TABLE OF CONTENTS. xin 



CHAPTER VIII. — Descriptions or the Species (continued). 



Pent ran ilea elongatus, Shumaid Kil 



conoideus, 1 1. all 162 



sulcatus, Rocmcr 165 



obesus, Lyon Ki7 



pyriformis, Say 167 



Definition of genus Pentremitidea 169 



General characters . 170 



Pentremitidea Paillettei, de Verncuil, sp 172 



Lusitanica, E. & C 173 



Eifelensis, Roemer, sp 171 



Malladai, E. & C | 75 



elavata, Schultze, sp 17(j 



var. Schultzei, E. & C, var. . . . 177 



Wachsmuthi, sp. nov 17S 



Gilbertsoni, sp. nov 17'.) 



angulata, E. & C 180 



si mi lis, E. & C 180 



Definition of genus Mesoblastus 181 



General characters 182 



Mesoblastus crenulatus, Roemer, sp 183 



angulatus, G. B. Sowerby, sp 185 



elongatus, Cumberland, sp 186 



Sowerbii, sp. nov 187 



Rofei, sp. nov 188 



Family Troostoblastidae 190 



Definition of genus Troostocrin.ua 11)1 



General characters 192 



Troostocrinus Rdnwurdti, Troost, sp 194 



Definition of genus Metablastus 19(5 



General characters 197 



Metablastus lineatus, B. F. Shumard, sp 199 



Hisjjanicus,~E. &C 200 



Cottaldi, Mun.-ChalmaSj sp 201 



Definition of genus Triccelocrinus 20o 



General characters 20 1 



Tricalocriiius obliqunlus, Roemer, sp 206 



Meekianus, sp. nov 208 



Family Nucleoblastidae 209 



Subfamily Elseacrinidse 210 



Definition of genus Elaacrinus 210 



General characters 212 



