TABLE [IT. 



. A. 



rnssii, SHELLS and coeals from the carbontfeeotis limestone, anti rnour the adjacent limestones of iowa 



OF the age of the HAMILTON OROTIP OF NEW YORK. 



Tnh. TII. A, Fig. ] . Jtlrupa (N. S. ?), Iowa City. Tliis will probably be found to be a new species, since the corresponding 

 beds of limestone of Devonian date in this country have not yet yielded any ribbed Atrypa. 

 " '2. Spirifcr ligiis. var. (N. S.) Nenv Roolnngliam, Iowa, in limestnnps of the as;e of the Hamilton Group ol 



New York-. 



Tliis Spirifer is ronsiderably ileeper than Fig. 4, Tab. HI., and the ribs apparently fewer in nnm- 



ber, otherwise it has a strong resemblance to that species. The specimens hitherto obtained are 



hardly perfect enough to determine with certainty the identify. 

 " Fig. 3. Avkula (sp. undetermined), from oolitic beds of the Carboniferous Limestone, tliree miles lielow Augusta, 

 < Skunk River, Iowa. 



" Fig. 4. Mrypa cotnis (N. S.) This smooth sp,'=cies of Atrypa is from tlic limestone of the Upper Rapids of the 



Mississippi, of Devonian dale. 

 " Fig. 5. Sirnjjhodoni a < coslala (N. S.) This minute Siropliodontn. ril)l>iMl like n moilern jjecten, is from the 



Davenport Limestone, of Devonian date. 

 " Fig. f>. Pygidium of P/i«to^J.s rca.s.S!»m(-gi)!a^v, three miles below Rockingham, in liineslnnes of Devonian date, 



associated with FcTicstcHa, figs. 10 and 21. 

 " Fig. 7. Choneles lowcnsis (N. S. ?) in the limestones of Iowa dity, of Devonian date. 



" Fig. 8. Spirifer alicnuatus? var. of iS. istriaha;^ in the lime.stones of the Keokuk Rapids of the Mississippi, of 

 carboniferous date. 



This species of Spirifer, which occurs in great abundance in member / of the Lower Series of Cai-boni- 

 ferous Limestone on the Keokuk Rapids of the Mississippi, but rather of a smaller size than the 

 figure here given, belongs, so far as I am able to discover, to the above variety of S. strialus, as given 

 by Verneuil and De Komnck, in their works on Russia and Belginni. 

 The fossil which I have figured differs, however, from the large iS. siriatus in the simplicity of the ribs, 

 their fewer number and greater size, and in these being seldom diohotomous. There are usually bin 

 three ribs in the sinus, the middle one being the largest, and the same number on the botn relet; and 

 twelve to thirteen additional ribs on either side of the sinus. 

 The same beds contain another Spirifer. closely allied to this, and about the same size, which has but a 



single rib in the middle of the sinus. 

 Another Spirifer, of rather larger dimensions, is associated in the same beds with the two preceding^ 

 which is entirely destitute of ribs on either the sinus or bonrrelet, and which approaches in form to 

 the Devonian Spirifer, which occurs in the limestone of Cedar and Iowa Rivers, and which I have 

 named S. euriitcines, except that it has not so wide a cardinal area. I am disposed to consider the 

 first two varieties to be young forms of S. siriatus, wliich in its adult and cliaracteristic form is 

 abundant at the same locality. 

 " Fig. 0. Sirophodonta parva (N. S.), in limestones of the age of the Hamilton Group of New York. 

 " Fig. It). Orlhis (N. S.), allied to lentiformis, from limestones of the age of the Hamilton Group of New York, near 

 New Bufl'alo. 



" Fig. 11. Pentajnems (N. S. ?), from the limestones near Davenport, Iowa. 



" Fig. 12. Slab of Productal Carboniferous Limestone, near Wayne City, Missouri River. 



" Fig. 13. Terebrattda scrpenfma Q), Skunk River, Iowa. Carboniferous. 



" Fig. 14. Stropltodonta diinosa Q), from limestones of the age of the Hamilton Group of New York, near New 

 Buffalo, Iowa. 



" Fig. 15. Terebralida (sp. undet.), from limestones of the age of the Hamilton Group of New York. 

 " Fig. 16. FenestcUa (.sp. undet.), from limestones of the age of the Hamilton Grnnp of New York, near Rocking- 

 ham, Iowa. 



" Fig. 17. Ckonclcs (sp. undet.), a few miles north of Iowa City. 



" Fig. 18. Cast of a Sanguinolaria, from the base of the Carboniferous Limestones, near Burlington. 



" Fig. 19. Gorgoniri, allied to repistcria, in limestone of the age of the Hamilton Group, near Rockingliam. 



'■ Fig. 20. Part of tooth o[ Psaminodus, from the Lower Series of Carboniferous Limestone, on the Keokuk Rapids 



of the Mississippi, associated with Prndiirlus piwctatus and Spirifer nispidatiis. 

 " Fig. 21. Fenesteda Mdlrri ( ?). in limestones nf the age of tlie Hamilton Group of New York. 



