MORRIS BRITISH FOSSILS. 



141 



The Graptolitesy 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. Ifone of the higher Crustacea 

 occur (neither, indeed, do they until the latest palaeozoic times) ; but 

 Entomostraca, especially TrilobiteSy 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. 



Oharacteristic genera. — Plants. — Cruziana, Palaeochorda. Zoophyta, Didymo- 

 grapsus, Diplograpsus, Pyritonema, ? Trichoides, Rastrites. Brachiopoda, Trematis ? 

 Gasteropoda, Maclurea. Pieropoda, Pterotheca. Cystidea, Agelacrinites, Caryocys- 

 tites, Hemicosmites, Echinosphasrites. Crinoidea, Glyptocrinus. u4w7je(?{(/a, Aphrodita, 

 Arenicolites, Myrianites, Nemertites, Nereites. Crustacea, ^glina, Amphion, 

 Agnostus, Angelina, Asaphus, Cybele, Cyphoniscus, Eccoptochile, Ogygia, Olenus, 

 Paradoxides, Remopleurides, Staurocephalus, Stygina, Tiresias, Hymenocaris, 

 Cytheropsis. Bryozoa, Graptopora. 



FOSSILS OF THE LINGULA, LLANDEILO, AND CARADOG BEDS. 



Plants ? 



Cruziana semiplicata, Salter, Sil. 45 PalaBOchorda ? teres, Harhness, Geol. 



Fucoides gracilis, Hall , G. N. Y. 69. Journ. xi. 474. 



? Chondrites informis, M'Coy, P. F. 1. 1 ? Trichoides ambiguus, Harkn., 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. 



Zoophyta (Anthozoa). 



Favosites alveolaris, Blainville, Sil, Syst. Heliolites tubulatus, Lonsd. S. S. t. 16. 

 t. 15 his, f. 2. f. 3. 



Gothlandicus, Lamarck, Sil. Nebulipora favulosa, Phillips, M. Geol. 

 Syst. 15 his f. 3, 4. ii. 385. 



Halysites catenularius, Linni, sp. S. S. lens, M'Coy, P. F. 28. 



t. 15 his, f. 14. papillata, M'Coy. P. F. 41. 



Heliolites favosus, M Coy, P. F. 15. Petraia 93quisulcata, M'Coy, P. F. 10 



inordinatus, Lonsdale, S. S. Pyritonema fasciculus, if' C^oy, P. F. 10. 



t. 16 his, f. 12. Sarcinula organum, Linn. Goldfuss, 

 interstinctus, Wahl. S. S. t. Petref. 73. 



16 f. 2. Stenopora fibrosa, Goldfuss. 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, <?'Or6,Prod. 51. 



