The Quarterly journal of the Geological Society of London . imitive Morphasmopora showingthese characters. In Morphasmopora Jukes-brownei (tig. 11, p. 216)one pair of avicularia has been lost, and the single proximally-directed pair is not so highly raised on the apertural rim. Thisspecies is also catagenetic in the number of costa?, possessing tenonly, whereas in M. hrydonei they had increased to twelve fromthe original ten of the Primitive Kelestomine. Fig. 8.—Diagram of Kelestoma gradatum. sp. nor. x about 133 diameters. Lacuna in interceeial secondary shield of secondary aper
The Quarterly journal of the Geological Society of London . imitive Morphasmopora showingthese characters. In Morphasmopora Jukes-brownei (tig. 11, p. 216)one pair of avicularia has been lost, and the single proximally-directed pair is not so highly raised on the apertural rim. Thisspecies is also catagenetic in the number of costa?, possessing tenonly, whereas in M. hrydonei they had increased to twelve fromthe original ten of the Primitive Kelestomine. Fig. 8.—Diagram of Kelestoma gradatum. sp. nor. x about 133 diameters. Lacuna in interceeial secondary shield of secondary aperture. Secondary aperture. Avicularium. Lacuna in secondary tissue. Broken end of proximal apertural spine Fusion oi proximal apertural spine withdistal forks of apertural bar. Proximal apertural spine. Slot-like gap between proximal apertu-ral spine and distal fork of apertural Distal fork of apertural bar. [bar. Proximal fork of apertural area of fusion. Interceeial secondary tissue. Lacuna in interceeial secondary Fig. 9.—Diagram of the distal end of the cerium of a hypothe-tical Primitive Morphasmopora. Very much enlarged.
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
