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| 1 | Young individual. Original of Hall's figure [Palaeontology of N. Y., v. 3, pl. 81, fig. 1] × 2. Shows well the outline of the carapace and the relatively large size of the compound eyes in the young. The preabdominal segments are shoved together, and the preabdomen appears therefore too short and wide and too abruptly contracted. The apparent posterior edges are partly fracture lines. The outline drawing of the specimen, inserted in the text, shows this condition more distinctly. |
| 2 | Ventral side of a specimen, showing the five sternites with their median sutures. The first four retain a certain amount of uniform convexity, the fourth is pushed inward and much arched, the fifth flattened and shows the relatively great length of these segments. The genital appendages of the first (opercular) and second sternites are broken out, leaving a cleft. Natural size |
| 3 | Operculum, original of Hall's figure, op. cit. pl. 81, fig. 8 [see diagram, text fig. 122]. The pentagonal pieces in front of the opercular appendage are seen. The principal median appendage is broken at b, its original extension indicated by an impressed line at с The paired tubular
 Text fig. 122 Diagram to pl. 11, fig. 3 appendages are recognized in outline at a, and the aperture seen at h. The posterior (e) and lateral (d) doublures, as well as fragments of the anterior connecting membrane, are also shown. Natural size |
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