264 ZOOPHYTES. 



indentation of the lamellae. The lamellae are thin and crowded (about 

 twenty-one" to half an inch), rounded above, and project a little above 

 the septum. The septa when worn bare of the lamellae are truncate, 

 with an irregular line of small cellules along the centre of the top. 

 The bottom of the fossa? is convolute-porous. 



Lapis corattinus globosus, &c., Seba, Thes. Meandrina cerebriformis, Lamk., ii. 386, 



iii. fig. 6, tab. 112, a figure of a fresh No. 2. 



specimen, badly represented : figure 5 , Deslongchamps, Encyc., 508. 



may be this species, or perhaps the valida; , Blainville, Man. 357. 



figure 1 is probably the following. M. Platygyra cerebriformis, Ehrenb. Gen. 



Mad. labyrinthifarmis, Esper, Pflanz. i. 74, Ixii. sp. 3. 



tab. 3; this figure is referred by Lamarck Figure 8, plate 96, Voyage de 1'Uranie, by 



to his labyrinthica ; yet it has the sul- Quoy and Gaymard, would hardly be re- 



cate ridges and other characters of the cognised as a representation of a Mean- 



cerebriformis. drina. The M. cerebriformis, in the 



, Linn. ed. xii. 1274. Voyage de 1'Astrolabe, pi. 18, figs. 2, 3, 



is our M. tennis. 



13. MEANDRINA TRUNCATA. (Dana.} 



M. hemispherica ; discis linearibus, longis et twtuosis; gyris 4-5'" latis. 

 Corallum subcellulosum, robustum ; septis apice truncatis et large J" 

 crassis, solidis ; fossis paulo latioribus, fundo lineatis. 



Hemispherical ; linear disks long and tortuous ; gyri 4 to 5 lines broad. 

 Corallum subcellular, firm ; septa at apex truncate and full J of an 

 inch thick, solid; fossae a little broader, narrow-linear at bottom. 



Plate 14, fig. 3, section of cells and ridges of worn specimen, natural 

 size ; 3 a, worn surface. 



This description is taken from a worn hemispherical specimen, a 

 foot in diameter, in the Boston Museum. The septa are bare at 

 top and flat, and the cells deep triangular, with a very narrow 

 linear bottom. It resembles much a worn specimen of the M. cere- 

 briformis, but the septa have not a series of fine cellules along the 

 centre, and they consequently wear flat instead of becoming a little 

 depressed at middle. 



Lapis corallinus globosus, undulatus, pli- glabris, Seba, Thes. iii. tab. 112, fig. 1 ; 

 cis crassis inter se convolutis, supernl from a worn specimen. 



