19 Echin. 
Systematic — Echinoidea. 
1031 
' \Cardiaster with C. eurtus sp. n. 
Mesozoic U.S.A., Clark & Twitchell 
U.S. Geol. Surv. 54 pp. 83-84 pi. xxxvii 
figs. la-h. 
f Cassidulus with C. conoideus sp. n. 
Mesozoic U.S. A. Clark & Twitchell 
U. S. Geol. Surv. 54 pp. 74-81 pi. xxvii 
figs. 3a-d ; C. with C. (Rhyncopygus ?) 
holmesi (R.) rciveneli, depressus, C. 
(Pygorhynphus) carolinensis, georgiensis, 
alabamenais, bassleri, berryi spp. n, 
Cainozoic U.S. A., Clark & Twitchell 
U.S. Geol. Surv. 54 pp. 140-147, 170- 
172, 211, 220 pis. Ixv fig. 3a-d, 5a-d ; 
lxvi figs, la-c, 2a-b, 4a-e, 5a- b ; lxvii 
figs. 2a-g ; Ixxix figs. 2a-d ; lxxx figs. 
3a-d ; xcv figs. 5a-d ; ci figs. 3a-d ; 
C. taramellii sp. n. Eocene, Italy Dai- 
nelli L’Eocene friulano Florence 1915 ; 
C. Cooke 50. 
1 \Catopygus , Clark & Twitchell 49. 
Centreehinus savignyi, Clark 41 ; 
C. Cary 22. 
Centrosteplianus rodqersii, Mortensen 
149. 
f Chirodota, Clark & Twitchell 49. 
Cidaris tribuloides Tennent 205. 
f Cidaris with C. pratti, smithi, 
georgiana spp. n. Cainozoic U.S. A., 
Clark & Twitchell U. S. Geol. Surv. 
54 pp. 113-116, 158-159, 179 pis. lv 
fig. 3 ; lxxii figs. 2a-c, 3, 4 ; O. with G. 
shastensis, dilleri, plumasensis, teha- 
maensis spp. n. Mesozoic U.S. A. Clark 
& Twitchell U. S. Geol. Surv. 54 pp. 23, 
31, 44 pi. i figs. 5, 6 ; iv fig. 3 ; ix fig. 1. 
Clypeaster pallidus West Indies ; 
europaci ficus Tropical Pacific ; ochrus 
Mexico spp. n. C. lampus nom. n. for 
C. latissimus A. Agassiz, 1883, Clark 
Mem. Mus. Comp. Zool. Harvard Coll. 
46 pp. 25-42 pi. 141 figs. 1-3 ; C. with 
C. joubini sp. n. W. Indies, Lambert 
Lyon Ann. soc. linn. 51 p. 285. 
f Clypeaster with C. Dandolei sp. n., 
Miocene Sardinia, Lovisato Roma. Roll. 
Comitato geol. 44 pp. 179-193 figs. 1-4 
c ; C. pomai, canali, zambellii , scarsel- 
linii, tazzolii, griolii, sperii spp. n. 
Miocene Sardinia, Lovisato Riv. ital. 
paleont. Perugia 20 pp. 89-90 pi. 1 figs. 
l-7d ; C. oippsJanrficus, Gregory 86 ; C. 
Airagiii, 1; Clark, 41 & 45- Clark & 
Twitchell, 49 ; Stengler, 199. 
^Clypeus mulleri Odling 158. 
( n -8913 m) 
f Coclophorus with C. aldiichi, sloan , 
spp. n. Cainozoic U.S.A., Clark & 
Twitchell U. S. Geol. Surv. 54 pp. 117, 
158, 180-181 pis. lxxiii figs. 6a-b, 7a- 
c ; lxxxiv figs 5a-b. 
f Coelopleurus anaudi Lambert 117. 
f Gollyrites elliptica Petitclerc 167. 
\Conochypeus stefaninii sp. n. Eocene 
Italy, Dainelli L’Eocene friulano 
Florence 1915. 
^Coptechinua bittneri sp. n. Eocene, 
Italy, Dainelli L’Eocene friulano 
Florence 1915. 
"f Coptosoma Clark & Twitchell 49. 
f Cottaldia rotula sp. n. Mesozoic, 
U.S.A., Clark & Twitchell U.S. Geol. 
Surv. 54 p. 57 pi. xx figs. la-d. 
t Cyphosoma Clark & Twitchell 49. 
]Dendrasler with D. arnoldi , coaling- 
aensis spp. n. Cainozoic, U.S.A., 
Clark & Twitchell U.S. Geol. Surv. 54 
pp. 190-197, 216, 223 pis. lxxxviii figs. 
4a-d ; xo figs. 2a-c. 
Diaderna sctosum Jacobs 108. 
■ fDiplopodia Clark & Twitchell 49. 
| Diplothecanthus with D. dalli sp. n. 
Cainozoic, U.S. A., Clark & Twitchell 
U.S. Geol. Surv. 54 pp. 218-219 pis. 
xcix figs. 2a-b ; c. figs, la-b ; D. 
Brown 20. 
| Discoidea cylindrica Brooks, 19; 
North, 156. 
t Duncaniaster Gregory 86. 
| Echinanthus with E. georgiensis sp. n. 
Cainozoic, U.S.A., Clark & Twitchell 
U.S. geol. Surv. 54 p. 67, 139 pi. Ixv 
fig. la-d ; E. Lambert 120. 
Echinarachnius parma var obesa var. 
n. N. Pacific, Clark Mem. Mus. Comp. 
Zool. Harvard Coll. 46 p. 67 pi 143 
figs. 5-8. 
| Echinarachnius Clark & Twitchell 
49. 
\Echinobrissus with E. angustatus 
sp. n. Mesozoic, U.S. A., Clark & 
Twitchell U.S. Geol. Surv. 54 pp. 69- 
70 pi. xxvii figs. 2a-c ; E. woodwardi , 
clunicularis , Odling 158. 
Echinocardinm cordatum Medes, 138 ; 
Pixell-Goodrioii, 170. 
a 8-2 
