. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 87. MAXIMUM WHORL HEIGHT IN MM Fig. 53. Baculires capensis Woods, 1906. Histogram illustrating distribution of maximum whorl height. Solid circles represent specimens with the aperture preserved. Note the absence of a sharp break between apparent macro- and microconchs suggesting, perhaps, a uniform variable range of maturation sizes. Matsumoto & Obata (1963: 43, pi. 13 (figs 3, 5), pi. 15 (fig. 6), text- figs 93, 152-155) subsequently described B. boulei from
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CRETACEOUS FAUNAS FROM SOUTH AFRICA 87. MAXIMUM WHORL HEIGHT IN MM Fig. 53. Baculires capensis Woods, 1906. Histogram illustrating distribution of maximum whorl height. Solid circles represent specimens with the aperture preserved. Note the absence of a sharp break between apparent macro- and microconchs suggesting, perhaps, a uniform variable range of maturation sizes. Matsumoto & Obata (1963: 43, pi. 13 (figs 3, 5), pi. 15 (fig. 6), text- figs 93, 152-155) subsequently described B. boulei from Hokkaido, where it is partly coeval with both B. capensis and B. schencki, Coniacian and San- tonian (Matsumoto & Obata, text-fig. 216). Kennedy (1986^: 112) regarded B. boulei as having a stouter whorl section than B. capensis and more closely spaced tubercles, which lie nearer to the dorsum than in the latter species. Baculites schencki Matsumoto (1959: 113, pi. 32 (figs la-c, 2a-c, 3a-b, 4a-b, 5a-c, 6a-c), text-figs 12a-b, 13a-c, 14a-b, 15-21, 22a-b, 24-25) typi- cally has an ovoid whorl section, and closely spaced, crescentic lateral nodes. It diff"ers in typical forms from B. boulei by the weaker lateral ornament, and the narrower venter, but intermediate forms occur. This is very similar to, or ident- ical with what we regard as form 2 of early B. capensis. According to Matsumoto (1959: 120), the stratigraphic ranges of the two species overlap in California: B. schencki is more common in the lower part (of Member IV and V of the Redding area), whereas B. boulei is relatively common in the upper part. In comparing B. boulei and B. schencki with B. capensis, Matsumoto (1959: 125) remarked that in California 'the three species, B. schencki, B. boulei and B. capensis are nearly contemporary, but their stratigraphic positions of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colora
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
