AKCHI-VOS- DO MUSEU NACIONAL 



51 



da dos schistos Devonianos inferiores de 

 Roumeli-Hissar e do Helderbcrg inferior 

 New-York . 



Conclusão — As opiniões alii expressas 

 são derivadas doestado dasTrilobitas so- 

 mente e portantode valorrestrictonasua 

 applicação ao conjancto das faunas dos 

 grez de Ereré e Maecurù. Já ha descripto 

 do districto Ereré-Monte Alegre trinta e 

 seis espécies de fosseis devonianos dos 

 quaes vinte são de Brachiopodes des- 

 criptos pelo Prof. Ralhbun, uma de Pte- 

 ropodes, oito de Lamellibranchios, cinco 

 de Gastéropodes e duas de Tri lobitas des- 

 criptas pelos Professores Hartt e Ralhbun. 

 Nesta fauna as Trilobitas constituem ele- 

 mento de menor importância e são de 

 apparecimento raro em comparação com 

 as espécies de moliuscos. Os mencionados 

 escriptores teem demostrado uma notável 

 concordância especifica entre a fauna de 

 moliuscos de Ereré e a do grupo Hamilton 

 de Nova-York, concordância fortalecida 

 pela presença em grande abundância das 

 espécies Tropidoleptus carinalus, Com ad 

 e Vitulina pustulosa, Hall, representantes 

 de géneros raros e exclusivamente ame- 

 ricanos. As duas espécies de Trilobitas 

 que aqui se encontram, //o/«aíono;MsO tara 

 e Dalinanites ( Cryphaeus ) Paituna, são 

 em completa harmonia com a fauna Ha- 

 milton, e a julgar de nossos conhecimentos 

 actuaes, a fauna inteira pareceria um de- 

 rivativo da mais extensa (isto é, mais com- 

 pletamente conhecida ) fauna Hamilton de 

 Nova-York . 



A fauna de moliuscos do Rio Maecurú, 



Hissar and the lower Helderberg of 

 New- York. 



Conclusion — The opinions here ex- 

 pressed are derived from a study of the 

 Trilobites alone, and are therefore of 

 restricted value in their application to the 

 entire faunas of the Ereré and Maecurú 

 sandstones . Already there are described 

 from the Ereré-Monte Alegre distict thirty 

 six species of Devonian fossils, of which 

 twenty species are Brachiopods described 

 by Prof. Rathbun, one species of Ptero- 

 pods, eight of Lamcllibranchiata, Ave of 

 Gasteropods and two of Trilobits described 

 by Professors Hartt and Rathbun. In this 

 fauna the trilobites are a minor element 

 and of rare occurrence in comparison 

 with the molluscan species. The writers 

 mentioned have demonstrated a i-emark- 

 ablc specific agreement in the molluscan 

 fauna of Ereré and that of the Hamilton 

 group of New- York, this agreement being 

 fortified by the presence in great abun- 

 dance of the species Tropidoleptus carin- 

 attis, Conrad and Vitulina pustulosa, Hall, 

 representatives of rare and exclusively 

 American genera. The two species of trilo- 

 bites occurring here, Homalonohis Oiara 

 and Dabnanites (Cryphaeus) Pailuna, are 

 in entire harmony with this Hamilton 

 fauna and from present evidence the 

 entire fauna would appear to be a deri- 

 vative of the more extensive ( that is to 

 say, more completely known) Hamilton 

 fauna of New-York. 



The molluscan fauna of the river Mae^- 



