INDEX TO LOWER SILURIC SHALES OF MOHAWK VALLEY 149 



Martinsburg shale, 13, 50 

 Mastigograptus, 28, 49 



sp., 42, 48 



circinalis, 30 



simplex, 27, 41, 48 



tenuiramosus, 27 

 Mather, W. W., cited, 69, 9, 33, 40, 



47 



Matthew, W. D., cited, 70 

 Meadowdale, 50 

 Mechanicville, 12 

 Meek, F. B., cited, 70 

 Mesograptus, 80 



See also Diplograptus 

 Mesotrypa quebecensis, 33 

 Miller, S. A., cited, 70, 89, 118, 122, 



123 



Miller, W. J., cited, 12, 13, 27, 73 

 Minaville, section, 10, 17 

 Modiolopsis sp., 35 



arguta, 97 



milled, 97 



cf. modiolaris, 42 



mytiloides, 20 

 Mohawk river, 58 

 Mohawk valley, 10, 14; table of Cin- 



cinnatian and upper Mohawkian 



groups, 68 

 Monticulipora (Prasopora) lyco- 



perdon, 10, 20, 21, 43 

 Morphy's creek, 16, 19 

 Moyer creek, 10, 15, 34 

 Murchisonia bellicincta, 20 



gracilis, 20 



(Lophospira) uniangulata var. ab- 



breviata, 62 



Nematopora ovalis, 21 



Nickles, J. M., cited, 72, 119, 121 



Nine Mile creek, 27 



Normanskill, 47 



Normanskill shale, 8, 9, n, 12, 14, 



39, 64 



Nuculites poststriata, 104 

 Nuttainia concentrica, 33 



Olenus undulostriatus, 117, 118 

 Oncoceras? sp., 115 

 Oneida conglomerate, 8 

 Orbiculoidea sp., 10, 43, 49 

 tenuistriata, 36, 91 



Orthis, 10 



(Dinorthis) pectinella var. semi- 



ovalis, 21 



(Plaesiomys) retrorsa, 64, 65 

 (Dalmanella) testudinaria, 10, 20, 



5i 



Orthoceras, 114 

 sp., 10, 1 6, 17, 23, 24, 25, 26, 35, 



36,48 



cf. amplicameratum, 32 

 arcuolineatum, 33, 112 

 hudsonicum, 31, 112-15 

 lineolatum, 62 

 oneidense, 113 

 tenuitextum, 62, 113 

 Orthodesma? subcarinatum, 60, 62, 



96-97 



subnasutum, 97 

 Oswego sandstone, 37 



Pachydictya acuta, 21, 6 1 



pumila, 21, 22 



Paleontological notes, 73-123 

 Paleschara ulrichi, 60, 61, 90, 91 



figure, 90 

 Parastrophia hemiplicata, 60, 61, 64, 



65 



Parks, cited, 89 

 Phaenopora incipiens, 21, 22 

 Pholidops trentonensis, 61 

 Phylloporina reticulata, 21 

 Pilsbry, H. A., acknowledgments 



to, 6; mentioned, 74 

 Plaesiomys loricata, 93 



porcata, 93 

 retrorsa 

 See also Orthis (Plaesiomys) 



retrorsa 



Plates, explanation of, 125-44 

 Platystrophia biforata, 61 

 Plectambonites sp., 51, 61 



centricarinatus, 92 



plicatellus, 51 



sericeus, 10, 20, 23, 33, 34, 43, 92 



typus, 60, 61, 91-92 



var. jugata, 92. 

 Plectorthis plicatella, 49, 61 



sp. cf. whitfieldi, 60, 61, 92-93 

 Pleurograptus linearis, 27, 28 

 Pleurotomaria cf. lenticularis, 62 



