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| 1 | Smallest specimen observed. Shows broad short carapace; broad preabdomen; large eyes; swimming legs; abdomen with apparently but eight segments and short telson. Paratype. × 6. (length 5.5mm) |
| 2 | Somewhat older individual, having 12 segments, but still retaining the broad carapace and preabdomen. Paratype. × 5. (length 8mm) |
| 3 | Carapace of young individual, showing the great width of carapace, the large lateral eyes with ocular node and visual area and prominent ocellar tumescence. × 18. (length 1.8mm) |
| 4 | Carapace and first tergite of somewhat older individual, still showing large prominent lateral eyes. × 6 |
| 5 | Young carapace with a swimming leg. Eyes show ocular node and visual area. × 12 |
| 6 | A larger carapace with smaller eyes, retaining both the ocular node and visual area. × 3 |
| 7 | Another carapace, showing the crescentlike form of the visual area. Paratype. × 3 |
| 8 | Very young individual, retaining carapace and preabdomen; with slight lateral compression. Shows rim and very prominent lateral eyes and ocellar mound or tumescence. × 5 |
| 9 | Another young individual, retaining more nearly the original form and strong traces of ornamentation on tergites. Paratype. × 5½. (length 8mm) |
| 10 | An older carapace retaining the large sized lateral eyes of the immature condition. × 3. (length 7.9mm) |
| 11 | A young individual showing the carapace with the swimming leg and eight segments |
| 12 | The type specimen; a probably mature individual. Natural size |
All originals are from the Shawangunk grit, Otisville, Orange co., N. Y., and are in the State Museum
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