JURASSIC BRYOZOANS FROM BALTOW, POLAND 
1] 
Figs 9-12 Hyporosopora baltovensis sp. nov., Oxfordian, Balt6w, Poland. Scanning electron micrographs of uncoated specimens. 9-10, MUZ PIG 1601/ 
II/13; 9, lamellar colony, x 18; 10, transverse ridges and autozooids, some with terminal diaphragms, x 64. 11-12, MUZ PIG 1601/II/3, holotype; 11, 
gonozooid, x 65; 12, ooeciopore (triangular hole beneath is a breakage in the gonozooid frontal wall), x 225. 
Hyporosopora baltovensis sp. nov. Figs 9-18 
HOLOTYPE. 
MUZ PIG 1601/II/3 (Figs 11-12). 
Paratypes. MUZ PIG 1601/II/4 and 5, 13-18. 
AME. After Baltow, the type locality. 
DESCRIPTION. Colony multiserial, sheet-like, bereniciform, com- 
only unilamellar but occasionally multilamellar, either planar 
Fig. 9) or tubular (Figs 13-18) in shape. Tubular colonies possess a 
istinct suture formed by coalescence of lobes of the growing edge 
Qn opposite sides of the colony (Fig. 15). Distal fringe of basal 
amina protrudes beyond budding zone at growing edge (Fig. 14) 
where two or three generations of zooidal buds, some with mural 
ustules, are visible. Colony surface ornamented by discontinuous 
eeimerse ridges, irregularly-spaced 0.02—0.08 mm apart, of low 
orofile and sometimes indistinct, deflected proximally where they 
meet apertures (Fig. 10); ridges absent over dilated frontal walls of 
gonozooids (Fig. 11). Original substrates of encrustation not pre- 
served. 
Autozooids (Fig. 10) small, immersed, their frontal walls without 
well-defined boundaries, short, 0.25—0.50 mm in length by 0.11— 
0.17 mm in width. Apertures small, usually longitudinally elongate 
but sometimes transversely elongate or circular (especially near the 
edge of colonies), 0.08-0.17 mm long by 0.06-0.14 mm wide, 
arranged roughly in quincunx, closely-spaced and often crowded 
close to the colony perimeter where they are larger in diameter. 
Terminal diaphragms sporadic in distribution, positioned level with 
or a little beneath the frontal wall (Fig. 10), and also observed 
occluding immature buds at the growing edge (Fig. 13). Preserved 
peristomes moderately long, tapering distally. Pseudopores approxi- 
mately circular in shape, widely spaced, absent on transverse ridges. 
Gonozooids (Fig. 11) subcircular to subtriangular in outline, 
wider than long, averaging 0.60 mm in length by 0.90 mm in width, 
