad, much bent and 

 curved, and not unfrequently lobed. The thickness below is often 

 one-third of an inch. The absence of wrinkles from the back sur- 

 face, except perhaps faint traces within a fourth of an inch of the 

 margin, and the structure of the surface under the microscope, dis- 

 tinguish the species from the following ; and both of these characters, 

 with the mode of growth, separate it from the preceding. The polyps 

 of the specimen examined never fully expanded. 



7. GEJIMIPORA BRASSICA. (Dana.) 



G. explanata, frondibus basi cucullate convolutis, tenuibus, maximis. 

 Corallum extus omnino rugatum ; intus caliculis spar sis, conico-cylin- 

 dricis, cellis paulo profundis, apertura %'" latis. 



Explanate ; fronds cucullately infolded with one another at base, 

 thin, very- large. Corallum with the exterior every where wrinkled; 

 within, calicles rather remotely scattered, conico-cylindrical, cells 

 shallow, \ a line broad at the aperture. 



Plate 29, fig. 1, corallum; \b, transverse section of calicle, seen 

 from above, enlarged ; 1 c, calicle enlarged. 



Feejee Islands. Exp. Exp. 



This species forms large clumps, consisting of leaves, rolled around 

 one another, sometimes two and a half feet or more high, and two feet 

 in breadth. The folia are nearly straight vertically, and very thin, 

 scarcely exceeding an eighth of an inch in any part. The under 

 surface is wrinkled for six inches or more from the margin, in which 

 it differs strikingly from the two preceding species. The granules of 



104 



