72 Miscellaneous. 



2. "On some Falseozoic Ostracoda from the Girvan district in 

 Ayrshire." By Prof. T. Eupert Jonea, P.R.S., F.G.S. 



This paper aims at the completion of the palseontological 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, BeyricJiia, Uh-ichia, Salcuna, and Cupridina, 

 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 Xicholson and Etheridge's ' ITouograph,' the 

 specimens have all been collected by Mrs. Elizabeth Gra}', 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 yars. major and minima, 

 P. iwrifera, P. ampJioralis, P.jugosa, P. bi-gibbosa, and P. galeata. 

 The genus is, however, placed in the sub-order Cheilostomata, thus 

 reco2;nized for the first time in the Jurassic Series. 



MISCELLANEOUS. 



On the Circulatory Apparatus of Mygale ca^mentaria, WaJck, 

 By M. Marcel Causaed, 



The circulatory apparatus of the Araneida Tetrapneumones has 

 hitherto been ven,- little studied. So far as I am aware, the only 

 authors who have dealt with this subject are Duges, who, in the 

 illustrated edition of Cuvier's ' Eegne Animal,' has figured the heart 

 of the mason Mygale {Ntmesia ccenientaria), and M. Blanchard, who, 

 after having brietly described the results obtained from the investi- 

 gation of Mygale (^Tlierapiliosa) Blondii, in the ' Comptes Rendus de 

 TAcademie,' t. xxsiv. 1852, gave a representation of the circulatory 

 apparatus of this spider in his ' Organisation du Regne Animal' 

 (Aracbnides, pis. 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 



