176 Annals of the Carnegie Museum. 



Tlie Classification and Distribution of Hamilton and Chemung Series of Central 



and Eastern New York. 15th Ann. Rept. State Geol. N. Y., 1895. 

 R.AYMOND, P. E. The Developmental Changes in some Common Devonian Bra- 



chiopoda. Am. Jour. Sci. (4), Vol. XVII, 1904. 

 SCHUCHERT, C. Synopsis of Am. Foss. Brachiopoda. Bull. U. S. Geol. Survey, 



No. 87, 1897. 

 Talbot, Mignon. A contribution to a list of the Fauna of the Stafford Limestone 



of New York. Am. Jour. Sci., Vol. XVI, 1903. 

 Williams, H. S. Shifting of Faunas as a Problem of Stratigraphic Geology. Bull. 



Geol. Soc. Am., Vol. XIV, pp. 177-190. Apr., 1903. 

 Correlation of Geological Faunas : A Contribution to Devonian Paleontology. 



Bull. 210, U. S. Geol. Surv. 



Explanation of Plates.^ 

 Plate I. 

 Pholidops Iiatiiilto)iii£ Hall. 

 Rows I and 2. Series of dorsal valves. X 2. 

 Rows 3 and 4. Series of ventral valves. 'X 2. 



Plate II. 



Pholidops oblata Hall. 



Rows I and 2. Series of dorsal valves. X 2. 

 Rows 3 and 4. Series of ventral valves. X 2. 



Plate III. 



Row I. Partial series of .SV;Y)///<^cifl'(9«/rt/<';-//rt;/;7 Conrad ; ventral valves. Speci- 

 mens Nos. 3-9 show well the mucronate cardinal extremities of the adolescent in- 

 dividuals. 



Rows 2-4. Series of Stropheodouta hucqiiistriaia Conrad ; ventral valves, .'^hewing 

 the shells in neanic, ephebic, and gerontic stages. 



Plate IV. 

 Chouetes scitiilits Hall. 

 Rows I and 2. Series of ventral valves. X 2. 

 Rows 3 and 4. Series of dorsal valves : interior view. X 2. 

 Specimens Nos. I and 2 of Row i , and Nos. i and 2 of Row 3, show the ventral 

 sinus and dorsal fold of the very young stages. Most of the specimens in Row 4 show 

 the brachial scars. 



Plate V. 



Row I. Partial series of Orthotlieles chenntngensis var. pectenacea Hall ; dorsal 

 valves. X 2. 



Row 2. Partial series of Orthothetes clioiiungensis var. arctislriattis Hall ; dorsal 

 valves. X 2. 



' Unless otherwise stated, the figures are natural size. 



