TRIBE I. ASTR^EACEA. 191 



rallum having the margin thin, lobate, broadly plicate; ridges nearly 

 % an inch broad, subtruncate and sulcate ; septa openly cellular, 

 of an inch thick, trenches very deep (often 1 inch), irregular, dilate 

 ing at the margin ; lamellae lax, foliaceous. 



West Indies ( ? ). 



The deep, irregular trenches, large duplicate ridges, and lax folia- 

 ceous lamellae, make the species easily recognisable. Along the sum- 

 mit edge of the septum, run longitudinally two calcareous lines (edges 

 of plates) about of an inch apart with an open cellular space between. 

 The species has the lax habit of a Ctenophyllia, and the lamella ap- 

 pear also from Ellis's figure to be entire. It may be found necessary 

 on farther examination of specimens to transfer it to another genus. 



Ellis and Solander, tab. 51, fig. 1.; but Manicina fissa, Ehrenberg, op. cit., G. 



without name or description. Lamarck Ixiii. sp. 6. 



refers Ellis's figure to the Meandrina Folia tenuissima fragilia, non dentata, 



pectinata our Ctenophyllia pectinatu. Seba, iii. tab. 108, figs. 3 and 5. 



3. MANICINA AREOLATA. (Ellis.) Ehrenberg. 



M. breviter turUnata, margine sinuoso-plicata, gyris -" latis, parct 

 sinuosis, plids pkrumque coalitis. Corallum collibus saepius duplicatis, 

 latis, et valde concavis ; fossis $" profundis, lamellis basi paulum dila- 

 talis. 



Short turbinate, sinuoso-plicate at margin, gyri to of an inch broad, 

 sparingly sinuous, folds for the most part coalescing. Corallum 

 with the ridges generally duplicate, broad, and strongly concave; 

 fossce $ of an inch deep, lamellae a little dilated at base. 



Plate 9, fig. 3, profile vertical section, natural size. 



^ 



West Indies. 



This species has not the entire or subentire ridges of the prcerupta 

 nor the deep fossae of the hispida. The form and general character 

 are well represented in Ellis's figure 5, plate 47. The fossae are about 

 two lines wide, except where dilated at the margin. The species un- 

 dergoes a change of form as it enlarges by growth, and more study of 

 it at the localities is necessary before its variations and all its distinc- 



