1M.ATK IA\I\. 



PAOB. 



Fig*. 1 to 4 BOOTUOrnHHM BBiOmmV U. Md S .............. 1032 



(8* abo pUI LXII. tt. TO.) 



Knur vlewn of a CMt of the Interior. Line* of growth are Indicated on the 

 outer half of the last turn, somewhat otmcurely, It Is true, yet unmistakably. 

 Stonea River group, belolt, Wlsi-onnln. 



Flg. Sand K< 'M.IOFTBKUS TKIANOCLUB WbltOeld sp ........................................ 1031 



(So* mlio pllr LXII. B*. 7S.) 



Two TlewB of a CMt of the Interior. There la some doubt respecting the 

 character of the Inner whorl. It way form a closely colled nucleui, but we 

 doubt It. Calclferouft formation. Providence Island, Vermont. 



7 to ft BCCYLIOFTKKUK VOU'T M I '- Whlltleld dp ......................................... 1031 



(8 tl*o plt. I. XII. flf*. 71-71. 



7 Lateral view of a cast of the Interior, preserving a portion of the "collar-like" 



upper raring. Calclferous formation, Fort Cavil n. \'<Ttunnt. 



8 Under side of another cast from the same locality. 



ft Small portion of the shell from the Inner or rather upper slope, beginning at 

 the Inner l>asal angle and i-stemiing upward almost to the base of th>- 

 - ws thi- strom; ;int.-rior cniiM-xitv of th-' lines of growth. Fort 

 Gassin, Vermont. 



10 to 14 ECCYLIOPTKRUS OWENANK8 Meek litl'l Worlli.iisp .............................. lli:ij 



10 Lateral view of a cast of the interior Including the enormous -collar." Tin- 

 stony matt.T which lies upon the concave spire Is nt represented In the 

 drawing, causing the latter to appear like the shell lUwlf. Fuslsplra bed of 

 t)n- Trenton group, \VykolT, Mlntu-sota. 



1 1 Vertical section of another specimen from Wykoff. 



It and 13 Lateral and basal views of a cast of tin- interior from the same locality. This 

 specimen represents the usual mode of occurrence, very few of the examples 

 seen giving any idea of the high "collar" Into which the outer angle Is 

 continued In the shell itself. 



M Upper side of a specimen from the sbaly portion of the Fuslsplra bed In 

 Goodhue county. Shows an Impression of the "collar" on the Inner turns. 



Fig. 15 HKUCOTOMA PLA.NULATA var. ROBUSTA U. and S .................. ............. 1033 



Lateral view of the specimen described. 



Flga. 10 and 17 MKI.K "TOM A I-I.ANTI.ATA Salter ................................................... 1033 



Lateral and basal views of a typical example of this species. Black lllver 

 limestone, Pauquette's Rapids, Canada. 



Figs. ISand 18 HKLICOTOMA VKKTICALIS Ulrlch ................................................... 1036 



(8M *l*o pl.tr LXII. 8f. .) 



Basal and lateral views of a cast of the Interior. Stones River group, High 

 Bridge, Kentucky. 



Figs. 20 to M HEi.iorniMA TKSXESSEKXSIS Safford .............................................. 1034 



20 Upper side of a good slliclfled shell, showing the small channel along the Inner 

 edge of the whorls which appears to be always present and readily serves In 

 distinguishing this species from H. planulatoidu. Stones River group, Mur- 

 freesboro. Tennessee. 

 -1 to 23 Three views of another specimen, from the same locality. 



4 The upper angle and portions of the surface on each side of i t . 



Figs. K to 27 HKLICOTOMA UMBILICATA Q. aadfl ........... 1034 



Idee atoo plmte LXII. Sit. SLi 



Thrve views of the largest specimen seen. Stones Itiv.-r trmup, near La Salle, 

 Illinois. 



Figs. 28 to 30 HELKXITOMA n.ANri.AT'Ui.Es I'lrlch ........ 1034 



Three views of an entire sillclfled specimen. Black K!V<T group, Mercer county. 

 Kentucky. 



