SUB-ORDER B TREPOSTOMATA Drie 
Family 6. Batostomellidae. Ulrich. 
Zoaria usually ramose, occasionally sub-lobate, massive, laminar, or parasitic, often 
consisting of superimposed layers. Zowcia with thick walls in the mature region, usually 
appearing here as fused. 
Diaphragms horizontal, 
those in peripheral region 
with central perforation. 
Acanthopores and meso- 
pores usually present ; the 
latter small, often «nter- 
mittent. Ordovician to 
Permian. 

Bythopora, Miller 
and Dyer. Small Fic. 463. 
5 Batostomella spinulosa, Ulr. Chester Group; Kentucky. A, B, Vertical 
branching stems. Aper- sections, one with and the other without diaphragms, 14/,, C, Tangential 
tures oblique, attenuate section, 4/). D, Surface, 14/;. On either side of C are branches of the natural 
size (after Ulrich). 
above. Interspaces 
canaliculate, with an occasional mesopore or none. Ordovician. 
Callotrypa, Hall; Silurian. Lridotrypa, Ulrich ; Ordovician to Devonian. 
Batostomella, Ulrich (Geinit- 
zella, W. and W.; Trematella, 
Hall), (Fig. 463). Slender 
branches, without monticules. 
Apertures small, circular, or oval. 
Interspaces rounded or canal- 
iculate, spinulose, the acantho- 
pores small and usually very 
numerous. Mesopores small, 
sub-circular. Diaphragms few. 
payer Devonian to Permian. 
Stenopora americana, Ulr. Keokuk Group; Illinois. Vertical Stenopora, Lonsd. (Fig. 464). 
(4) and tangential (6) sections showing moniliform walls and per- Zoaria ramose,sub-lobate, massive, 
forated diaphragms, 14/; (after Ulrich). leas aa rive 
aminar, or parasitic. e 
even or montiferous. Zocecial walls periodically thickened in the mature region. 
Largeacanthopores at many 
of the angles between the 
zocecia. Mesopores never 
very numerous, irregularly 
distributed. Diaphragms 
sometimes very scarce, but 
in most American species 
abundant in the peripheral 
region, and with a large 
central perforation. Sub- 
Carboniferous to Coal 
Measures. Fic. 465. 
Anisotrypa, Ulrich. I Lioclema foliata, Ulr. Keokuk Group ; See A, Weruloat section, 
Divisional line between ad- Bie Cee section, 1/;. C, Portion of wall and acanthopore, %8/; 
joining tubes more sharply 
defined, and periodic swellings of the walls much less distinct than in Stenopora. Acan- 
thopores and mesopores absent ; perforated diaphragms numerous. Sub-Carboniferous. 
? Lioclema, Ulrich (Fig. 465). Ordovician to Sub-Carboniferous. 


