46 VERRILL, SYNOPSIS OF 



Pejee Islands. Prof. J. D. Dana, U. S. Expl. Exp. 

 Coll. Smithsonian Institution. 



STEPHANOSERIS LAMELLOSA Verrill, nov. 

 Plate 2, figures 4 and 4a. 



Corallum low, subcylindrical, with a very broad incrust- 

 ing base, which is attached to, and entirely surrounds small 

 univalve shells, with the exception of the opening. The in- 

 crusting matter on remote parts of the shell often consists 

 of small conical granulations much crowded and arranged 

 in rows, near the walls these pass into costae, which are very 

 thick, prominent and granulated at the base, thinner above, 

 those of three first cycles much the strongest and thickest, 

 subequal ; those of the fourth, which alternate with them, 

 distinct and prominent, but thin, spongy and lacerately 

 toothed, disappearing much sooner towards the base than 

 the others. Wall rudimentary, represented near the mar- 

 gin only by trabicular processes. 



Septa in four cycles, thin, strongly granulated, the prima- 

 ries much the broadest, and most exsert, with subentire, 

 rounded tops, and vertical inner edges ; those of the other 

 cycles, thinner and very narrow, exsert, with the edges lac- 

 erate, those of the fourth cycle broader than those of the 

 third; occasionally in large specimens some rudimentary 

 septa of the fifth cycle appears. Columella well developed, 

 papillose, not distinguishable from the innermost pali, several 

 of which rise as slender, styliform, toothed processes from 

 the base of each septum, those from the primaries the larg- 

 est. 



Height .1 to .2 of an inch ; diameter of cup .2 to .25. 



Loo Choo Islands in 8 fathoms, sand. Dr. Wm. Stimp- 

 son. 



In very young specimens the base spreads but very little 

 on the shell, which is quite naked beyond the termination of 

 the costae. The wall is entirely rudimentary, causing the 

 costae to appear very prominent ; the septa project but little 

 above the columella, and the surface of the coral is nearly 

 flat on account of the absence of a wall to the cup. The 



