188 ZOOPHYTES. 



the trenches one to one and a half inches wide, lamellae stout, and ap- 

 parently large and small alternate ; ridges very stout (a fourth of an 

 inch thick), nearly solid, with some transverse cellules. In a vertical 

 section, the transverse dissepiments and cellules are very coarse. 

 The name sinuosa, being elsewhere in use, has above been changed. 



Meandrina sinuosa, Quoy and Gaymard, Meandrina sinuosa, Lamarck, 2d ed. ii. 

 Voy. de 1'Ast., iv. 227, pi. 18, figs. 4, 5. 389, No. 10. 



GENCJS IV. MANICINA. EHRENBERG. 



Astrizida out aggregate, aut segregate gemmata, et explanato-glomeratce ; 

 discis raro simplicibus, scepissime seriatim gemmantibus, et elongate 

 sinuosis. Corolla substipitata, convexa ; cellis fossiformibus, mean- 

 drinis ; margine bene rotundato ; lamellis subcequalibus, tenuibus, et 

 argute denticulatis. 



Animals aggregate or segregate, and explanato-glomerate ; disks rarely 

 simple, very commonly seriately budding, and becoming long and 

 sinuous. Coralla substipitate, convex; cells fossiform, meandering, 

 with the margin rounded; lamellae even, thin, neatly and distinctly 

 denticulate. 



The coralla of the Manicinae are distinguished by their thin and 

 very even lamellae, finely denticulate both within the cells and over 

 the exterior of the calicle, where they appear as neat and regular as 

 within : there are ten to twelve lamellae in a quarter of an inch, seven 

 or eight of which are equally prominent, and the others obsolescent. 

 The cells are large. Some species have the calicles separate branches, 

 like the Mussae ; but from these, there is a gradual transition to spe- 

 cies in which the adjacent calicles throughout are united by their 

 lateral surfaces, with only a single ridge between the cells. In some 

 of them only the inner parts of a group have the ridges thus dupli- 

 cated, while the outer remain single. The bottom of the trenches are 

 throughout finely porous. 



The species differ from the Meandrinae, in growing from a short pedi- 

 cel or central point of attachment. Moreover they are larger species, 



