48 VERRILL, SYNOPSIS OF 



papillose ; the pali less prominent ; the cup deeper, etc- 

 A specimen preserved in alcohol shows a distinct, transpa- 

 rent membrane over the whole wall, and covering with a 

 somewhat inflated fold each of the costas which are visible 

 through it. At the edge of the cup the wall membrane 

 presents a distinct angle, where it joins the disk. The 

 mouth is a large oval opening, with an apparently simple 

 margin. The tentacles are not apparent. 



All the specimens that I have seen of the three species 

 here described are on small univalve shells, which are occu- 

 pied by Sipunculus or some similar worm, which maintains 

 only a small round hole at the mouth of the shell ; all other 

 parts, except occasionally the tip of -the spire, being covered 

 by the coral. But young specimens do not spread on the 

 shell beyond the basal attachment, and the shell is inhabited 

 by the same worm, with a similar hole ; the remaining por- 

 tion of the mouth of the shell being closed by particles of 

 agglutinated sand, &c., thus proving that the corals grow 

 gradually over this portion, like the surface of the shell it- 

 self. 



STEPHANOSERIS SULCATA Verrill, nov. 



This species differs from the others in having thin and 

 very prominent costa3 ; which are dentate along the edges 

 and scarcely granulated ; those corresponding to the last 

 cycle being represented only by rows of sharp teeth. The 

 principal costa3 are separated by rather broad, concave sul- 

 cations. The wall is well developed, thin and compact. 

 The septa are less crowded than in the other species, and 

 have their sides not so strongly granulated. Their summits 

 are too much broken in the single specimen observed for accu- 

 rate description. 



Height .2 of an inch; diameter .25. 



Ceylon. Yale College Museum. 



DIASERIS PULCHELLA Verrill, nov. 

 Plate 1, figure 3. 



Corallum subcircular, showing usually from two to five 

 lobes, but sometimes nearly entire. The lobes are more or 



