526 



Report of the State Geologist. 



I 



Fig. 76. Diplopora hifurcata, natural size. 

 Fig, 77. A frond, x9. 



Cbisinella, Hal]. 

 (Rep. of N. Y. State Geologist for 1883, pi. 26.) 



Type, Crisinella scrobiculata, Hall (sp.). 

 (Plate 9, figs. 1-3.) 



Zoarium ramose, solid; celluliferous on one face; cell apertures 

 disposed in oblique ascending rows from the middle to the margin 

 of the branch ; peristomes prominent. 



Family Arthrostylidae, Ulrich, emend. 

 This family contains at present only the genus Aethrostylus. 



\ 



Fig. 78. Arthrostylus conjunctus. Lateral view of a portion of a segment,>18. 



Fig. 79. Noncellulifercus face.xlS. . 



Fig. 79o. Lateral view of another species. 



