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| 4 |  Text fig. 123 Diagram to pl. 11, fig. 4 Interior view of female opercular appendage. Original of Hall's figure, pl. 81, fig. 6 [see diagram, text fig. 123]. The outlines of the paired terminal appendages of the operculum (3 in diagram) and of the paired appendages of the second sternite (shaded in diagram, marked c) are seen; a, line along which the principal median appendage is broken, b, lateral flanges, × 2 |
| 5 | Appendages of a cephalothorax, showing their proportions. The chelicerae are not preserved. The walking legs are seen from the underside and exhibit the bases of the smaller spines. The balancing legs are mostly broken away, and only the coxae preserved of the swimming legs. Natural size |
All figures are from photographs. The originals are from the Bertie waterlime at Buffalo, Erie co , N. Y. Those of figures 1, 3 and 4 are in the American Museum of Natural History, that of figure 2 in the State Museum and of figure 5 in the Buffalo Society of Natural Sciences
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