APPENDIX E. PALAEONTOLOGY. 175 



BRYOZOA. 



Archimedipora Archimedes, Lesueur. 

 Paleontology, PI. 1, fig. 6. 

 Retepora arckimedes, Lesueur, 1842, Amer. Jour. Science, XLIII, 19, 



Archimedipora arckimedes, D'Orbig. 1849, Prod, de Palseont. T, 102. 



A fossil peculiar to the carboniferous strata of the western and south- 

 western States. The associate fossils are Pentremites Jlorealis, Pro- 

 ductus punctatus, Spirifer striatus, and Orthis Michelini. D'Orbigny, 

 in his Prodrome de Palseontologie, cites this fossil from rocks of the 

 Devonian period, in Kentucky. This is an error ; we believe it has not 

 been found lower in the series than the encrinital limestones which 

 repose on the fine-grained micaceous sandstones of the knobs of Ken- 

 tucky and Tennessee. 



It occurs in dark-grayish carboniferous limestone, in Washington 

 county, Arkansas. 



BRACHIOPODA. 



Productus punctatus, Martin.* 

 Paleontology, PI. 1, fig. 5, and PI. 2, fig. 1. 



This Productus has a wide geographical, as well as vertical, range in 

 the United States ; it is also widely distributed throughout Europe. In 

 this country we find it commencing with the earliest carboniferous de- 

 posites, and extending through all the limestones of this system to the 

 coal measures. 



Figure 1 of plate 2 represents the ventral valve of a specimen from 

 Washington county, Arkansas ; and figure 5 of plate 2, an individual 

 showing the hinge line and the form of the beak. 



* For synonyms and references, vide Koninck's Monog. du Genre Productus 

 et Chonetes, p. 123. 



