232 TWEXTY-THIRD REPORT OX THE StATE CaBINET. 



jecting more than an eiglitli of an inch above the intervening- spaces ; 

 central depression very irregular, varying from one-tenth to thirty-five 

 hundredths of an inch in diameter, and sometimes more than an eiglith 

 of an inch in depth : entire cell from one-fourtli to three-fourths of an 

 inch in width, partially limited by a wall formed by the coalescing of. 

 the costse from the adjoining cells. Rays numbering from twenty- 

 eight to thirty-two, about half of which extend to the small horizontal 

 piate in the center, while the remainder terminate just within the 

 inner wall. Eays and costse, continuous, passing down the outside of 

 the cell-walls and over the intercellular spaces. Intercostal and inter- 

 septal spaces divided by numerous thin, transverse partitions. 



This species is mentioned by Mr. C. A. "White {Joe. cit.) under tlie 

 name Smithia Woodmani, but the exsert form of the cells, and their 

 limitation by an outer wall, are features which do not exist in Smithia, 

 but pertain to the genus Pachtphylmtm. 



Formation and locality. Very common in the marly beds at Eock- 

 ford and Hackberrv, Iowa. 



Paciiyphylltim solitaeium n. sj?. 



Plate 9, figs. 6, 7. 



Coral growing in solitary cup-shaped cells, from one-half to three- 

 fourths of an incli in diameter, sometimes one inch and a half in height, 

 slightly curved, externally irregular, and showing evidences of attach- 

 ment at the lower extremity. Calyx as deep as wide, outer wall thin ; 

 rays numerous, moderately strong, from sixty to more than seventy in 

 number, alternating in size within the cup. Costte distinct and con- 

 tinuous with the rays over the edge of the cup and for some distance 

 below the margin ; lower down, often interrupted or covered by an 

 imperfect epithecal crust (which is often broken and sometimes almost 

 entirely absent), showing traces of numerous transverse partitions. 



This is the only solitary species of the genus so tar as known, but it 

 agrees perfectly with the generic character otherwise, and M-ith the 

 structure of the compound species, so that this deviation does not seem 

 to warrant its separation. 



Formation and locality. In the marly beds at Rockford, Iowa. 



Genus — CAMPOPHYLLUM Ed. & Haime. 



Campophyllum nanum n. sp. 



Coral small, elongate-turbinate, irregularly distorted in gi'owth, and, 

 in older specimens, frequently contracted at the upper part. Calyx 

 deep, broad at base, with nearly vertical sides ; rays well developed, 

 about sixty in nmnber, alternating in size, and strongly denticulate on 



