6 Araihn . XI. Arachnida. 
Acidaspis trentonensis p. 61 pi. vi, 
Raymond t.o. — A. ulrichi sp. n. Ordo- 
vician Maryland p. 355 pi. xxxvii, 
Bassler Maryland geol. surv. Cambrian 
Ordovic. 1919. — A. ( Pseudomonaspis) 
bucco sp. n. Devonian, Auburg, Rhine 
p. 144 text- fig., Richter Wiesbaden 
Jahrb. Ver. Natk. 70. 
Acrolichas p. 29, nan away i sp. n. 
Ordovician Ottawa p. 31, list of spp. 
p. 30, 41-46 pis. i-iv, Foerste Amor. J. 
Sci. 49. 
Actinopeltis globosus p. 106 text-fig., 
Barton Washington Univ. Studies 3. 
Amphilichas trentonensis p. 354 pi. li, 
Bassler Maryland geol. surv. Cambrian 
Ordovic. 1919. 
Ampyx (Lonchodomas) normalis p. 336 
pi. xlv, halli p. 337 pi. xxxix, Bassler 
t.c. 
Anacheirurus frederici p. 112 text- 
fig., Barton Washington Univ. Studies 
3 
Anisonotuf) gen. n. p. 277 Endymionii- 
dae, glacialis sp. n. Ordovician, New- 
foundland, Raymond Bui. Mus. comp, 
zool. Harvard 64. 
Areia bohemica p. 121 text- fig.. 
Barton Washington Univ. Studies 3. 
Asaphellus gyracanthus p. 345 pi. 
xxxii, Bassler Maryland geol. surv. 
Cambrian Ordovic. 1919. 
Bronteopsis gregaria sp. n. Ordovician 
N. America p. 283, Raymond Bui. 
mus. comp. zool. Harvard 64. 
Bumastus trentonensis p. 351 pi. li, 
Bassler Maryland geol. surv. Cambrian 
Ordovic. 1919. 
Calymene p. 46 appendages comp, 
with Ceraurus and Triarthrus, senaria 
p. 52 sp. ? p. 56 pi. vi, text-figs., Ray- 
mond Conn. Mem. Acad. Arts Sci. 7. 
C. granulosa p t . 356 pi. lvi, senaria p. 357 
pi. li, Bassler Maryland geol. surv. 
Cambrian Ordovic. 1919. 
Ceralocephala phalaenocephala sp. n. 
Silurian, N.S Wales p. 850 pi. xlvii, 
Mitchell Proc. Linn. Soc. N.S. Wales 
44. 
Ceraurinus marginatus p. 133 text- 
figs., Barton Washington Univ. Studies 
3. 
-Gigantostraca. [1920] 
Ceraurus pleurexanthemus p. 135 
text-fig.. Barton t.c. — p. 358 ph xliii, 
Bassler Maryland geol. surv. Cam- 
brian Ordovic. 1919. — pi 57 pi. xi 
text-figs., Raymond Conn. Mem. Acad. 
Arts Sci. 7. 
Cheirurinae keys to genera p. 103, 
Barton Washington Univ. Studies 3. 
Cheirurus insignis p. 129 text-fig., 
Barton t.c. — C. sternbergi p. 128 pi. i, 
Ferroniere Nantes Bui. soc. sci. Ser. 
iii 6. — C. sternbergi , mut. myops p. 149 
text-fig., Richter Wiesbaden Jahrb. 
Ver. Natk. 70. 
Crotalocephalus articulata p. 132 text- 
fig., Barton Washington Univ. Studies 
3. 
Cryptolithus bellulus p. 333 pi. lvi, 
recurvus sp. n. Ordovician Maryland 
p. 335 pi. lvi, tesselalus p. 335 pis. li-lii, 
Bassler Maryland geol. surv. Cam- 
brian . Ordovic. 1919. — C. tessellatus 
p. 61, p. 158 pis. vi-ix text-figs., Ray- 
mond Conn. Mem. Acad. Arts Sci. 7. 
Cyphaspis filmeri sp. n. Silurian 
N.S. Wales p. 855 pi. xlvii, Mitchell 
Proc. Linn. Soc. N.S. Wales 44. — C. 
gaultieri p. 129, convexa p. 130, hydro - 
cephala p. 131, pi. i, Ferroniere 
Nantes Bui. soc. sci. Ser. iii 6. — C. 
matutina p. 353 pi. li, Bassler Maryland 
geol. surv. Cambrian Ordovic. 1919. 
Cyrtometopus clavifrons p. 108 text- 
fig., Barton Washington Univ. Studies 
3. 
Dalmanites purduei p. 148, retusus 
p. 149 spp. n. Devonian, Tennessee pi. 
v, Dunbar Conn. Trans. Acad. Arts 
Sci. 23. — D. ( asteropyge ) laciniatus 
p. 346, Reed Geol. Mag. 57. 
Dionideidae, fam. nov. p. 274 for 
Trinucleidae part., Raymond Bui. 
Mus. comp. zool. Harvard 64. 
Dionide holdoni p. 275, contrita 
p. 276, spp. n. Ordovician N. America, 
Raymond t.c. 
Dolichometopus sp. p. 338 pi. xxvi, 
Bassler Maryland geol. surv. Cam- 
brian Ordovic. 1919. 
Eccoptochile claviger, scuticaudus p. 
104 text-figs., Barton Washington 
Univ. Studies 3. 
