TRIBE!. ASTRJEACEA. 181 



ous ; larger lamellae much exsert with 3 to 5 smaller intermediate, 

 subtruncate at apex and 2-3-gash-toothed. 



Plate 7, fig. 3 a, 3 b, 3 c, section of cells showing the outline of the 

 lamellae. 



Tahiti, Society Islands. Exp. Exp. 



The sinuous cells ally this to the preceding species, but they are 

 much narrower, and the intervals between are quite evenly one-fifth 

 of an inch. The species is a peculiarly neat one, very evenly sym- 

 metrical in its hemispherical shape, and with the lamellae very un- 

 equally prominent, the larger with subtruncate summits, standing at 

 nearly equal distances considerably above the others. 



9. MUSSA MULTILOBATA. (Dana.) 



M. castanea, disci's linearibus, sinuosis, multilobatis, late virentibus. 

 CoraUum meandrimtm, caliculis " crassis ; ceUa valde gyrosd, ad 

 fundum 3-4 lamellis; lamellis rotundatis, crasse dentatis, minoribus 

 alternis, dentibus subtriangulatis. 



Animal chestnut-brown ; disks long, sinuous, and multilobate, bright 

 green. Corallum meandrine, calicles of an inch wide, cell very 

 much gyrose, at bottom 3 or 4 longitudinal lamellae ; lamellte with 

 a convex apex coarsely toothed, teeth subtriangular, large and 

 small lamellae alternate. 



Plate 8, fig. 2, the animal not fully expanded; 2 a, 2b, profile of 

 lamellae. 



Feejee Islands. Exp. Exp. 



The specimen is a single turbinate calicle, four inches high ; at 

 base it is but half an inch in diameter, but above it spreads to a 

 breadtli of five inches by three, and contains a very sinuous trench, 

 with several lobes, some two inches long, the whole including about 

 twenty polyp mouths. The intervals between adjacent lobes are 

 about one-eighth of an inch broad. The exterior is nearly smooth, 

 somewhat striate above, with occasionally a few sharp teeth on the 

 striae. Along the bottom of the cell, extend three or four lamellae, 

 connecting the different polyp-centres. 



46 



