56 BULLETIN OF THE 



edge. The upper surface concave, sometimes undulate near the margin ; 

 lower surface strongly striated, the costae close and thickened, somewhat 

 granulated. The transverse ridges of the upper surface are regular and 

 often extend across the whole breadth of the surface, occasionally inter- 

 rupted, mostly undulated or flexuous, about as high as broad. Centres of 

 the polyp cells very minute, but distinct, not radiated ; septo-costal striae 

 close and even; bent in a zigzag manner on the ridges. Breadth of a large 

 specimen, 28 inches; height. 15; average thickness, .25; width of the val- 

 leys, .20 Kingsmills Islands ; A. Garret. 



Merulina ampliata Ehrenberg. 1834. 



Svx. Madrepora ampliata Ellis and Sol. 1786; Agaricia ampliata 

 Lamk. 1801; Merulina speciosa Horn (non Dana) is the mature form 

 with rising branches, Proc. Phil. Acad. Xat. Sci. 18G0, p. 435. — Singa- 

 pore ; Capt. W. II. A. Putnam. 



Merulina regalis Dana. 184G. — Fccjee Islands ; J. D. Dana. 

 Merulina speciosa Dana. 1846. — Feejee Islands ; J. D. Dana. 



Clavarina Verrill. 

 Corallum compact, branching. Cells imperfectly circumscribed, but not 

 confounded in series. Septa and walls thickened, the former lacerate- 

 toothed, with paliform teeth at the bases. Columella rudimentary. 



Clavarina seabricula Veurill. 



Svx. Merulina seabricula Dana, Zoophytes, p. 275, pi. 16, f. 2, 2 a, 2b, 

 18 1G. — Feejee Islands; J. D. Dana. 



Zoanthus SOeiatUS Lamarck. 1801. 



Svx. Actinia sociata Ellis, Phil. Trans. 17G7; Ellis and Sol. 1786; 

 Zoantha social a Lamk. Syst. An. sans Vert. 1801 ; Zoantha Ellisii Lamk. 

 Hist. An. sans Vert. 1816; ZoanOius sociatus Eur. 1834. — Florida; L. 

 Agassiz. 



Cerianthvis americanus Agassiz. MS. 



Body very long, often two feet when expanded, and upwards of an inch 

 in diameter, tapering gradually to the base. Outer tentacles very nu- 

 merous, one hundred and twenty or more, slender, about 1.5 inches loner, 

 very flexible; inner ones close to the mouth, about .75 of an inch long, 

 often twisted together spirally. Color of column dark cinnamon brown. 

 with vlarker lines of the same ; marginal tentacles cinnamon color, lighter 

 at the base; inner ones darker, marked with longitudinal white lines: outer 

 portion of the disk yellow, with dark spots at the base of the tentacles. — 

 Charleston, South Carolina, buried in mud; L. Agassiz. 



The descriptions of the colors of this and other species of Actinidce have- 



