72 Miscellaneous. 
2. “On some Paleozoic Ostracoda from the Girvan district in 
Ayrshire.” By Prof. T, Rupert Jones, F.R.S., F.G.S8. 
This paper aims at the completion of the paleontological account 
of the Girvan district, so far as the Ostracoda are concerned ; and 
follows up the researches indicated in the ‘Monograph of the 
Silurian Fossils of the Girvan District in Ayrshire,’ by Nicholson 
and Etheridge, vol. i., 1880. 
In about a dozen pieces of the fossiliferous shales, submitted for 
examination some few years ago, the writer finds nearly thirty 
specimens of Primitia, Beyrichia, Ulrichia, Sulcuna, and Cypridina, 
which show interesting gradations of form, not always easy to be 
defined as specific or even varietal, but valuable as illustrating modi- 
fications during the life-history of individuals, thus often leading 
to permanent characteristics of species and genera. Like those for- 
merly described in Nicholson and Etheridge’s ‘Monograph,’ the 
specimens have all been collected by Mrs. Elizabeth Gray, of 
Edinburgh. 
3. “On some Bryozoa from the Inferior Oolite of Shipton Gorge, 
Dorset.—Part II.” By Edwin A. Walford, Esq., F.G.S. 
As we pass backward in time, the characters of the two sub-orders 
Cheilostomata and Cyclostomata merge. The accessory organs of 
the genus and species described in this paper illustrate this state- 
ment. The genus is named Pergensia, and the following new 
species are described :—P. nidulata, and vars. major and minima, 
P. porifera, P. amphoralis, P. jugosa, P. bi-gibbosa, and P. galeata. 
The genus is, however, placed in the sub-order Cheilostomata, thus 
recognized for the first time in the Jurassic Series. 
MISCELLANEOUS. 
On the Circulatory Apparatus of Mygale cementaria, Walch. 
By M. Marcer Cavsarp, 
Tue circulatory apparatus of the Araneida Tetrapneumones has 
hitherto been very little studied. So far as I am aware, the only 
authors who have dealt with this subject are Dugés, who, in the 
illustrated edition cf Cuvier’s ‘ Régne Animal,’ has figured the heart 
of the mason Mygale (Nemesia cementaria), and M. Blanchard, who, 
after having briefly described the results obtained from the inyesti- 
gation of Mygale (Theraphosa) Blondii, in the ‘ Comptes Rendus de 
lAcadémie,’ t. xxxiv. 1852, gave a representation of the circulatory 
apparatus of this spider in his ‘ Organisation du Régne Animal’ 
(Arachnides, pls. xv. & xvi.). 
Since I had not at my disposal any of the large American species 
of Mygale, I had to content myself with our humble mason Mygale 
of Provence. In the present communication I shall concern myself 
