352 
PALAEONTOLOGY OF NEW YORK. 
LING VLIBNL-Continued. 
Lingulella, Salter, 1866. Barkoisella, tiall, 1892. 
Lingulepis, Hall, 1863. Tomasina, Hall, 1892. 
Family TRIMERELLIDLE, Davidson and King. 
Lakhmina, CElilert, 1887. 
Davidsonella, Waagen, 1885. 
Lingulops, Hall, 1871. 
Lingulasma, Ulricli, 1889. 
Dinobolus, Hall, 1871. 
Conradia, Hall, 1862. 
Obolellina, Billings, 1871. 
Monomerella, Billings, 1871. 
Trimerella, Billings, 1862. 
Rhinobolus, Hall, 1874. 
Order Diacaulia, or Discinacea, Waagen. 
Family RISCINIRyE, Gray. 
Discinolepis, Waagen, 1885. 
Paterula, Barrande, 1879. 
ScHizoBOLUS, Ulrich, 1886. 
Trematis, Sharpe, 1847. 
ScHizocRANiA, Hall and Whitfield, 
CEhlertella, Hall, 1892. 
Lingulodiscina, Whitfield, 1890. 
Orbiculoidea, d’Orbigny, 1847 
Schizotreta, Kutorga, 1848. 
Lindstrcemella, Hall, 1892. 
75. Roemerella, Hall, 1892. 
Family EIPHONOTRETIDJE, Kctorga. 
Acrothele, Linnarsson, 1876. 
Linnarssonia, Walcott, 1885. 
Discmopsis, Matthew, 1892. 
Acrotreta, Kutorga, 1848. 
CoNOTRETA, Walcott, 1889. 
Mesotreta, Kutorga, 1848. 
ScHIZ AMBON, Walcott, 1884. 
Siphonotreta, de Verneuil, 1845. 
Orbicella, d’Orbigny, 1849. 
Keyserlingia, Pander, 1861. 
Helmersenia, Pander, 1861. 
Order Gastropegmata, or Craniacea, Waagen. 
Family CRANIIDJE, King. 
Crania, Retzius, 1781. 
Numulus, Stohoeus, 1732. 
Ostracifes, Beuth, 1776. 
Criopus, Yo\i, 1791. 
Criopoderma, Poll, 1791. 
Orhicula, Cuvier, 1798. 
