450 explanation op plates. 



Plate 136. 



FIGURE. PAGE. 



5*7-59. Thecidia papillata, Schloth. Chalk; Europe, . 314 



60-63. Ai'giope decollata, Chemn, Mediterranean Sea, . 313 

 64, 65. Argiope (Cistella) Davidsoni, Moore. *Lias; En- 

 gland, .......... 313 



66, 61. Stringocephalus Bartini, Defrance. ^. Devonian; 



Europe, 313 



68. Rhynehonella vespertilio. Orb. Cret. ; Touraine, . 315 



69-11. Rhynehonella psittacea, Chemn. Recent; Arctic 



Seas, -. . . 315 



72. Rhynehonella nigricans, Sowb. Recent ; N. Zealand. 

 Dorsal valve with the animal, a, adductor muscles; 

 t^ intestine, . . . . . . . . .315 



■73, 74. Rhynehonella acuminata, internal casts. 7o, umbo- 

 nal aspect ; 7^, ventral aspect ; yi, adductor; i?, car- 

 dinal; P, pedicle; F, vascular; 0, ovarian impressions, 315 

 75., Rhynehonella (Acanthothyris) spinosa, Schl. |. Inf. 



Oolite; Europe, ........ 315 



76-79. E.itonia medialis, Hall. L. Helderberg, N. Y., . 315 

 80,81. Stricklandia lens, Billings. Silur. ; Canada, . . 316 



82. Camerophoria Schlotheimi, Buch. Zechstein, Gera, . 317 



83, 84. Camerophoria crumena, Martin. Ventral valve: 



d, converging dental plates, supported on a low septal 

 ridge, s ; dorsal valve ; s, septum, supporting a spoon- 

 shaped central process, F; 0, long, slender oval lam- 

 elite ; j, cardinal process, ...... 317 



85-87. Pentamerus Knightii, Sby. U. Silurian ; Europe. 

 86^ longitudinal section ; 87^ transverse section ; d, 

 dental plates ; s, septum ; dorsal valve with two con- 

 tiguous loiigitudinal septa [s, .s], opposed to the 

 plates of the other valve, ...... 317 



88-91. Atrypa reticularis, Linn. Palaeozoic; N. Am., Eur., 318 



Plate 137. 



92. Atrypa (Coelospira) Camilla, Hall. U.Silurian; Cale- 



donia, N. Y., 319 



93. Glassia Whidbornei, Davidson. Palaeozoic; Europe, . 319 



94. Anazygarecurvirostra, Hall. Trenton Limest.; Canada, 319 



95. 96. Spirifer striatus. Mart. Cai-b. Limestone; Ireland, 320 

 97. Spirifer Wolcotti, Sowb. ^ Lias; Bath, England, .320 

 98-100. Spirifer (Spiriferina) rostrata, Schloth. Lias; 



Ilminster, Eng., 320 



1, 2. Spirifer (Suessia I imbricata,Desl. Lias ; Normand}^, 321 



3. Spirifer (Cyrtia I trapezoidalis, Dalman. Palaeozoic, . 321 



4, 5. Spirifer (C^^rtina) heteroclita, Defrance Devon.; 



Eifel 322 



