. Bulletin of the British Museum (Natural History), Geology. 34 E. F. OWEN. Fig. 18 Scatter diagram showing relationship of length to thickness in specimens of Bouchardia antarctica S. S. Buckman; same material and symbols as in Fig. 17. The scatter diagrams clearly indicate a single species for the five taxa erected by Buckman (1910) and for the species represented by specimens collected by the IPS. These forms are here assigned to Bouchardia antarctica S. S. Buckman. Ihering (1897 : 268) described Bouchardia zitteli from the Tertiary of Patagonia. He figured a specimen (1897 : fig. 6) which,
. Bulletin of the British Museum (Natural History), Geology. 34 E. F. OWEN. Fig. 18 Scatter diagram showing relationship of length to thickness in specimens of Bouchardia antarctica S. S. Buckman; same material and symbols as in Fig. 17. The scatter diagrams clearly indicate a single species for the five taxa erected by Buckman (1910) and for the species represented by specimens collected by the IPS. These forms are here assigned to Bouchardia antarctica S. S. Buckman. Ihering (1897 : 268) described Bouchardia zitteli from the Tertiary of Patagonia. He figured a specimen (1897 : fig. 6) which, although similar in general outline to B. antarctica Buckman, differs in having fewer and more pronounced concentric growth-lines and also in its faint carina- tion of the anterior part of the dorsal valve. B. zitteli was again cited by Ihering (1903 : 334) and a specimen figured (1903 : pi. 3, fig. 9), together with a specimen of Bouchardia patagonica (1903 : pi. 3, fig. 10) which he had described from the Palaeocene of St Jorge Gulf, Pico, Sala- manca, Chile. An error in the numbering of the specimens figured on the plate has caused con- fusion over the identification of these species. The numbers have in fact been transposed. Levy (1964 : 213) drew attention to this error when describing specimens of B. patagonica from the type locality. In the same publication Levy (1964) also described and figured examples of Bouchardia zitteli Ihering (unfortunately misspelled as B. zittelli) from the Lower Tertiary of Santa Cruz, Argen- tina. She figured four examples (1964 : pi. 1, figs 3, 4) showing a fair range of variation in outline. 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: 1364px × 1832px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbritishmuseumnaturalhistory, bookcentury1900, bookcoll
