Page:The Habitat of the Eurypterida.djvu/169

Rh In the same shale band about a half a mile distant the following fossils were found, the eurypterids occurring in great abundance, but the Ludlow fish Thelodus scoticus being represented by only two fragments (215, 573):


 * Myriopoda ? (impressions of)
 * Ceratiocaris sp.
 * Dictyocaris ramsayi Salter
 * Pterygotus bilobus Salter
 * Slimonia acuminata Salter
 * Thelodus scoticus Traq.

In certain members of the Ceratiocaris group, though a little below the fish horizon, there are recorded from Long Burn, a tributary of Logan Water, the following species:


 * Modiolopsis nilssoni (His.)
 * Spirorbis sp.
 * Beyrichia kloedeni (M'Coy)
 * Beyrichia kloedeni var. torosa (Jones)
 * Lingula minima (Sow.)
 * Orthonota sp.
 * Ceratiocaris
 * Dictyocaris ramsayi (Salt.)
 * Pterygotus bilobus (Salt.)
 * Platyschisma (Trochus) helicites (Sow.)

The best development of the Ludlow fish band occurs about $$\tfrac{1}{2}$$ mile south of Logan House in which place also was found an excellently preserved scorpion Palaeophonus caledonicus. In the same place in a cliff about 30 feet high a good section is exposed, showing hard greywacke bands at the top, but below these are brown flaggy shales containing Ceratiocaris in abundance and a few Pterygotus fragments. Embedded in these shales are ironstone nodules which contain fish remains. From this outcrop the following fossils have been collected (215, 574):


 * Archidesmus loganensis Peach
 * Ceratiocaris longa Jones and Woodw.
 * Ceratiocaris murchisoni ? M'Coy
 * Ceratiocaris papilio Salter
 * Ceratiocaris slygius Salter