Collins (1973), in a major systematic study of the Upper Cretaceous cirripeds of the eastern Gulf Coast, described four species of Cretiscalpellum, four of Arcoscalpellum, one of Virgiscalpellum (with two subspecies), and one of Brachylepas. In a companion paper, Mellen (1973) analyzed the stratigraphic and geographic distribution of these species and established the following biostratigraphic zones (Figure 1):

Presence of palynomorph assemblages that display exquisite preservation in evaporite deposits makes them invaluable as age indicators, as often no other fossils are present. However, such use of palynomorphs has been extremely limited because of complications in extraction from the surrounding rock material. Palynomorphs found in evaporites frequently cannot be removed by conventional uses of hydrofluoric and hydrochloric acids, or by modifications of these techniques (Sittler, 1955; Freudenthal, 1964; and Visscher, 1966), as neither acid is capable of removing significant quantities of sulfate minerals. Inadequate removal of these minerals prevents a good concentration of spores and pollen and hinders the preparation of useful microscope slide mounts.

In the recent paper on Mississippian and Pennsylvanian polyplacophorans (Hoare and Mapes, 1985) the proposed new genus Euleptochiton was inadvertently assigned to the family Ochmazochitonidae Hoare and Smith, 1984, instead of the family Permochitonidae Sirenko and Starobogatov, 1977. In the same paper the estimated size of Colapterochiton decorus should read 5.5 cm.

In revising the subgenus Mclearnia Crickmay (1930), Kelly, Dhondt and Zakharov (1984) recommended that the spelling of the subgenus and species should be emended to Maclearnia maclearni. The latter authors had followed Recommendation III 21(a) of the International Code of Zoological Nomenclature (Stoll, 1964, p. 109), but this recommendation should be followed only in the formation of new names and not in revision of old names. Thus the emended name Maclearnia maclearni is unjustified and falls into the category of Article 33(ii) of the Code (Stoll, 1964, p. 37), becoming automatically a junior objective synonym of Mclearnia mclearni. The full revised name thus becomes Camptonectes (Mclearnia) mclearni (Crickmay, 1930).