122 
DERGVONE SHALE 
CARRAUN SHALE 
BELLAVALLY FMN 
GLENADE SANDSTONE 
MEENEYMORE FMN 
DARTRY LIMESTONE 
(including reef facies) 
BRIGANTIAN 
GLENCAR LIMESTONE 
BENBULBEN SHALE 
HOLKERIAN 
MULLAGHMORE 
SANDSTONE 
BUNDORAN SHALE 
(UPPER) 
DOWRA SANDSTONE 
BUNDORAN SHALE 
(LOWER) 
BALLYSHANNON 
LIMESTONE 
CHADIAN 
COURCEY AN BASAL CLASTICS 
LIMESTONES 
SHALES 
SANDSTONES 
Fe=9>1 COARSE CLASTICS 
Fig. 2 Stratigraphical succession in west County Fermanagh. Bryozoan 
horizon at the top of the Glencar Limestone arrowed. 
SYSTEMATIC PALAEONTOLOGY 
During the course of this study three cases of misidentification of 
taxa in earlier described collections came to light. All cases have a 
bearing on the systematics of the Asbian bryozoan fauna described 
below. The first two cases of misidentification were those of 
P.N. WYSE JACKSON | 
M‘Coy (1844) who identified two Lower Carboniferous bryozoans | 
as being conspecific with two Devonian taxa (Millepora gracilis | 
and Millepora similis) described three years earlier by Phillips 
(1841). The Carboniferous taxa have been redescribed and named, 
below and elsewhere (Wyse Jackson & Bancroft, 1995a) as | 
Rhombopora cylindrica sp. nov. and Rhabdomeson progracile re- 
spectively. Millepora gracilis as originally described by Phillips 
(1841) contains specimens herein considered to belong to two \ 
genera — Rhabdomeson and Rhombopora. The third case of 
misidentification is that of Owen (1966). Rhombopora radialis ) 
Owen, 1966 is synonomised with Pseudonematopora turkestanica © 
(Nikiforova, 1948). More detailed discussion of the contrasting | 
} 
taxa is given in the discussion section of Pseudonematopora 
planatus sp. nov. and Rhombopora cylindrica sp. nov., and in Wyse 
Jackson & Bancroft (1995a) 
For completeness brief descriptions are given of the following = 
taxa which have been described more fully elsewhere: Rhabdo- - 
meson progracile Wyse Jackson & Bancroft 1995, Rhabdomeson | 
rhombiferum (Phillips, 1841), Baculopora megastoma (M‘Coy, | 
1844), Diploporaria tenella Wyse Jackson, 1988, Thamniscus } 
colei Wyse Jackson, 1988, and Fistulipora incrustans (Phillips, _ 
1836). 
Phylum BRYOZOA Ehrenberg, 1831 
Class STENOLAEMATA Borg, 1926 
Order CRYPTOSTOMATA Vine, 1884a | 
Suborder RHABDOMESINA Astrova & Morozova, 1956 | 
Family ARTHROSTYLIDAE Ulrich, 1882 
Genus HEXITES Shulga-Nesterenko, 1955 
TYPE SPECIES. Hexites triangularis Shulga-Nesterenko, 1955 by 
monotypy from the Lower Carboniferous of Chekhurskiv in the 
Russian Platform. 
EMENDED DIAGNOSIS. Arthrostylid with dendroid, erect zoaria | 
composed of small delicate branches, with polygonal cross-sec- 
tions. Perpendicular lateral branches occasionally developed. Jointing 
unknown. Autozooecial apertures oval to elliptical in shape, ar 
ranged in five to eight longitudinal rows and separated by a distinct) 
ridge. Autozooecial chambers triangular to sub-triangular in cross-) 
section. Zooecia seven to ten times longer than wide, diverging atal}) 
low angle with slightly inflated bases and sublinear chambers.) 
Hemisepta and diaphragms not present. Small acanthostyles fre-\) 
quently developed on ridges. 
DISCUSSION. The genus Hexites Shulga-Nesterenko 1955 was 
erected for distinctive small dendroid six-sided arthrostylids. Late 
Dunaeva (1974: 93) included the eight-sided variety Hexites 
quadrangularis. The taxon from County Fermanagh described here 
has very similar morphological features to that of Hexites triangula\) 
ris but differs from it in that as many as eight longitudinal rows ma} | 
be developed. It might be acceptable to erect a new genus tt} 
incorporate H. quadrangularis and the Irish form but is probably}. 
taxonomically unnecessary; rather the diagnosis of Hexites has beet} 
emended here to include all three taxa. 
STRATIGRAPHICAL RANGE. Lower Carboniferous (Viséan). 
DISTRIBUTION. 
Soviet Union). 
Only known from Ireland and the CIS (forme 
