470 Dr. H. Woodward — Carboniferous Arthropods. 



their relationship with the Eurypteridse " : Quart. Journ. Geol. Soc, 

 vol. xxiii, pis. i and ii, p. 32, 1867 ; and again, in. my Monograph on the 

 Order Merostomata, Pal. ISoc, pt. v, 1878, sub-order Xiphosura, 

 pp. 236-48, I discussed the arrangement of the several genera of 

 these Palaeozoic forms of Arthropoda and proposed to divide the 

 Coal-measure species into two genera : — 



(A) Those having movable thoracic segments and anchylosed 

 abdominal ones, under the genus Bellirmrus (with 8 species, 1918). 



(B) Those in. which all the post-cephalic segments are coalesced 

 under the genus PreshvicJiia. The name being preoccupied, it has 

 now been found necessary to subdivide this latter group into two 

 genera, namely: (1) PrestivichianeUa, with 1 species; (2) Ewproops, 

 with 6 species. 



In Section A, BeUinurus, Konig, the earliest records of this genus 

 in which intelligible figures are given are : by Mr. Charles K:onig, 

 Keeper of Geology and Minerals in the British Museum in 1820 

 (Icones Poss. Sect., pi. xviii, fig. 230), and later, in 1836, by 

 Buckland, in his Bridgewater Treatise, i, p. 396 ; ii, p. 77, pi. xlv, 

 fig. 3 ; Mr. Prestwich, in 1840, Trans. Geol. Soc, ser. n, vol. v, 

 p. 491, pi. xli, fig. 8; H. Woodward, 1866, Trans. Glasgow Geol. 

 Soc, p. 247, pi. iii, fig. 10, and Pal. Soc. Mon., Merostomata 

 (Xiphosura), pt. v, 1878, p. 236, pi. xxxi, figs. 3a, h, c, and 4. 



Genus Bellinurtis, Konig, 1820. 

 The species included under this genus are : — 

 BeUinurus bellulus, Konig, 1820, Icones Foss. Sect. 

 B. arcuatus, Baily, Ann. Mag. Nat. Hist., ser. Ill, vol. xi, p. 112, 1863. 

 B. regincB, Baily, Ann. Mag. Nat. Hist., ser. Ill, vol. xi, p. 107, pi. v, 1863. 

 B. kiltorkensis, J^aily, Brit. Assoc. Rep., p. 75, 1869. 

 B. Kmnigianus, H. Woodw., Geol. Mag., p. 439, PI. X, Fig. 8, 1872. 

 B. grandcBV7is, Jones & Woodw., Geol,. Mag., 1899. 

 B. lunatus, Parker, Lancashire Naturalist, 1907, p. 44. 

 B. Baldwini, H. Woodw., Geol. Mag., 1907, p. 540, Fig. 1. 

 B. longicaudatus, H. Woodw., Geol. Mag., 1907, p. 541, Fig. 2. 



Bellinueus Trechmanni, H. Woodw., sp. nov. 

 SpecifiG Characters. — Head-shield semicircular, being 9 mm. in 

 breadth and 4 mm. in length, the genal spines moderately long, 

 2Jmm. in length, directed outwards (the extremity is only preserved 

 on one side) ; breadth of glabella 2Jmm., the length is not easily 

 determined but probably about two-thirds that of the head-shield, 

 and there is a faint trace of the arched axis. The frontal border of 

 the head-shield is distinctly marked and the centre is roundly 

 elevated; the eyes are not distinct; the posterior border between 

 the spines is fairly straight and measures 7^ mm. The axis of the 

 thoracetron agrees with that of the glabella in breadth (viz. 2|^mm.), 

 only very slightly diminishing towards the telson ; its length is 

 4 mm. There are six free post-cephalic segments, which are markedly 

 trilobed, directed slightly backwards, ending along the lateral margin 

 in stout recurved spines; the pleurae of these free segments diminish 

 rapidly towards the extremity of the thoracetron. There is a small 

 coalesced abdominal portion bearing a tubercle above the insertion 



