explanations of plates.
PPP. 37
| Fig. | 7. | A terminal joint of one of the large swimming feet, showing the serrated margin enlarged to two diameters. The terminal plate is restored in outline. |
| Fig. | 8. | A separated metastoma, showing the form and ornamentation enlarged to two diameters. |
Eurypterus potens, n. sp.
| Fig. | 9. | A portion of a large ectognath. |
| Fig. | 10. | A large fragment of indeterminate relations, possibly a portion of a large ectognath. A colony of Spirorbis is represented on the upper right hand angle attached to some underlying substance, probably of a plant. |
PLATE V.
Eurypterus Mansfieldi.
Page 32.
| Fig. | 1. | An imperfect specimen, preserving the segments of the abdomen, the telson and the large swimming appendages. |
| Fig. | 2. | A smaller individual, nearly entire, showing on the last abdominal segments what appear to be the articulating surfaces of the segments, or folds produced by the pressing together of the upper and under surfaces. |
| Fig. | 3. | A large specimen, showing the entire form. Four of the palpi are preserved, and a portion of the right swimming foot has been uncovered under the abdominal segments. The specimen being too long for the plate, the extremity of the telson is represented as broken and its continuation given above. The spinous processes at the post-lateral angles of the segments are well-preserved, and show a distinctive ornamentation. |
| Fig. | 4. | An enlargement, to six diameters, of the edge of a portion of the left lateral margin of the segments, showing the striated edge and the narrow, triangular scales with minute intermediate scales. |
