Anus small, sub-marginal.
Papillary tubercles numerous, especially in the ambulacral areas, and in the center beneath, not prominent, situated in comparatively deep and sub-angular cavities.
| Greatest diameter | 1.34 | inches. |
| Shortest diameter | 1.26 | ” |
| Height | 0.34 | ” |
Locality: Kirker’s Pass formations; occurs as the preceding species; also two miles west of Walnut Creek House.
From the collections of the California Academy of Natural Sciences, of the State Geological Survey, and my own.
Echinarachnius van Phels.
E. Brewerianus Rém.
Disk small, oval-elongated, broader behind, rather thin.
Upper surface slightly convex; margin rounded.