MORRIS BRITISH FOSSILS. 
141 
The Graptolitcs, which probably represent the modern Hydroid 
zoophytes, or Bryozoa, according to some observers, are numerous, 
especially those having a double series of cells. The Graptolites are 
characteristically Silurian. The Echinoderms of this period are chiefly 
Cystideans. Annelides are numerous. None of the higher Crustacea 
occur (neither, indeed, do they until the latest palajozolc times) ; but 
Entomostraca, especially Trilohites, supply the dominant forms of life. 
The Brachiopoda are numerous in species. The other lamellibranchiate 
molluscs are chiefly the Nuculoid, Aviculoid, and Mytiloid forms. The 
Gasteropoda belong to the holostomatous division. The Cephalopods 
are chiefly represented by the genus Orthoceras. 
G haracteristic genera. — Plants. — Cruziana, Palasochorda. Zoophyta, Didymo- 
grapsus, Diplograpsus, Pyritonema, ? Trichoides, Rastrites. -Sracfe'oporfa, Trematis ? 
Gasteropoda, Maclurea. Pieropoda, Pterotheca. CyUidea, Agelacrinites, Caryocys- 
tites, Hemicosmites, Echinosphajrites. Crinoidea, Glyptocrinus. ^«nc&Wa,Aphrodita, 
Arenicolites, Myrianites, Nemertites, Nereites. Crustacea, JSglina, Araphion, 
Agnoatus, Angelina, Asaphus, Cybele, Cyphoniscus, Eccoptochile, Ogygia, Olenus, 
Paradoxides, Remopleurides, Staurocephalus, Stygina, Tircsias, Hymenocaris, 
Cytheropsis. Bryozoa, Graptopora. 
FOSSILS OF THE LINGULA, LLANDEILO, AND CARADOC BEDS. 
Plant.e ? 
Cruziana semiplicata, Salter, Sil. 45 Palseochorda ? teres, Harkness, Geol. 
Fucoides gracilis, Hall , G. N. Y. 69. Journ. xi. 474. 
? Chondrites informis, M'Coy, P. F. 1. 1 ? Trichoides ambiguus, llarkn., Geol. 
A. f. 4. Journ. xii. 249 
? regularis, Harkness, Geol. 
Journ. xi. 473. 
Amorphozoa. 
Acanthospongia Siluriensis, M'Coy, Sil. Cliona antiqua, Portlock, Geol. Rep, 
Foss. 67. 360. 
ZoorHTTA (Anthozoa). 
Favosites alveolaris, Blainville,^\\, Syst. Heliolites tubulatus, Lonsd. S. S. t. 16. 
t. 15 his, f. 2. f. 3. 
Qothlandicus, Lamarck, Sil. Nebulipora favulosa, PhiUips, M. Geol. 
Syst. 15 bis f. 3, 4. ii. 385. 
Halysites catenularius, Linni, sp. S. S. lens, M'Coy, P. F. 23. 
t. 15 bis, f. 14. papillata, M'Coy. P. F. 41. 
Heliolites favosus, M'Coy, P. F. 15. Petraia tequisulcata, M'Coy, P. F. 10 
inordinatus, Lonsdale, S. S. Pyritonema fasciculus, M'Coy, P. F. 10, 
t. 16Ws, f. 12. Sarcinula organum, Linn. Goldftiss, 
interstinctus, Wahl. S. S. t. Petref. 73. 
16 f. 2. Stenopora fibrosa, Gold/uss, sp., Petref. 
megastoma, M'Coy. P. F. 16. Germ. 82. 
petalliformis, Lonsd. S. S. t. Stephodes Craigensis, M'Coy, P. F. 30. 
16. f, 4. Stromatopora striatella, rf'Ori>, Prod. 51. 
