LOWEli DEVONIAN ROCKS. 
453 
Fig 519. 
Bronteus flahelUfer, Goldf. 
Acroculia^ EuompJictlus^ an d MurchisojiicL Fig. sis. 
Pteropods occur, such as Coniilaria (Fig. 
518), and Cephalopods, such as Cyrtoce- 
rasy GyroceraSy Ort/ioceras, and others, 
nearly all of genera 
distinct from those 
prevailing in the Up¬ 
per Devonian Lime¬ 
stone, or Clymenien- 
kalk of the Germans 
already mentioned (p. 
450). Although but 
few species of Trilo- 
bites occur, the char¬ 
acteristic Bronteus G^>nularia ornata, D’Arch. 
7 iTn Vem. (Geol. 
jiabelllfer (h Ig. 5 1 9) is Traus., Sec. Ser., vol. Vi. 
far from rare, and all coio^^e. 
Mid. Devon; s. Devon; collectors are familiar 
and the El el. with its faii-like tail. In this same group, 
called, as before stated, the*Stringocephalus, or Eifel Lime¬ 
stone, in Germany, several fish remains have been detected, 
and among others the remarkable genus Coceosteus^ covered 
with its tuberculated bony armor; and these ichthyolites 
serve, as Sir R. Murchison observes (Siluria, p. 362), to iden¬ 
tify this middle marine Devonian with the Old Red Sand¬ 
stone of Britain and Russia. 
Beneath the Eifel Limestone (the great central and typi¬ 
cal member of “ the Devonian” on the Continent) lie certain 
schists called by Ger¬ 
man writers “Calceola- b 
schiefer,” because they 
contain in abundance 
a fossil body of very 
curious structure, Cal- 
ceola sandalina (Fig. 
520), which has been 
usually considered *a 
brachiopod, but which 
some naturalists have lately referred to a Goniophyllum, sup¬ 
posing it to be an abnormal form of the order Zoantharia ru- 
gosa (see Fig. 474, p. 431), differing from all other corals in 
being furnished with a strong operculum. This is by no means 
a rare fossil in the slaty limestone of South Devon, and, like 
the Eifel form, is confined to the middle group of this country. 
Lower Devonian Eocks. —A great series of sandstones and 
glossy slates, with Crinoids, Brachiopods, and some corals, oc- 
Fig. 520. 
Calceola sandalina, Lara. Eifel; also South Devon. 
a. Ventral valve, b. Inner side of dorsal valve. 
