CONTENTS. 



CHAPTER IV. 



Relations of MonticuHpora to allied types — The general structure of Chse- 

 tetes, Fischer, as compared with that of MonticuHpora — The general 

 structure of Stenopora, Lonsd., and the points in which this genus 

 differs from and agrees with Monticulipora — Stenopora Howsii, Nich, 

 — Relations of Tetradium, Safford, to Monticulipora — Affinities of 

 Monticuliporoids and the Helioporidre — Ceramopora, Hall, and its 

 relations to Monticulipora — Heterodictya, Nich., and its relations 

 to Monticulipora, . . . . . . -79 



CHAPTER V. 



The subdivisions of Monticulipora — The theoretical compactness and 

 unity of the genus — The practical convenience of separating Fistuli- 

 pora, M'Coy, Constellaria, Dana, and Dekayia, E. and H., as distinct 

 genera — The general characters of Fistulipora, M'Coy — The structure 

 of the so-called Fistulipora Canadensis, Billings — The general char- 

 acters of Constellaria, Dana — The general characters of Dekayia, E. 

 and H. — The general characters of Monticulipora, D'Orb., in a re- 

 stricted sense — Subdivision of the genus into the sub-generic groups 

 Heterotrypa, Nich., Diplotrypa, Nich., Monotrypa, Nich., Prasopora, 

 Nich. and Eth. jun., and Peronopora, Nich. — Summary of the char- 

 acters of these subdivisions, . . . . . .90 



CHAPTER VI. 



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

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

 — M. ramosa, D'Orb. — M. rugosa, E. and H. — M. Dalii, E. and H. 

 — M. nodulosa, Nich. — M. O'NeaUi, James — M. tumida, Phill.— M. 

 tumida, Phill., var. miliaria, Nich. — M. gracilis, James — M. Andrewsii, 

 Nich. — M. Ulrichii, Nich. — M. subpulchella,^ Nich. — M. monilifor- 

 mis, Nich. — M. Barrandi, Nich. — M. Dawsoni, Nich. — M. Jamesi, 

 Nich.— M. implicata, Ulrich — M. Trentonensis, Nich. — M. Girvan- 

 ensis, Nich., . . . . . . . -103 



CHAPTER VII. 



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

 tailed descriptions of illustrative species — Inadmissibility of Dianul- 

 ites, Dybowski — M. petropolitana, Pand.^M. Whiteavesii, Nich. — 

 M. calycula, James, . . . . . . . 155 



