190 ZOOPHYTES. 



Plate 9, fig. 1 , part of a corallum, natural size. 



East Indies. Exp. Exp. 



This beautiful species is remarkable for the size and depth of its 

 calicles, their never coalescing by their sides, and the neat regularity 

 of the denticulate lamellae. The lamellae project about one-eighth of 

 an inch above the septum, which is very thin ; about three-fourths of 

 an inch down in the cell, they abruptly enlarge, narrowing the cell, 

 and then extend half an inch below this width with an entire margin. 

 One specimen in the Expedition collections measures four inches in 

 height and six in breadth. One meandering trench with its windings, 

 is six inches long, and contains ten polyp mouths. It is probable 

 that it grows in hemispherical forms. 



Amarantum saxeum, Rumphius, Amb. vi. 244, tab. 87, fig. 1 ; probably a reduced 

 figure of the above species. 



This species appears to have been confounded with thefissa and areolata. 



The Turbinolia Geaffrmji of Audouin (Savigny, fig. 1, pi. 4, Desc. de 1'Egypte), is 

 near this species, but has the exterior striate for half an inch only. Ehrenberg's Mani- 

 cina Hemprichii, is referred by him to Savigny's figure; yet "lamellis validissime spi- 

 nosis," appears to be a distinctive character, as the lamellae are denticulate in the figure 

 by Savigny. Ehrenberg's description is as follows: " 5-pollices lata, 3" alta, breviter 

 turbinata, margine sinuoso, leviter revoluto, sinubus maximis, nee margine coalitis, 

 lamellis validissime spinosis" (Gen. Ixiii. sp. 1). A Mussa, allied to the multUobata ? 



NOTE. Var. stricta. In the collections at Peale's Museum, Philadelphia, there is a 

 specimen resembling the amarantum, but smaller. The following are its distinguishing 

 characters (plate 9, figures 2 a, 2 b). Fossa one-sixth to one-eighth of an inch broad, and 

 dilating near the margin to three-fourths of an inch ; about three-fourths of an inch deep, 

 and abruptly narrowed one-third to one half an inch from the top ; ridges about one- 

 eighth of an inch thick. The specimen is two inches high and three broad, and may 

 have come from the West Indies. 



2. MANICINA. FISSA. (Ehrenberg.} 



M. stipitata, conveza, sapius aggregata ; discis sinuosis. Corallum mar- 

 gine tenue, lobatum, et late plicatum; collibus fere J" latis, subtrun- 

 catis et sukatis,septis laze cellulosis, fa" crassis ; fossis profundissimis 

 (scepe 1"), irregularibus, ad marginem dilatatis ; lamellis laxis, 

 foliaceis. 



Stipitate, convex, mostly aggregate in structure ; disks sinuous. Co- 



