1 Arachn. 
Systematic. — Trilobita. 
2831 
Trilobita list of N. American Silurian 
species, Weller Gh'cago Acad. Sci. 
Bull. Nat. Hist. Surv. No. 4 pp. 185- 
212 . 
Acidaspis emarginata synonymy 
. 22, kuckersiana var. n. mickwitri 
ilurian, East Baltic p. 23 pi. i f, 19, 
Schmidt, St. Peterburg, Mem. Ac. Sc. 20, 
No. 8. — A. vanhornei sp. n. Illinois, 
Silurian, Weller, Chicago Acad. Sci., 
Bull. Nat. Hist. Surv. No. 4 p. 251 
pi. xxiii IT. 3-4. 
Aeglina rediviva described, Fearn- 
sides, Elles & Smith Proc. R. Irish 
Acad. 26 Sect. B. p. 123 pi. viii ff. 14- 
16. — A. umbonaba description, Moberg 
Stockholm Geol. For. Forh. 29 pp. 257- 
264 with pi. 
Agnostus gibbus var. schi<f>tzii figured, 
Br^gger Norges geol. CJnd. No. 35 
pp. 133-135 pi. IT. 6-7. 
Ampyx chinensis sp. n. China, Ordo- 
vician, Weller Washington Smith- 
sonian Inst. U. S. Nation. Mus. Proc. 
32 p. 559. — A. knyrkoi sp. n. Silurian, 
East Baltic, Schmidt St. Peterburg 
Mem. Ac. Sc. 20 No. 8 p. 65 pi. iii, 
f. 12. 
Asaphus description pp. 4-15, key to 
species p. 15, eichwaldi p. 41 pi. iv 
ff. 6, 9-11, pi. xii. ff. 20-21, sp. n., 
cornutus holmi p. 50 pi. iv f. 8, latus 
plaatini p, 64 pi. vi ff. 1-3, ludibundus 
itferensis p. 77 pi. viii ff. 12-14, pi. xii 
f; 27, l. jewensis p. 78 pi. viii ff. 15-19, 
l. kegelensis p. 81 pi. ix ff. 1-6, varr. n., 
Silurian, East Baltic, Schmidt St. Peter- 
burg Mem. Ac. Sc. ser. 8 12. — A.lepidus 
figured, Schmidt op. cit. 20 No. 8 p. 71 
pi. iii f. 14. — A. blachwelderi p. 560, 
taningensis, asiaticus p. 561, laevis , 
chinensis p. 562, spp. n. China, Ordovi- 
cian, Weller Washington Smithsonian 
Inst. U. S. Nation. Mus. Proc. 32. 
Arctinurus v.hicagoensis sp. n. Illinois, 
Silurian, p. 248 pi. xxiii ff. 7-8, pi. xxii 
f. 14, occidentalis description p. 247 
pi. xx ff. 10-12, Weller Chicago Acad. 
Sci. Bull. Nat. Hist. Surv. No. 4. 
Bronteus acamas description, Weller 
Chicago Acad. Sci. Bull. Nat. Hist. 
Surv. No. 4 p. 232 pi. xx 1 1. — B. 
barrandii majus var. n. New Brunswick, 
Devonian, Clarke New York State Mus. 
Bull. No. 107. — B, alpiuus sp. n. 
Devonian, Carnic Alps, Gortani 
Palaeontogr. Italica 13 p. 51 pi.. ii [v] 
f. 26. 
Calymmene synopsis of species pp, 52- 
53, tuberculata p. 53 pi. iii f. 1, con- 
spicua, spectabiUs p. 55 ff. 2-5,. 7-8* 
volborthi p. 58 f. 9, descriptions, laevi- 
gata sp. n. Silurian, East Baltic p. 54 
pi. iii f. 6, Schmidt St. Peterburg Mem: 
Ac. Sc. 20 No. 8. — C. birmaniea sp. n. 
Ordovician, N. Shan States, Reed Pal. 
Ind. 2 No. 3 p. 71 pi. v f. 27.-0, blu- 
menbachi var. Silurian* N. Shan States* 
Reed l.c. p. 134 pi. vii f. 25. — O. con*- 
spicna, Unterschied von, C. spectabiUs 
p. 803, laevis , in Esthland p. 804, 
Schmidt St. Peterburg Bull. Ac, sc; 
1907. — O. niagarcnsis description, 
Weller Chicago Acad. Sci. Bull. Nat. 
Hist. Surv. No. 4 p. 261 pi. xxiii 
ff. 9-10. 
Ceratocephala goniata description, 
Weller Chicago Acad. Sci. Bull. Nat. 
Hist. Surv. No. 4 p. 255 pi. xxiii ff. 1-2. 
— O. robinia sp. n. Quebec, Devonian, 
Clarke New York State Mus. Bull. No. 
107 p. 171. 
Ceraurus hydei sp. n. Illinois, Silur- 
ian p. 264 pi. xxiv f. 22, niagarensis 
description p. 263 ff. 20-21, Weller 
Chicago Acad. Sci. Bull. Hist. Surv. 
No. 4. 
Cheirurus near bimueronatas p. 135, 
pi. vii f. 26, incxpectatus sp. n. p. 136 
f. 24, Silurian, N. Shan States, Reed Pal 1 . 
Ind. 2 No. 3. — O. ingricus p. 8 pi. i f. A, 
spinulosus p. 9 f. 5 figured, primigenus 
lomanskii var. n. p. 99 f. 3, ostbaltischer 
Silur, Schmidt St. Peterburg Mein, Ac. 
Sc. 20 pt. 8. — O. sternbergi p. 52 pi. ii 
[v] ff. 27-28, pengelli p. 53 f. 29, descrip 
tions, Gortani Palaeontogr. Ital, 13. 
Cordania gasepiou sp. n. Quebec, 
Devonian, Clarke New York State Mus. 
Bull., No. 107, p. 172. 
Corydocephalns phlyctainodes descrip- 
tion, Weller Chicago Acad. Sci. Bull. 
Nat. Hist. Surv. No. 4 p. 234 pi. xxii 
ff. 1-4. 
Crotalurus barrandei figured, Schmidt 
St.. Peterburg M&n. Ac. Sc. 20 No. 8 
p. 15 pi. 1 ff. 9-11. 
Cryphaeus atavus sp. n. Carboniferous, 
Westphalia, Schmidt Monatsb. Deutsch. 
geol. Gesell. 1907 p. 10. 
Cybele bellatida p. 17 pi. i ff. 13-1 5; 
var. n. wohrmanni Silurian East Baltic 
