[Reports volI-XIII] . ECHINOIDS. PLATE XVII. Explanation of Plate XVII. Page Fig, 1. Melonites multipara 125 la. Ambalacrnin (enlarged),lb. Apical disk (enlarged).Ic. laterambnlacralplate (enlarged).Garboniferone, Saint Lonis UoaeBtone. Fig. 2. Oligoporus dantB\ 126 2a. Ambnlacral plates (enlarged).2b. laterambnlacral plates (enlarged).Carboniferous, Keoknk limestone. Fig. 3. Archcsocidaria wortheni 128 3a. Ambnlacralplates (enlarged).3b. Interambalacral plates (enlarged).Carboniferons, Saint Loais limestone. MISSOURI GEOLOGICAL SURVEY. PLATE XVII. ECHINOIDS, STRUCTURE. PLATE XVIII, Explanatio
[Reports volI-XIII] . ECHINOIDS. PLATE XVII. Explanation of Plate XVII. Page Fig, 1. Melonites multipara 125 la. Ambalacrnin (enlarged),lb. Apical disk (enlarged).Ic. laterambnlacralplate (enlarged).Garboniferone, Saint Lonis UoaeBtone. Fig. 2. Oligoporus dantB\ 126 2a. Ambnlacral plates (enlarged).2b. laterambnlacral plates (enlarged).Carboniferous, Keoknk limestone. Fig. 3. Archcsocidaria wortheni 128 3a. Ambnlacralplates (enlarged).3b. Interambalacral plates (enlarged).Carboniferons, Saint Loais limestone. MISSOURI GEOLOGICAL SURVEY. PLATE XVII. ECHINOIDS, STRUCTURE. PLATE XVIII, Explanation op Tlate XVIII. PageFig. 1. Camarocysiites obconicua 132 Lateral aspect (4fCer Meek & Worthen.) SiluriaQ, Trenton 2. CamarocysHtes shumardi 132 Basal view of large spaciiueu. (After Meek and Worthen.) Silurian, Trenton Echinodiscus kaskaskiensis 133 (After Hall.) Carboniferons, Saskaskia 4. Pentremites elongatus 133 Lateral aspect. (Keyes collection ) Carboniferons, Upper Burlington . 5. Pentremites conoidem 13i Side view. (Mns Mo. Geol. Snr ) Carboniferous, Eeoknk limestone. Pentremites sulcatus 135 Side view. (Keyes collection.) Same from above. Carboniferons, Kaskaskialimestone. Crypioblastus melo 139 Lateral view. (Keyes collection.) Same from above. Carboniferons, Lower Barlington limestone. Cryptoblastus kirkwoodensis 139 Side aspect. (Wachsmuth & Springer collection.) Same from above. Carboniferons, Saint Lonis limestone. Schizoblastus sayi 138 Side view. (Iteyes
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