390 Forty-second Report on the State Mvseum. 



TRIMERELLIDiE. 



47. Trimerella, Billings, 1862. 



48. Monomerella, Billings, 1871. 



49. Rhinobolus, Hall, 1871. 



50. Dinobolus, Hall, 1871. 



65. Crania, Retzius, 1781. 



56. Orbicula, Guvier, 1798. 



57. Criopus, Gray, 1821. 



58. Craniella, (Ehlert, 1888. 



59. Cardinocrania, Waagen, 1885 



60. Pseudocrania, McCoy, 1851. 



51. Conradia, Hall (My.), 1871. 



52. Gotlandia, Dall, 1870. 



53. Obolellina, Billings, 1871. 



54. Davidsonella, Waagen, 1885. 



CRANIAD2E. 



61. Paleeocrania (Eichwald), Quen. 

 stedt, 1871. 



62. Choniopora, Schauroth, 1854. 



63. Craniops, Hall, 1859. 



64. Pholidops, Hall, 1860. 



Order Articulata. 



Family Orthid^s. 



65. Orthis, Dalman, 1828. 



66. Bilobites, Linnseus, 1775. 



67. Diccelosia, King, 1850. 



68. Platystrophia, King, 1850. 



69. Schizophoria, King, 1850. 



70. Orthambonites, Pander, 1830. 



71. Orthostrophia, Hall, 1882. 



72. Scenidiurn, Hall, 1860. 



73. Mystrophora, Kayser, 1871. 



74. Enteletes, Fischer, 1837. 



75. Syntrielasma, Meek, 1865. 



76. Orthonomaea, Hall, 1858. 



Strophomenid^. 



77. 



78. 

 79. 

 80. 

 81. 

 82. 

 83. 

 84. 

 85. 

 86. 

 87. 



Strophomena, Rafinesque, 1820. 

 Strophodonta, Hall, 1852. 

 Leptagonia, McCoy, 1844. 

 Plectambonites, Pander, 1830. 

 Strophonella, Hall, 1879. 

 Leptsena, Dalman, 1828. 

 Davidsonia, Bouchard, 1849. 

 Orthisina, D'Orbigny, 1847. 

 Streptorhynchus, King, 1850. 

 Orthothetes, Fischer, 1829. 

 Gonambonites, Pander, 1830. 

 Hemipronites, Pander, 1830. 



89. Klitambonites, Pander, 1830. 



90. Pronites, Pander, 1830. 



91. Hipparionyx, Vanuxem, 1842. 



92. Meekella, White and St. John, 



1868. 



93. Triplesia, Hall, 1859. 



94. Dicraniscus, Meek, 1872. 



95. Streptis, Davidson, 1881. 



96. Derbyia, Waagen, 1884. 



97. Waagenia, gen. nov. 



98. [?] Tropidoleptus, Hall, 1857. 



99. [?] Vitulina, Hall, 1857. 



PRODUOTID.E. 



100. Chonetes, Fischer, 1837. 



101. Aulacorhynchus, Dittmar, 1872. 



102. Isogramma, Meek and Wor- 



then, 1873. 



103. Strophalosia, King, 1844. 



104. Lepteenalosia, King, 1845. 



105. Orthothrix, Geinitz, 1847. 



106. Chonetella, Waagen, 1884. 



107. Daviesiella, Waagen, 1884. 



108. Aulosteges, Helmersen, 1847. 



109. Productus, Sowerby, 1812. 



110. Productella, Hall, 1867. 



111. Marginifera, Waagen, 1884. 



PoRAMBONITIDJE. 



112. Porambonites, Pander, 1830. | 113. Isorhynchus, King, 1860. 



RlCHTHOFENEDiE. 



114. Richthofenla, Kayser, 1883. 



