. Smithsonian miscellaneous collections . ore or less crowdedtogether. A drawing (fig. 14) based on this section waspublished in 1881 (fig. 8, pi. 3, Bull. Museum Comp. Zool.,Harvard College, Vol. 8).14. A drawing based on the section represented by fig. 13. The specimens illustrated by figs. 1-14 are now in the Museumof Comparative Zoology at Harvard College, Cambridge, Massa-chusetts. They are from the upper portion of the Trenton limestone, Ordo-vician ; 1 mile ( km.) east of the middle fall of Trenton Falls, onthe West Canada Creek, in the town of Russia, Herkimer County,New York. Wire
. Smithsonian miscellaneous collections . ore or less crowdedtogether. A drawing (fig. 14) based on this section waspublished in 1881 (fig. 8, pi. 3, Bull. Museum Comp. Zool.,Harvard College, Vol. 8).14. A drawing based on the section represented by fig. 13. The specimens illustrated by figs. 1-14 are now in the Museumof Comparative Zoology at Harvard College, Cambridge, Massa-chusetts. They are from the upper portion of the Trenton limestone, Ordo-vician ; 1 mile ( km.) east of the middle fall of Trenton Falls, onthe West Canada Creek, in the town of Russia, Herkimer County,New York. Wire spirals 152 Fig. 10. Untouched photograph of wire spirals which have been set inplaster and filed across so as to obtain sections correspond-ing to those found in enrolled specimens of Calymene Photograph of a white wire spiral against a dark background,illustrating a closely coiled spiral such as those cut acrossin the sections represented by figs. 3-6 and 9.» SMITHSONIAN MISCELLANEOUS COUECTIONS VOL. 67, NO. 4, PL. 28. ORDOVICIAN TRILOBITES NO. 4 APPENDAGES OF TRILOBITES 19/ DESCRIPTION OF PLATE 28 PAGE Ceraurus plcurcxanthemus Green 148 Fig. 1. (X2.) Untouched photograph of the dorsal shield of a speci-men from the thin layer of limestone from which all of thespecimens showing appendages of this species and Ceraurusplcurcxanthemus were obtained. U. S. National Museum,Catalogue No. 18038. 2. Restoration of the interior of the dorsal shield drawn from specimens associated with that represented by fig. I. (AfterWalcott, Ann. Lyceum Nat. Albany, N. Y., Vol. XI,1875, pi. XL Idem, Bull. Museum Comp. Zool., HarvardColl., Vol. VIII, 1881, pi. IV, fig. 5.) 3. Diagrammatic median longitudinal section showing dorsal shield. hypostoma, and outline of ventral membrane (vm), andposition of intestinal canal, based on data obtained fromthin sections and the specimen represented by fig. 4.(After Walcott, i88r, pi. IV, fig. 6, Bull. Museum , Vol. VIII.) 4. (
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