4 BRITISH SILURIAN BRACHIOPODA. 
other geological works ; and descriptions and figures of some new species by Profs. M‘Coy 
and Morris, Mr. Salter, Mr. D. Sharpe, Dr. Holl, myself, and others, occur principally in 
the ‘ Quarterly Journal of the Geological Society,’ ‘ Bulletin Soc. Géol. de France,’ and in 
the ‘ Annals and Magazine of Natural History ;’ but these will be referred to more in detail 
in the sequel. Some Scottish Silurian Brachiopoda have likewise been described and illus- 
trated by Mr. Salter, in the ‘Memoirs of the Geological Survey’ for 1861; and in 1865, 
by Mr. G. C. Haswell, in a little book ‘On the Silurian Formation of the Pentland Hills.’ 
Reference to a few Irish Silurian Brachiopoda will also be found in the ‘ Explanations of 
the Geological Maps’ published by the Geological Survey of Ireland. 
We will now briefly mention the principal works published on the Continent and in 
America, wherein Silurian Brachiopoda have been described and illustrated, and to which 
we have been obliged to refer during the preparation of the present Monograph. 
SWEDEN. 
Linnaus, as already stated, appears to have been the earliest author who described 
Silurian Brachiopoda, for Bromel and Stobzeus only give them a passing notice. 
In 1753, in the ‘ Museeum Tessinianum ’ (one vol. folio), he enumerates four species of 
Silurian Brachiopoda; but the figures are not good, and it is consequently difficult to be 
certain as to the forms to which they belong. Herr Lindstrém, however, considers 
Anomia subglobosa, p. 88, pl. v, fig. 6, &c., to be equivalent to the Anomites lacunosus of 
Wahlenberg ; Axomia angulis lateralibus dilatatis, p. 90, pl. v, fig. 7, &c., is supposed, 
from the description and figure given, to be identical with the species now generally known 
as Spirifera sulcata, but which, according to the rules of priority, should bear the name of 
Sp. crispa given to it by Linnaeus in the twelfth edition of his ‘Systema.’ Anomia 
subrotunda, p. 88, pl. v, fig. 5, 1s a Rhynchonella, but difficult to determine; while 
Conchidium biloculare, p. 90, pl. v, fig. 8, aA, B, is certamly what we now call Pentamerus 
conchidium, as the habitat given is Gothland, &c. But it is in the twelfth edition of the 
celebrated ‘Systema Nature,’ the last published by the eminent Swedish naturalist, 
that we find the greater number of Silurian Brachiopoda described. This edition, which 
by universal consent is considered to be the best, was published by Linnzus in three 
volumes, the first printed at Holmia (Stockholm), 1766, bearmg on its title-page 
“Ed. xu™ reformata.” The second volume (named Tomus i, pars 11), printed in 1767, 
contains his notice of the Silurian Brachiopoda, viz., p. 1152, No. 227, Anomia pecten 
(our Strophomena pecten) ; 230, A. reticularis (= Atrypa reticularis) ; 231, A. plicatella ; 
232, 4. erispa (= Sp. sulcata); 238, A. lacunosa (=Rhynchonella Wilsoni, Sow. ?) ; 
240, A. biloba (= Orthis biloba). Again, it is to Tomus ii, p. 164, printed in 1768, that 
Wahlenberg refers when mentioning Anomites novem-striatus. 
Before (for the present) dismissing Linneus’ labours, we must refer to Sylvanus 
Hanley’s ‘Ipsa Linnzei Conchylia,’ published in 1855, containing his own, the late Mr. 
