450 EXPLANATION OF PLATES. 
PLATE 136. 
FIGURE. ; 
57-59. Thecidia papillata, Schloth. Chalk; Europe, 
60-63. Argiope decollata, Chemn. Mediterranean Sea, 
64, 65. Argiope (Cistella) Davidsoni, Moore. Lias; En- 
PAGE, 
. 314 
. 313 
gland, . : . 313 
66, 67. Stringocephalus Burtini, Defrance. x Devonian; 
Europe, ; ; . 313 
8. Rhynchonella vespertilio, Orb. Cret.; Touraine, . 815 
ae Tl. Rhynchonella Lae een Chemn. Recent; Arctic 
Seas, . : 5 : : ; . 815 
72. Rhynchonella nigricans, “Sowb. Recent; N. Zealand. 
Dorsal valve with the "animal. a, adductor muscles ; 
ft, intestine, , : ; . 815 
13, 74. Rhynchonella acuminata, internal casts. 73, umbo- 
nal aspect; 74, ventral aspect; A, adductor; &, car- 
dinal; P, pedicle; V, vascular; O,ovarianimpressions, 315 
75. Rhynchonella (Acanthothyris) spinosa, Schl. 3. Inf. 
Oolite; Europe, . : : ‘ ; , . old 
76-19. Estonia medialis, Hall: , Helderberg, N.. Yisu9 . 315 
80, 81. Stricklandia lens, Billings. Silur.; Canada, LG 
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 ceutral process, V; O, long, slender oval lam- 
elle; 7, cardinal process, . ; , : : ‘alt 
85-87. Pentamerus Knightii, Sby. U. Silurian; Europe. 
8&6, longitudinal section; 8&7, transverse section; d, 
dental plates; s, septum; dorsal valve with two con- 
tiguous lougitudinal septa [s,s], opposed to the 
plates of the other valve, . sae 
88-91. Atrypa reticularis, Linn. Paleozoic; N. ‘Am., Eur., 318 
PLATE 137. 
92. Atrypa (Ceelospira) camilla, Hall. U.Silurian; Cale- 
donia, N. Y. : : ‘ ‘ : wag 
93. Glassia Whidbornei, Davidson. Palzozoic; Hurope, . 319 
94. Anazyga recurvirostra, Hall. Trenton Limest.; ; Canada, 319 
95, 96. Spirifer striatus, Mart. Carb. Limestone; Ireland, 320 
97. Spirifer Wolcotti, Sowb. +. Lias; Bath, England, 320 
98-100. Spirifer (Spiriferina) rostrata, Schloth.  Lias; 
Ilminster, Eng., . p : : . 320 
1, 2. Spirifer (Suessia: imbricata, Desl. Lias; Normandy, 321 
3. Spirifer (Cyrtia) trapezoidalis, Dalman. Paleozoic, . 321 
4, 5. Spirifer (Cyrtina) heteroclita, Defrance Devon.; 
Hifel, . : : ; 322 
