194 ZOOPHYTES. 



Turbinato-globose ; gyri about f of an inch broad. Corallum, sparingly 

 dilated at base ; ridges nearly perpendicular, and mostly entire ; 

 lamellae subtruncate at apex, lateral surfaces arenose ; fossae 4 to 5 

 lines deep, 2 to 4 lines broad. 



West Indies. Ehrenberg. 



This species is near the areolata, but has the ridges entire or nearly 

 so, and not over two lines wide ; the septa are about a line in width, 

 and the texture is quite open cellular. The lamellae are a little dilated 

 at base. 



Manicina prcerupta, Ehrenberg, op. cit. Fucus marinus, &c., Seba, No. 7, tab. Ill ; 

 Gen. Ixiii. sp. 9. agrees with a specimen before the author. 



APPENDIX. Manicina dilatata. Ellis's figure 4, tab. 47, differs 

 decidedly from the areolata in its more varying fossae, dilating some- 

 times to an inch, and nearly half an inch deep. The species is here 

 merely indicated, as only worn specimens have been seen by the- 

 author. 



Esper's Madrepora natans (Pflanz. i. tab. 23) appears to be near 

 the Manicina hispida. It is hemispherical in shape, and has high 

 nearly perpendicular ridges, rounded and sulcate above, with the 

 trenches irregular and averaging of an inch wide. It is represented 

 by Esper as light enough to float. He mentions a specimen a foot in 

 diameter. 



The Manicina interrupta of Ehrenberg, from the Red Sea, appears 

 to belong to another genus. The description is as follows : " Lati- 

 tudine disci quadripollicari, duplo latior quam alta, turbinata, turnida, 

 collibus latis, sulco tenui medio lamellas latas, integras, granulatas 

 truncatasque dividente, collium pariete angusto, membranaceo, recto, 

 cristis 4'" distantibus." (Op. cit. G. Ixiii. sp. 2.) In its broad entire 

 lamellae it seems to approach the Euphylliae. 



GENUS V. TRIDACOPHYLLIA. BLAINVILLE. 



Astrceidce aggregates ; animalibus amplioribus, lateribus late explanatis et 

 assurgentibus ; tentaculis minutis. Coralla substipitata, septis tennis- 



