. Bulletin. Science. 1mm n â â â â tM ' i + * 1 & -* 1mm' <?§ Fig. 1. Heterochone incognitus specimen SIO P 592. A, presumed lower (right) and upper (left) surfaces of the lobate fragment, with bases of two funnels indicated by asterisks and intact portion of funnel wall indicated by arrowheads. B, dermal surface with intact pinule lattice covering entire surface, including entrances to diarhysial channels. C, atrial surface with open, uncovered apertures of diarhysial channels. Remarks.âUpon his erection of Heterochone, Ijima (1927) provided an exten- sive comparison of the new genus
. Bulletin. Science. 1mm n â â â â tM ' i + * 1 & -* 1mm' <?§ Fig. 1. Heterochone incognitus specimen SIO P 592. A, presumed lower (right) and upper (left) surfaces of the lobate fragment, with bases of two funnels indicated by asterisks and intact portion of funnel wall indicated by arrowheads. B, dermal surface with intact pinule lattice covering entire surface, including entrances to diarhysial channels. C, atrial surface with open, uncovered apertures of diarhysial channels. Remarks.âUpon his erection of Heterochone, Ijima (1927) provided an exten- sive comparison of the new genus with its only sister genus, Aphrocallistes, but did not provide a diagnosis. Reid (1963), aware of Ijima's action, characterized the genus by body form, a strategy perhaps necessary for paleontological use but insufficient for zoological application. Koltun (1967) was apparently unaware of Ijima's formation of Heterochone, perhaps because it was mistakenly omitted from the final list of Ijima's (1927) publication (Reiswig 1990). The short, new diagnosis provided here differentiates Heterochone (with hexactine atrialia) from Aphrocallistes (with diactine atrialia).. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectscience
