1 '11 PROCEEDINGS OF THE 



field which, it is desirable to see at another time, a mark is made 

 on the top edge of the slide where it is intersected by the perpen- 

 dicular line upon the stage, and another mark on the end of the 

 slide where it is intersected by the horizontal line. If the slide is 

 not covered, this may be made on the glass with a writing 

 diamond, or with ink, if covered with paper. Should a diamond 

 not be at hand, narrow slips of paper could be put on the glass, 

 and the marks made on them, and, by placing the slide exactly 

 in the position indicated by these marks, the object can at any 

 time be readily found in the field of view. 



PAPERS READ. 



I. — Descriptive Notes on several new and rare forms of Entomostraca 

 from the Carboniferous Limestones and Shales of the West of 

 Scotland. By Mr John Young. 



This paper was illustrated by a large series of specimens 

 and magnified drawings. The m_ost of the species exhibited 

 by Mr Young were new to science, and had been discovered by 

 himself and his associates during the past year. From the 

 limestone shales of Orchard Quarry, near PoUokshaws, he had 

 obtained the following new species, in excellent preservation: — 

 Beyrichia ragiata, B. symmetrica, Eichwaldia Upartita, Bairdia sub- 

 mucranata, Cythere cornigera, Cythere ventricornis, and Kirkbya Per- 

 miarm, the last species being new to carboniferous strata, having 

 been first described from the Permian formation of England. 

 From the limestone of Campbeltown he had procured Eichwaldia 

 Scotica; from the shales of East Kilbride, Beyrichia bituhercidata, 

 B. multiloba, Kirhjba Urii; and from the limestone of Craigenglen, 

 Campsie, Cythere Rankineana, C. pungens, C. secans, and C. fabulina. 



II. — On the Ascidice found in the West of Scotland. By Dr Scouler. 



This paper was illustrated by an extensive series of specimens 

 obtained by the author when dredging in various localities. Among 

 the species which he exhibited were the following: — Clavellina 

 Savigniana, C. lepadiformis from Oban; Botryllus pohjcyclus, and 

 B. Schlosseri, and an undescribed species of the same genus, from 

 Loch Eribol; Molgula tubulosa, Amcercscium argus, and A. albi- 

 cans; Peloncea corrugata, Le'poclinuvi gelatinosum, Aplidium 

 fallax, etc., etc. 



