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232 INDEX TO THE GENERA. 
Trigonotreta, 22, 54, 62 — 
Triloculina, 132 
Trilophodon, 198 
Trimerus, 16 
Trinucleum, 18 
Trinucleus, 18 
Triton, 168 
Tritonium, 168 
Trivia, 168 
Trochita, 164, 169 
Trochocyathus, 137 r 
Trochonema, 25 
Trochus, 87, 169 
Tropidolepisma, 178 
Truncatella, 178 
Tubiporites, 11 
Tubulipora, 151 
Turbo, 114, 169 
Turbonilla, 169 
Turritella, 88, 169 
Typhis, 170 
Ulidium, 148 
Ulodendron, 32 
Unio, 113, 158 
Urasterella, 15 
Uresthenes, 118 
Vaginulina, 104 
Ventriculites, 105 
Venus, 79, 158, 177 
Vermetus, 170 © . 
Vertebraria, 101, 200 
Verticillopora, 39 ' 
Vola, 159 
Volsella, 71 
Voluta, 170 
Vombatus, 188 
Waldheimia, 152. 
Wilkinsonia, 125 - 
Xylocaryon, 125 
Zamites, 102 
Zaphrentis, 39 
Zeugophyllites, 101, 200 
Zizyphinus, 171, 195 
Zygomaturus, 195 
CAMBRIDGE; PRINTED BY ©, J, CLAY, M.A. AT THE UNIVERSITY Pt 
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