Nautilus (Argonaut Shell), Northwood/Dugan
The Nautilus pattern predated the Carnival era and has been called Argonaut Shell. Northwood produced an extensive line in custard and opalescent glass--some molds have the early "Northwood" in script. The molds were transferred to Dugan who produced the few limited shapes in carnival. Apparently Dugan did not immediately remove the mark, which is why some pieces are found with the Northwood script. The pieces above are both made from the same mold--the gravy or creamer on the left has one edge pulled up, the sugar on the right two opposite edges pulled up.

Hartung Book Four: Nautilus

Creamer/gravy whimsies

Peach opal, 20, 25, 30, 50 (all 2019),
   45, 50, 75 (all 2021)

Peach opal, souvenir Lisbon NY, 95 (2005)

Purple, 20, 25, 50 (all 2020), 50, 70 (both 2021)

Purple, signed Northwood in script, 650 (2020)
Sugar bowl whimsies

Peach opal, 45 (2021), 10 (2022)

Purple, 60, 115 (both 2020), 275 (2022)
Vases were made from a tumbler mold, though no tumblers have been found in carnival. The vases range in height from 6 inches to about 9 inches and marigold is more scarce than purple. On the right is a whimsey piece made from the creamer/sugar mold. This peach opal example, stretched to 7½ inches wide, sold for $175 in 1995. A similar item sold in 2020 for $180. A purple whimsey bowl with two sides pulled up sold for $260 in 1996.
Vases, 7 to 9 inch

Blue, base chip, 55 (2020)

Marigold, 70, 190 (both 2020), 95 (2021)

Purple, 125, 150 (2021), 675 (2022)

Purple, 6 1/2-inch, 225 (2015), 120 (2022)

This unusual banana boat was made from a completely different mold than the creamers/sugars and is considerably larger. Note that the base is oval shaped. Courtesy of Larry and Mary Yung.
When this marigold piece sold in 2022, it was listed as the only Nautilus bowl known in any color. No size was given. It brought $1,300. Photo courtesy of Wroda auctions.

When this blue Nautilus toothpick holder sold in 2022, it was the first I'd heard of the shape in this pattern. It brought $25. Another in blue sold the same year for $10. Also in 2022, a water pitcher and tumbler in white opal sold for $55.

Updated 11/15/2022