Reports and Proceedings— Geol. Soc. London. 139 
Many of the zoological and botanical notices, among the excerpts and 
abstracts, of which there is a list occupying sixteen pages, have 
useful bearings on the study of paleontology ; and in the rich 
bibliography many geological memoirs are noted. gS a 
IV.—A Monocrara or THE SiLuRIAN Fosstts oF THE GIRVAN 
District 1n AyrsHirE. By H. A. Nicuorson, M.D., D.Sc., ete., 
and R. Eruerrper, jun., F.G.8., etc. Fasciculus II. 8vo. pages 
137-234, Plates X.-XY. (Edinburgh and London: Blackwood 
and Sons, 1880.) 
HE Girvan Monograph, aided by the Royal Society’s grant, has 
special reference to the Silurian Fossils in Mrs. Gray’s collec- 
tion; and this second portion treats wholly of Crustacea—namely, 
the Trilobites that were not described in the first Fascicnlus, some 
Phyllopods, Cirripedes, and Ostracods. Of Trilobita, altogether 
twenty-one genera are recorded as having been found in the Girvan 
District, and are described with their sixty-three more or less definite 
species. These are all illustrated in the plates, excepting some 
specimens mentioned by Salter and M‘Coy, but now missing. Of 
Phyllopoda the following from Girvan are described :—Solencaris 
solenoides, J. Young ; Pinnocaris Lapworthi, R. E.jun.; Peltocaris (?), 
sp.: Dictyocaris (?), sp. The Cirripedia are represented by Turri- 
lepas scotica, R. E. jun. 
The Silurian Ostracoda from Girvan are here described by Prof. 
T. Rupert Jones (pages 216-223, pl. xv.). They are referred to 
Cythere Aldensis, M‘Coy, and var. major, Jones; C. Grayanu, J.; 
C. Wrightiana, Jones and Holl; Beyrichia Kledeni, M‘Coy; B. 
impendens, J.; B. comma, J.; Primitia Barrandiana, J.; and Entomis 
globulosa, J. 
The occurrence of these Crustacea in the several strata of the 
Girvan area is described in detail in the “General Remarks,” pp. 
223-233; and their geographical distribution is clearly shown by a 
large table. The descriptions are careful and exhaustive, enriched 
with conscientious references to other authors and comparisons of 
their results. The plates are good, except that pl. xv. appears to 
have been worn out or rubbed down too much. 
This will be a very handsome work when finished, and cannot fail 
to prove of standard importance. 
REPORTS AND PROCHEDIN GS. 
GrotoaicaL Soctrry or Lonpon. 
I.—January 21, 1880.—Henry Clifton Sorby, Esq., LL.D., F.R.S., 
‘President, in the Chair.—The following communications were read : 
1. “On the Genus Pleuracanthus, Agass., including the Genera 
Orthacanthus, Agass. and Goldf., Diplodus, Agass., and Aenacanthus, 
Beyr.” By J. W. Davis, Esq., F.G.S. 
The author commenced with an historical account of the supposed 
genera of fishes founded on remains occurring in Carboniferous and 
