NATURAL HISTORY SOCIETY OF GLASGOW. XXXV 



Mr. James Steel exhibited a specimen of Helix hispida, L., var 

 albida, Jeff., found by Mr. Thomas Scott, Corresponding Member, 

 in Bute. 



A number of Microscopic Specimens were afterwards exhibited. 

 Among the most important of these were two specimens of the 

 primordial cartilaginous skull of the Frog, Rana temporaria, L., 

 corresponding to stages 2 and 3 of Kitchen Parker, exhibited by 

 Mr. R. Broom, B.Sc. In the earlier of the two, the trabecule, 

 mandibular, and hyoid arches were seen distinct from the 

 parachordal cartilages and from each other. 



Mr. Thomas King, Vice-President, showed a series of tangential 

 sections from the cambium-layer of various dicotyledonous angio- 

 sperms, showing secondary thickening. 



2nd August, 1887. 



Mr. R. Turner, Vice-President, in the Chair. 



Mr. Richard M'Kay reported on an excursion made to Loch- 

 winnoch on 2nd ulto.* 



Mr. Ewing made some remarks on an excursion made to the 

 Killin district during the Glasgow Fair holidays, and stated that 

 he would afterwards report more fully on this excursion. t 



Mr. James Steel reported on an excursion made to Rottenburn, 

 near Greenock, on 30th ulto. % He exhibited living specimens of 

 Acme lineata, Drap., found at the excursion, and stated that this 

 mollusc had not previously been obtained alive in the district. 



On behalf of Mr. Thomas Scott, Corresponding Member, Mr. Steel 

 showed specimens of Hydra vulgaris, Pallas, from Greenan Loch, 

 Bute; and of Cristatella mucedo, Cuv., found on the leaves and 

 stems of Water-lilies in the same loch. The latter is interesting as 

 apparently the only hydrozoon which is locomotive, moving from 

 place to place by means of its flattened disc. It possesses the horse- 

 shoe arrangement of the tentacles found in fresh-water polyzoa. 



Mr. R. Broom, B.Sc, exhibited specimens of Rumex Hydrolapa- 

 thum, Huds., from the neighbourhood of Drummond Castle, Perth- 

 shire. 



Mr. D. A. Boyd showed a specimen of Eurhynchium abbreviation, 

 Schpr., a recent addition to the British Moss-flora, discovered at 

 Ross, Herefordshire, by the Rev. A. Ley. 



* Transactions, vol. ii., p. 323. f Ibid., p. 323. J Ibid., p. 327. 



