Figs. 1 to 
4 
Figs. 5and 6 
Figs. 7 to 
Figs. 10 to 
9 
7 
8 
) 
14 
10 
11 
12 and 13 
Vig. 
14 
15 
Figs. 16 and 17 
Figs. 18 and 19 
Figs. 20 to 
21 to 
Figs. 25 to 
Figs. 28 to 
24 
20 
23 
24 
27 
30 
PLATE LXXIV. 
PAGE. 
HM COMEIOPTERUSEBE TL OLDEN SIS Ue ll Cis lraeriiste ieee er istsielialts «letelcisisyatsteletehaleraieie = clevelaie r= 1032 
(See also plate LXII, fig. 70.) 
Four views of a cast of the interior. Lines of growth are indicated on the 
outer half of the last turn, somewhat obscurely, it is true, yet unmistakably. 
Stones River group, Beloit, Wisconsin. 
ECOVEIOPTH RUS CLR LANG UU GS! WAST CLG WS) etaeretee <lelersieisteretatelelele el \elalel= elcloletele =iclcieleleieter= 1031 
(See also plate LXII, fig. 73.) . 
Two views of a cast of the interior. There is some doubt respecting the 
character of the inner whorl. It may form a closely coiled nucleus, but we 
doubt it. Calciferous formation, Providence Island, Vermont. 
ECCYLIOPTERUS VOLUTATUS Whitfield sp..............:.. 1 eee cee eee ee eee eee e es 1031 
(See also plate LXII, figs. 71-72.) 
Lateral view of a cast of the interior, preserving a portion of the ‘‘ collar-like ” 
upper carina. Calciferous formation, Fort Cassin, Vermont. 
Under side of another cast from the same locality. 
Small portion of the shell from the inner or rather upper slope, beginning at 
the inner basal angle and extending upward almost to the base of the 
“collar.” Shows the strong anterior convexity of the lines of growth. Fort 
Cassin, Vermont. : 
ECCYLIOPTERUS OWENANUS Meek and Worthen sp.............-200eeeeeeee rece es 1032 
Lateral view of a cast of the interior including the enormous “collar.” The 
stony matter which lies upon the concave spire is not represented in the 
drawing, causing the latter to appear like the shell itself. Fusispira bed of 
the Trenton group, Wykoff, Minnesota. 
Vertical section of another specimen from Wykoff. e 
Lateral and basal views of a cast of the 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. 
Upper sidé of a specimen from the shaly portion of the Fusispira bed in 
Goodhue county. Shows an impression of the “collar” on the inner turns. 
HBTICOTOMA PLANUIADAL Vara ROBUSTA Wa and) Sere seccs dee cescscee cesses a 1033 
Lateral view of the specimen described. 
JEU HTICONKONON, Teco, Chilli eoegopodeageadn A500n0 code nauaduOobn bob bode SosDuaROUS 1033 
Lateral and basal views of a typical example of this species. Black River 
limestone, Pauquette’s Rapids, Canada. 
SUAPICOROMA. TAIT) WAlAG.ocgnescose oso bevosc05 boon GoDedeon HoacnadbUGounoas 1035 
(See also plate LXII, fig. 69.) 
Basal and lateral views of a cast of the interior. Stones River group, High 
Bridge, Kentucky. 
EGE EL COLOMABMENINESSHENGTSH SAiiOLG Gece saeircsinsiceioseiiceiactennenen 1034 
Upper side of a good silicified 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. planulatoides. Stones River group, Mur- 
freesboro, Tennessee. 
Three views of another specimen, from the same locality. 
The upper angle and portions of the surface on each side of it, x2. 
FEET COLON AG UIMBIETCAT AMO ANG IS eee eee rash ecieincsciemcie cece sconce ier ay iotsietates 1034 
(See also plate LXII, fig. 68.) 
Three views of the largest specimen seen. Stones River group, near La Salle, 
Illinois. 
EDM ECONO MAU PANU EATON ES) Wilrich seeen cenieericinncceciecie sec alrite cists 2 cries 1034 
Three views of an entire silicified specimen. Black River group, Mercer county, 
Kentucky. 
