. Bulletin of the British Museum (Natural History), Geology. . 63 64 65 Figs 63-65 £7<?a labyrinthica (Michelin, 1843). 63, 64, BGS GSM Rh 4582, Cenomanian Limestone, ?Bed Al, Hall Rocks to Beer Head, Devon, England; 63, large eleozooid with slightly damaged operculum, x 145; 64, two large eleozooids housing small intramural eleozooids, x 110. 65, VH 10460, Cenomanian, Cap de la Heve, Seine Maritime, France, gonozooid with crushed frontal wall, x 35. specimens), same horizon and locality as holotype. Name. In recognition of the numerous fundamental contri- butions made to bryozoology by Dr
. Bulletin of the British Museum (Natural History), Geology. . 63 64 65 Figs 63-65 £7<?a labyrinthica (Michelin, 1843). 63, 64, BGS GSM Rh 4582, Cenomanian Limestone, ?Bed Al, Hall Rocks to Beer Head, Devon, England; 63, large eleozooid with slightly damaged operculum, x 145; 64, two large eleozooids housing small intramural eleozooids, x 110. 65, VH 10460, Cenomanian, Cap de la Heve, Seine Maritime, France, gonozooid with crushed frontal wall, x 35. specimens), same horizon and locality as holotype. Name. In recognition of the numerous fundamental contri- butions made to bryozoology by Dr McKinney (Appala- chian State University). Description. Colony bifoliate with branches (Fig. 66) nar- row, strap-like, about 1-8 mm wide between bifurcations, and 0-7 mm deep. Autozooids generally arranged in transverse rows whose regularity is disrupted close to bifurcations; organization fixed-walled. Overgrowths and colony base not observed. Autozooids (Fig. 67) medium-sized, with elongate hexago- nal frontal walls on average slightly less than 2 x longer than wide; pseudopores circular or longitudinally elliptical; zoo- ecial boundaries raised. Apertures small, longitudinally elon- gate, about 1-1 x longer than wide, attaining maximum width a little proximally to mid-length, appreciably narrower at hinge line level; apertural shelf absent or at most very slightly developed; apertural rim moderately raised; hinge line straight or slightly bowed, typically concave in eroded zooids lacking opercula. Opercula (Fig. 69) rarely preserved in-situ, flat or slightly depressed, bearing about 16 pseudopores arranged in a crescent parallel to the distal/ lateral margin. Terminal diaphragms not observed. Intramu- rally budded autozooids represented by a single example with a slightly oblique aperture (Fig. 70). Eleozooids (Figs 67, 68) common, located along branch margins, on average about 3 x longer than wide, usually occupying two transverse rows of autozooids. Aperture long, wi
Size: 1062px × 2355px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
