120 



SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. [hvi.l.st. 



pedicle grooves. Muscular scars distiuct, consistiug of two i)airs of 

 adductors and three of sliders, or adjustors. 



Obolella Billings, 1801. 



Dicellomus Hall, 1871. 

 Elkauia Ford, 1886. 



Eillinjisia Ford, 1886. 

 Neobolus AVaagen, 1885. 

 Botsfordia Matthew, 1893. 

 ^Spondylobolus McCoy, 1852. 

 Obohis Eichwald, 1829. 



Ungula Pander, 1830. 

 Ungulites 15ronu, 1848. 

 Aulontreta Kntorga, 1848. 

 Euobolus Mickwitz, 1896. 



Acritis Volborth, 1809. 

 Schmidtia Volborth, 1809 ( not Bals- 



Criv., 1803). 

 Thysanotos Mickwitz, 1890. 

 Leptembolou Mickwitz, 1896. 



3. Family TRIMERELLID^ Davidson and King, 1874. 



Large, thick-shelled, ineqnivalved Obolacea, with the ventral cardi- 

 nal area usually very prominent, triangular, and transversely striated. 

 Adjustors and anterior adductor muscles elevated ui)ou solid or deeply 

 excavated platforms, or spondylia. 



?Lakmina CEhlert, 1887. 



Daviclsonella Waagen, 1885 (not Mii- 

 nier-Chalmas, 1880). 



Lingulobolus Matthew, 1890. 

 Sphicrobolus Matthew, 1890. 

 Dinobolus Hall, 1871. 



Conradia Hall, MS., 1862. 

 Obolellina Billings, 1871. 

 UngulitesQuenstedt, 1871{not Broun, 



1848). 



Monomorella Billings, 1871. 

 Trimerella Billings, 1802. 



Gotlandia Dall, 1870. 

 Rhinobolus Hall, 1874. 



Superfamily LINGULACEA Waagen, 1885 (restricted).' 



Elongate, thin-shelled, burrowing, derived Atremata, with m more or 

 less long, worm-like, tubular, flexible pedicle. 



1. Family LING TILE LLTD.E Schuchert, 1893. 



Spatulate,inequivalved Lingulacea, structurally intermediate between 

 the Obolida^ and Lingulidse. 



Lingulella Salter, 1800. 

 Lingulepis Hall, 1803. 

 Leptobolus Hall, 1871. 



?Paterula Barrande, 1879. 



Cyclus Barrande, 1870. 



?Mickwitzia Schmidt, 1888. 



' Waagen's term Mesokaulia, or Lingulacea, in ba.sed upon the families Obolidie, Trimerellida;, and 

 Lingnlida". Siiico tliis torm has value, and to avoid proposing another, Lingulacea is here restricted 

 to the latter family and two otliors recenlly proi)(isid. Waagen in using lliis term gave a dual series; 

 the second one is hero adopted to conform iu eajdiony with other superfamily terms. 



