. Bulletin of the British Museum (Natural History), Geology. ig. 39 Pleurophorella striatolamellosa (de Koninck). Lower Carbon- iferous, Visean, Stebden Hill, Yorkshire; BM L47510; Fig. 39a, left valve; Fig. 39b, dorsal view; Fig. 39c, anterior view; all X1-25. 'leurophorellu sp. Fig. 40 Iaterial. USNM 515g, two specimens from the Lower iraham Formation, Upper Pennsylvanian, 0-5 miles north of .'exas 24, 6-5 miles west of Jacksboro, Texas. Description. Shell ornament consisting of concave-upwards, larp, comarginal ribs with intervening fine growth laminae. \o surface pustules are preserved. Ca
. Bulletin of the British Museum (Natural History), Geology. ig. 39 Pleurophorella striatolamellosa (de Koninck). Lower Carbon- iferous, Visean, Stebden Hill, Yorkshire; BM L47510; Fig. 39a, left valve; Fig. 39b, dorsal view; Fig. 39c, anterior view; all X1-25. 'leurophorellu sp. Fig. 40 Iaterial. USNM 515g, two specimens from the Lower iraham Formation, Upper Pennsylvanian, 0-5 miles north of .'exas 24, 6-5 miles west of Jacksboro, Texas. Description. Shell ornament consisting of concave-upwards, larp, comarginal ribs with intervening fine growth laminae. \o surface pustules are preserved. Carinate lunule and scutcheon present. The carina bounding the escutcheon is 87 crenulate with prominent backward-pointing growth lines. The hinge of the right valve is particularly well preserved (Fig. 40); there is a small anterior tooth, parallel to the anterior dorsal margin, and a thin posterior tooth running parallel to and below the ligament nymph. The nymph is moderately long. It is not well preserved at its proximal end, where there may have been an attachment of the outer anterior ligament. The ligament groove is well preserved, and the ligament is present at the distal end; more proximally the upper surface of the nymph is transversely striate where part of the inner ligament layer has broken away. Growth laminae are visible on the inner surface of the nymph just below the attachment area of the inner Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
Size: 2014px × 1241px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
