I'T.ATE CXV— Continue!. 

 Fig. 24. A later stage in the development of the tubes, exhibiting the same mode of growth. In this speci- 

 men tin- invynkir aminl.il wn- :in<l the Inn- longitudinal striae are very distinct. 

 ] I udsQn Rn er "coup. ' < . ■ ' ""'"■ 



Fig. 25. The upper surface of an i ny, the' tulips ofwhich' are of unusually large size and are 



not \\ 1 1 o 11 \ connate. 

 26. The under surface of the same specimen, showing th.- point of attachment of the tubes, the orna- 

 ntation ol allsand ■■> yonnger colony attached usay the apices of the' larger tubes. 



Hudson River group. Gineinmati </'■""/'■ 

 Fig!. -7. A large colon; representing the adnascenl habit of growth, attached to a valve of StropJwmena 

 alternata. The specimen has been somewhat weathered, the walls of the. tubes being largely 

 ,. nM |,.,l. This is the stage of dew >p len in the species Ortonia eo tiicff, Nicholson, and 



Conchieol.ites copruoatnis, Nicholson; 



Nielsen Rivergironp. Ginevnnati, Ohio* 

 Fig. 28. A stage of growth in which the tubes are gently Bexuous and mostly free the annulations quite 

 regular and the longitudinal strite distinct. This is a condition directly comparable to that 

 ,-,.],, ,i figures •">. 6 and 7. and has been described by Mr. S. A. Miller, under the name 



Tentaculites Richmondewds. The same or a closely similar condition of development is repre- 

 sented b i'es Tentaculites tenuist/riatmSi Meek and Worthen,; 

 Hudson Rivei'^group. Richmond, Indiana 

 Fig. -"■'. Another specimen representing the same stage of development. 



Hudson River group. Rtehmmtd, Indiana. 

 Fig. 30. A th ii-il -| ecimen.enlarged to three diameters, sb >wing more distinctly the character of the surface 

 ni.i rkings. 



Hudson River group. Richmond, Indiana. 

 Fig. 31. To hes in a condition of growth eloselj similar to that of the preceding specimens, the annulations 

 being somew hat less regular This is lie- 35 ntaenlites hit urwu) el' Shumard, page IS. 

 Hudson River group. A r efl»YK?api GrirardeaM, Missouri- 



Fig. 32. A longitudinal secti f the tul I ites SterUngensiSrMpek. ami Wet-then, enlarged to 



five diameters, showing the.thicknesS of the, walls. 

 Hudson River group. Cincinnati, Ohio. 

 Fig. 33. Longitudinal sections of two adnascent tubes similar to those represented in figures 9 and 10. 

 enlarged to three diameters showing the thickness of the walls. 

 Hudson River group GiiuAnnati, <>h'it>. 

 Fig. Ml. Longitudinal sections of portions of two .similar tidies, enlarged to three diameters, showing thicker 

 and coarsely cellular walls 



Hudson River-group. Cincinnati, Ohio. 

 Fig. 35. A small specimen of the Tentaculites Riahmwkdensis, Miller, showing the thick walls. The appar- 

 ent transverse septa are the edges of the internal annulations, Enlarged to three diameters. 

 Hudson River group. Richmond, Indiana. 

 Fig :3ri. A longitudinal section of the Tentacnlites Riehimmdensis, Miller, enlarged to six diameters, show- 

 ing the cellular structure of the thick wall. 



Hudson Riveit group. Richmond, Indiatut, 

 Fig. :i7 A longitudinal section of the same form of growth, enlarged to live diameters. 



Hudson River group. Richmond, Indiana. 

 Fig. 3S. Longitudinal Bectiohs of two individuals of the Tentaculites Richnymdensis, Miller, enlarged to 



tin- liameters, showing the thickness of the walls. 



Hudson River group. RiChmo7id, Indiana 

 Fig. 39. Sections of tubes in a similar stage of development, enlarged to three diameters. The apparent 

 septate character of the apical portion of the longer tube is due to successive depositions of 

 the calcareous tilline;. 



Hudson River group. Richmond, Indiana. 

 Fig. t:s. A broken tube attached tea valveiof Streptrohyiichusplano-conyexus, showing the annulations on 

 the nine,- surl'.-e-e of tlie wall, which give an apparent septate character to the tube. 

 Hudson River group. ' "nn ■■inn/iti. Ohio. 



CoiiXl t.ITES IMMATt'KLJS. 

 Page 18. 

 Fig. 40. Tubes in a verj eat l.\ si rpuloid sttige of development, similar to that represented in figs. 2 and 4, 

 attached to the surface of Orthoceras. 



Utica slate. Hdlland Patent, Oneidacounty. 



CoRNULITES FLEXUOSUS. 

 Page IS. 



Fig. 41. The original sj imen of Tentaculites ? fiexuosus, Hall, exhibiting a diffusely radiating mode of 



growth, the character of the tubes being similar to that represented in figures 9, 10 and 11, the 

 tubes being more slender and proportionally mere elongate. The individuals tire attached to a 

 valve of Stropho7nena alternata. Enlarged to 'v. < diameters. 

 Treuton limestone. Lowville, Lewis county. 

 Fig 12, A ingle tube of this form, enlarged to two diameter arid retaining the embryonal tip. 

 Trenton limestone Lowville, Lewis-county. 



