FACTS AND OBSERVATIONS. xxvii 



Trochocystites Bohemicus in the Primordial of Bohemia and Spain, and of Scyphocrinites elegans in 

 the Upper Silurian of Sweden and Bohemia. 



Of the seven species of Annelida (Bohemian) seen in other basins, two belong to the derived 

 class, and tliree or four are native (see ' Thesaurus ') ; Spirorbis Lewisii, also in Bohemia, is of 

 doubtful origin. 



Of the forty-three species of Bohemian Trilobites (out of 369) which have inhabited other 

 regions, it may be assumed that thirty-five are native. Pour of these are Primordial ; and for the 

 others we can detect no earlier first appearance in other countries. Five species of the forty-three 

 are in the same zone in all places ; no one birthplace can be assigned to them. May they not be 

 from distinct acts of creation ? Five Bohemian Trilobites, Calymene Baylei, C. complicata, C. Blu- 

 menbachii, Phacops apiculatus, and Sphcerexochus mirus, seem to be strangers. 



Whether the Bohemian beds be the argillaceous slate of the lower stage, or the argillaceous lime- 

 stone of the upper, Trilobites found there a congenial habitat. Very few migrated, and almost as 

 few entered the district from other parts. 



Of the nine Polyzoa in Bohemia (not Graptolites), none are known out of the Bohemian strata ; 

 and these have been very recently determined by M. Barrande. 



The Graptolitidae are far more freely and widely dispersed than any other kind of Silurian life 

 many species being common to Australia, Europe, and America *. 



The Bohemian Graptolitidee are also largely distributed over the world. Only three of its twenty-six 

 species are restricted to their own native area a circumstance not observed in any other Silurian order. 

 In eight species the priority of appearance is doubtful, the dates being the same in the various 

 countries. Fourteen species are foreign ; for their earliest appearance has taken place not in 

 Bohemia, but in Australia, England, France, &c.f 



Brachiopoda, Bohemia possesses 321 species of this order ; and, except seventeen, they are all 

 native. Sixty-seven are met with in other parts of the world ; and of them fifty are either natives 

 or are undistinguishable from them. The seventeen foreigners are all in parts of the lower stage, 

 except two, which show first in the middle stage J. More Bohemian Brachiopoda may be expected 

 in other areas ; but I have not as yet had time to follow them. 



Monomyaria. Only one Bohemian species of this order has been seen out of Bohemia. It 

 is known also at Dudley and other places in England, and on the same horizon as in Bohemia, 

 and therefore of doubtful birthplace. 



Dimyaria. Of the sixty-six Bohemian Dimyaria, only four are known elsewhere, viz. : Cardiola 

 fibrosa (Wales, Ireland, &c.) without change of horizon ; C. interrupt a, in Caradoc in Lancashire, 



* Natives. Acidaspis Buchii, ^Eglina rediviva, M. speciosa, Agnostus rex, Arionellus ceticephalus, Asaphus 

 nobilis, Bronteus thysanopeltis, Calymene brevicapitata, C. diademata, C. incerta, C. pulchra, Cheirurus claviger, 

 C. insignis, Conocoryphe coronata, Cyphaspis Burmeisteri, Dalmania Hausmanni, D. Phillipsii, D. proavia, D. socialis, 

 Deiphon Forbesii, Harpes venulosus, Illaenus Salteri, Paradoxides spinosus, Phacops breviceps, P. proaevus, Placoparia 

 Zippei, Polyeres Dufresnoyi, Polytomurus euglypta, Remopleurides radians, and five Trinuclei. 



t Native. Graptolithus Bohemicus, G. chimaera, G. Romeri. Doubtful. Graptolithus Linnaeus, G. peregrinus, 

 G. Proteus, G. spiralis, Climacograptus bicornis, Dictyonema Bohemica, D. gracilis, Diplograpsus Linaei. Foreign. 

 Graptolithus Beckii, Scotland ; G. colonus, France ; G. Halli, Scotland ; G. latus, Skiddaw ; G. Nilssoni, Skiddaw ; G. 

 nuntius, Scotland; G. priodon, Scotland; G. Sagittarius, Scotland; G. testis, France; Diplograpsus ovatus, South 

 Australia; D. palmeus, Thuringia; Rastritea peregrinus, Scotland; Retiolites Geinitzianus, France; R. venosus, 

 Wales. 



J Foreigners. Atrypa compressa, Britain; A. marginata, Britain and America ; A. imbricata, Ireland; Leptaena 

 sericea, Spain fyc. ; L. transversalis, Britain ; Discina reversa, Esthonia, Bohemia, fyc. ; Merista naviformis, New York : 

 Orthis elegantula, Britain ; O. hybrida, Ohio ; O. Lusitanica, Portugal ; 0. orbicularis, Baltic ; Pentamerus linguiferus, 

 Wales; Rhynchonella cuneata, Scotland; R. navicula, England; R. Wilsoni, Britain; Strophomena pecten, Britain; 

 S. funiculata, Sardinia. 



