CONTENTS. 



CHAPTER VIII. 



The general characters of the sub-genus Monotrypa, Nich., and de- 

 tailed descriptions of illustrative species — M. undulata, Nich. — M. 

 Winteri, Nich. — M. irregularis, Ulrich — M. quadrata, Rom. — M. 

 clavacoidea, James — M. calceola, Miller and Dyer — M. pulchella, 

 E. and H. — ^^M. petasiformis, Nich. — M. discoidea, James — M. 

 pavonia, D'Orb. — M. briarea, Nich. — M. tuberculata, E. and H., . i68 



CHAPTER IX. 



The general characters of the sub-genus Prasopora, Nich. and Eth. jun., 

 and detailed descriptions of illustrative species — M. (Prasopora) 

 Grayae, Nich. and Eth. jun. — M. Selwynii, Nich. — M. Selwynii, var. 

 hospitalis, Nich. — M. Newberryi, Nich., .... 



CHAPTER X. 



The general characters of the sub-genus Peronopora, Nich., and de- 

 tailed descriptions of illustrative species — M. frondosa, D'Orb. — 

 Difficulties in the way of identifying this species — M. decipiens, 

 Rom., identical with the form believed to be M. frondosa, D'Orb. 

 — M. molesta, Nich. — M. Cincinnatiensis, James — M. ? Ortoni, 

 Nich., and its relations to the genus Atactopora, Ulrich, . -215 



APPENDIX. 



The characters of the genus Trematopora, Hall (Dybowski) — the char- 

 acters of the genus DittoJ>ora, Dybowski, . . . .232 



Index, ......... 237 



