CAMBRIAN GEOLOGY AND PALEONTOLOGY
II
No. 2.—MIDDLE CAMBRIAN MEROSTOMATA
By CHARLES D. WALCOTT
(With Six Plates)
CONTENTS
PAGE | |||
Introduction | 18 | ||
Cambrian Merostomata | 19 | ||
Classification | 19 | ||
Relations to pre-Cambrian Merostomes | 21 | ||
Sub-order Limulava, new sub-order | 21 | ||
Family Sidneyidae, new family | 22 | ||
Genus Sidneyia, new genus | 22 | ||
Sidneyia inexpectans, new species | 24 | ||
Cephalo-thorax | 24 | ||
Abdomen | 24 | ||
Ventral appendages | 25 | ||
Cephalo-thorax | 25 | ||
Abdominal | 26 | ||
Genus Amiella, new genus | 27 | ||
Amiella ornata, new species | 27 | ||
Cephalo-thorax | 27 | ||
Abdomen | 28 | ||
Surface | 28 |
ILLUSTRATIONS
Plate | PAGE | |
2. | Sidneyia inexpectans | 30 |
3. | Sidneyia inexpectans | 32 |
4. | Sidneyia inexpectans | 34 |
5. | Sidneyia inexpectans and Amiella ornata | 36 |
6. | Neolenus serratus and Sidneyia inexpectans | 38 |
7. | Sidneyia inexpectans and Beltina danai | 40 |
Smithsonian Miscellaneous Collections, Vol. 57, No. 2
17