9 Arachn. 
Systematic — E uRYTTERibA. 
2831 
t.c. — E. sp. Coal-measures Nottingham- 
shire, Moysey Qeol. Mag. Dec. v 8 p. 501 
% 5. 
Etimrcus longiccps p. 257 pi. lxxxiv 
ff. 1-6, triangulatus p. 258 pi. lxxxiv 
ff. 7—9, linguatu8, p. 413 ff. 96 97, 
Ordovician, vaningeni Silurian p. 420 
IT. 108-115, spp. n. New York, Clarke 
& Ruedemann N. Y. St. Mus. Mem. 14. 
Hughmilleria magna sp. n. New York 
Ordovician p. 341 pi. lxxxv ff. 11-19, 
Clarke & Ruedemann t.c. 
Onychopterus subg. n. ( Eunypterus ) 
p. 212, Clarke & Ruedemann t.c. 
Pterygotidae fam. n. p. 329, Clarke 
& Ruedemann t.c. 
Pterygotus atlanticus New Brunswick 
Devonian p. 356 pi. lxxix ff. 3-5, 
globlccps New York Silurian p. 374 
pi. lxxxii IT. 1—12, nasutus New York 
Ordovician p. 382 pi. lxxxvi fT. 6-10, 
prolificufs New York Ordovician, p. 383, 
pi. lxxxvi IT. 1-5, vasutua p. 416 IT. 102 
103, normamhillensis p. 416 f. 104, 
New York, Ordovician, spp. n., cobbi 
var. n. juvenis p. 429 ff. 119-121, New 
York, Silurian, Clarke & Ruedemann 
t.c. 
Sidneyia inexpectans , Walcott 
Smithsonian Inst. Misc. Collect. 57 
p. 205 figs. 
Slylonurus limbcitus Ordovician 
p. 295 pi. lxxxv ff. 1-3 5, multispino8U8 
Silurian p. 297 pi. Iff. 9 10, modcstus 
Ordovician p. 415 ff. 99-101, spp. n. 
New York, Clarke & Ruedemann N.Y\ 
St. Mus. Mem. 14. 
Tylopterus subg. n. ( Eurypterus ) 
p. 216, Clarke & Ruedemann t.c. 
