352 PALEONTOLOGY OF NEW YORK. 



LING ULID^^;— Continued. 



LiNGULELLA, Salter, 1866. Barroisella, Hall, 1892. 



LiNGULEPis, Hall, 1863. Tomasina, Hall, 1892. 



Family TRIMERELLIDJE, DAvrnsoN and King. 



Lakhmina, CEhlert, 1887. Conradia, Hall, 1862. 



Davidsonella, Waagen, 1885. Obolellina, Billings, 1871. 



LiNGULOPS, Hall, 1871. Monomerella, Billings, 1871. 



LiNGULASMA, Ulricli, 1889. Trimerella, Billings, 1862. 



DiNOBOLus, Hall, 1871. RhiNobolus, Hall, 1874. 



Order Diacaulta, or Discinacea, Waagen. 



Family DISCINIDJE, Ghay. 



DisciNOLEPis, Waagen, 1885. Lingulodiscina, Wliitfield, 1890. 



Paterula, Barrande, 1879. Orbiculoidea, d'Orbigny, 1847 



ScHizoBOLUs, Ulrich, 1886. Schizotreta, Kutorga, 1848. 



Trematis, Sharpe, 1847. Lindstrcemella, Hall, 1892. 



ScHizocRANiA, Hall and Whitfield, 1875. Roemerella, Hall, 1892. 

 CEhlertella, Hall, 1892. 



Family SIPHONOTRETIDM Kutorga. 



Acrothele, Linnarsson, 1876. Schizambon, Walcott, 1884. 



Linnarssonia, Walcott, 1885. Siphonotreta, de Verneuil, 1845. 



DisciNOPSis, Matthew, 1892. Orbicella, d'Orbigny, 1849. 

 Acrotreta, Kutorga, 1848. Kei/serlingia, Pander, 1861. 



Conotreta, Walcott, 1889. Helmersenia, Pander, 1861. 

 Mesotreta, Kutorga, 1848. 



Order Gastropegmata, or Craniacea, Waagen. 



Family CRANIIDM, King. 



Crania, Retzius, 1781. Cnqpas, Poli, 1791. 



Numulus, Stoboeus, 1732. Criopoderma, Poll, 1791. 



Ostracites, Beuth, 1776. Orbicula, Cuvier, 1798. 



