144 P.N. WYSE JACKSON 
Figs 51-57 Rhombocladia dichotoma (M‘Coy, 1844) comb. nov.; 51-56, Upper part of the Glencar Limestone (Viséan, Asbian), Carrick Lough, County 
Fermanagh; 51, BMNH PD9591; 51a, obverse surface details of a growing tip; autozooecia are arranged in eight longitudinal and obliquely intersecting 
rows; autozooecial apertures are rhombic in shape, x40; 51b, detail of autozooecial apertures together with that of the hemiseptum developed from 
proximal walls; note the position of a single acanthostyle distal of autozooecia, x150; 52, BMNH PD9592, obverse surface of a branch with 11—12 rows 
of autozooecia, x20; 53, BMNH PD9593, reverse surface detail showing characteristic semi-circular pattern of basal laminae, x40; 54, BMNH PD9593, 
broken zoarial fragment showng typical cross-section shape of branches, x80; 55, BMNH PD9618, longitudinal section showing autozooecial chamber | 
shape, thin chamber walls, and long hemisepta, x50; 56, BMNH PD9614, shallow tangential section showing longitudinal arrangement of autozooecia, 
with cross-cut hemisepta, and heterostyles developed on interapertural walls, x40; 57, NMI.F6030, (lectotype), Carboniferous Limestone, Dinantian 
(Viséan); locality uncertain; Griffith Collection, reverse surface of branched zoarium showing characteristic semi-circular pattern of basal laminae, and | 
longitudinal lines where autozooecial walls meet basal wall; figured by M‘Coy, 1844, pl. 27, fig. 15 as Vincularia dichotoma; x2. 
Rhombocladia dichotoma (M ‘Coy, 1844) comb. nov. fig. 15. NMING:F7056-F7057, F7059-F7060; Black Lion, ne 
Figs 42c, 51-58 Enniskillen, County Cavan (Viséan, Asbian); Griffith Collectior 
NMING:F7061; Millicent, Clane, County Kildare (Viséan, Chadian 
Griffith Collection. NMING:F7486-F7489; Kildare, County Kij 
dare (Viséan); Griffith Collection. SMC:E5188; Howth, Coun 
Dublin (Courceyan/Chadian, Dinantian); Griffith Collectioy 
SMC:E5189/a-b; Killymeal, Dungannon, County Tyrone (Viséa 
Brigantian); Griffith Collection. SMC:E5190; Kildare, County Ki 
dare (Viséan); Griffith Collection. 
LecToryPE. NMING:F7058, here designated; Black Lion, near fareRIAL. BMNH D2564; ?Ireland (?Carboniferous); Shrubso| c 
Enniskillen, County Cavan (Viséan, Asbian); Griffith Collection. Collection. BMNH PD9591-9620: TCD.34053-34064, 3415} 
PARALECTOTYPES. NMING:F6030, here designated; no locality 34164, 34167, 42563a, b, 42565-42567, 42594, 42604c, 42606) 
given (?Viséan); Griffith Collection; figured M*Coy 1844, pl. 27, 42609; BELUM K2159, Upper part of the Glencar Limestot) 
v 1844 Vincularia dichotoma M‘Coy: 198, pl. 27, fig. 15. 
non1850_ -Vincularia dichotoma @ Orbigny, p. 195, pl. 682, figs 7— 
} 
1854b Vincularia dichotoma M‘Coy; M‘Coy: 104. 
1857 Vincularia dichotoma M‘Coy; Jukes: 454. 
1862  Vincularia dichotoma M ‘Coy; Griffith: 198, 235. 
