352 



PALAEONTOLOGY OF NEW YORK. 



LiNQDLKLLA, Salter, 1866. 

 LiNOULEPis, Hall, 1863. 



LINO ULIDJR-Cmitiwied. 



Bakroisella, Hall, 1892. 

 ToMASiNA, Hall, 1892. 



Family TRIMERBLLIDJB, DAViDSoif and Kwo. 



Lakhmina, (Ehlert, 1887. 



Davidsonella, Waagen, 1885. 

 LiNGULOPS, Hall, 1871. 

 LiNODLASMA, Ulrich, 1889. 

 DiNOBOLUs, Hall, 1871. 



Conradia, Hall, 1862. 

 Obolellina, Billings, 1871. 



MONOMERELLA, BilUllgS, 1871. 



Trimerblla, Billings, 1862. 

 Rhinobolus, Hall, 1874. 



Order Diaca0lia, or Discinacea, Waagen. 



Family DISCINIDJK, Gray. 



Discinolepis, Waagen, 1885. Lingulodiscina, Whitfield, 1890. 



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



ScHizoBOLUS, Ulrich, 1886. Schizotreta, Kutorga, 1848. 



Trematis, Sharpe, 1847. Lindstr(Emella, Hall, 1892. 



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

 (Ehlertella, Hall, 1892. 



Family SIPHONOTRETID^ Kutoboa. 



AcROTHELE, Linnarsson, 1876. 

 LiNNARSsoNiA, Walcott, 1885. 

 DisciNOPSis, Matthew, 1892. 

 AcROTRETA, Kutorga, 1848. 

 CoNOTRETA, Walcott, 1889. 

 Mesotreta, Kutorga, 1848. 



ScHiz AMBON, Walcott, 1884. 

 SiPHONOTRETA, de Vemeuil, 1845. 

 Orbicella, d'Orbigny, 1849. 



Keyserlingia, Pander, 1861. 

 Helmersenia, Pander, 1861. 



Order Gastropegmata, or Craniacea, Waagen. 



Family CRANIID^ King. 



Crania, Retzius, 1781. Cnopew, Poli, 1791. 



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



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



