no. 3
burgess shale fossils—walcott
45
| Waptia circularis, new species | 24 | ||
| Fig. | 3. | (✕ 2.) Side view of a flattened specimen illustrating the form of the carapace, one side of which has been crushed upward and backward. The exopodites of the thoracic limbs appear to have the same structure as those of Waptia fieldensis. | |
| Mollisoina ? rara Walcott | 27 | ||
| Fig. | 4. | (✕ 2.) A retouched figure of a most excellent specimen. | |
Plate 22
| PAGE | |||
| Marrella splendens Walcott | 28 | ||
| Fig. | 1. | (✕ 4.) Dorsal view of a specimen showing the mandibles, the antenna on the left side extending down beside the mandible, and the exopodites referred to the maxillae and maxillulae; what may be the endopodite of the maxillulae is shown on the right side below the fringing filaments of the exopodite of the maxilla. | |
| 2. | (✕ 4.) In this ventral view the mandibles have been pushed forward so that the mandible and antenna on the right side are in a vertical position and side by side, and the endopodites of the maxilla and maxillula are in advance of their natural position; on the left side two endopodites of thoracic limbs are faintly outlined. | ||
| 3. | (✕ 4.) Ventral view of a specimen in which the joints of the mandibles have been crowded together and somewhat shortened; the proximal joint on the right side is well exposed by the labrum having been pushed forward; the inner margin of the joint is serrated but not quite as clearly shown as on the specimen represented by fig. 6. | ||
| 4. | (✕ 4.) The dorsal view of this specimen is illustrated to show the position of the antenna on the right side which is the same as the antenna on the left side in fig. 1, and on both sides in fig. 5; the position of the mandibles is also well shown. | ||
| 5. | (✕ 4.) Ventral view showing the position of the mandibles beside the labrum, also the exopodites of the maxillae and maxillulae posterior to them; the antennae appear to have been torn away in the crowding forward of the mandibles. | ||
| 6. | (✕ 4.) Ventral view of a specimen showing the mandibles, the one on the right side preserving the proximal joint with a serrated inner margin. This mandible has been colored white in order to bring it out more clearly in the reproduction; the thoracic exopodites are very clearly shown on both sides, the endopodites having been largely exfoliated. | ||
| 7. | (✕ 4.) Ventral view of a specimen preserving a complete mandible on the left side, also several endopodites of the thoracic limbs, and on the right side six joints of the mandible and a few imperfect thoracic endopodites, which are exposed on both sides by the exfoliation of the exopodites. | ||
