GIGANTOSTRACA. 
Crust, 79 
III. DISTRIBUTION. 
Distribution of Xiphosurce ; Pocock (22). 
Palaeozoic Merostomata of Scotland ; Peach (18) p. 373. 
Permian, Gaskohle von Nyran, Prolimulus , n. sp.; Fritsch (6). 
Carboniferous, Culm Beds, Coddon Hill; n. spp. Trilobita ; Woodward 
(29). 
Beds overlying Carboniferous Limestone, Bishopstown, Glamorgan; 
n. sp. Trilobita ; Woodward (29). 
Carboniferous, Dobsina, Hungary, n. sp. Trilobita ; Illes (10). 
Upper Coal Measures, Missouri and Kansas, n. spp. Cyclus ; Rogers 
(24). 
Lower Devonian of Western Sahara, Trilobita; Flam and (5). 
Devonian, Marcellus Limestones of New York State, Trilobites ; Clarke 
(4), Wood (27). 
Silurian, S.W. Scotland, Trilobita ; Peach (19). Xiphosura and Eury- 
pterida , Peach (20). 
Ordovician, Trenton Limestone, Albany N. Y., Trilobites, n. spp.; 
Ruedemann (26). 
Cambrian, Dictyonema- Shales, Malvern Hills, n. g. and sp. Trilobita ; 
Groom (9). 
Cambrian of China, Trilobites, n. spp. ; Airaghi (1). 
Middle Cambrian, Mt Stephen, British Columbia, 6580 feet altitude, 
Trilobites; Woodward (28). 
IV. SYSTEMATIC. 
Series Chelicerata. 
i. Class Merostomata. 
'Sub-class Gigantostraca. 
Order Haplochelata nov. 
Sub-class Xiphosura. 
Order, Polychelata nov. 
ii. Class Arachnida [see Record of Arachnida \; 
Borner, Zool. Anz. xxv, p 465. 
XIPHOSURCE. 
Nomenclature, p. 256, classification, p. 260; Pocock, Ann. Nat. Hist. (7) ix. 
Entosternite, p. 226; Pocock, Quart. J. Micr. Sci. (n. s.) xlvi. 
tXiphosurse fossil in Scotland; Peach, P. Phys. Soc. Edinb. xiv (4), p. 373. 
Carcinoscorpius n. g. rotundicauda , p. 265, pis v, fig. b, vi, figg. 3 & 5 ; 
Pocock, Ann. Nat. Hist. (7) ix. 
t Prolimulus woodwardi , p. 64, pi. 155, figg. 1—3, text-figg. 369 & 370, 
Permian, Bohemia; Fritsch, Fauna der Gaskohle iv (2 & 3), n. sp. 
Tachypleince nov. def., p. 261; Pocock, Ann. Nat. Hist. (7) ix. 
Tachypleus, g. def., p. 262, key to spp., p. 264, gigas, p. 262, pis v, fig. c, 
vi, figg. 1, 4 & 6, tridentatus, p. 263, pis v, fig. e, vi, fig. 2; Pocock, 
Ann. Nat. Hist. (7) ix. 
T. hoeveni , Moluccas, p. 264, pi. v, fig. d; Pocock, Ann. Nat. Hist. (7) ix, 
n. sp. 
Xiphosura (= Limulus), g. def., p. 260 , polyphemus, p. 261, pis v, fig. a, vi, 
fig. 7; Pocock, Ann. Nat. Hist. (7) ix. 
Xiphosura , g., authority for name, p. 196; Rathbun, P. Soc. Washington xv. 
Xiphosurince , nov. def., p. 260; Pocock, Ann. Nat. Hist. (7) ix. 
