230 TROCEEDINGS OF THE 



by the transverse rugose ridges on the ventral valve, which is 

 regularly convex, with an incurved beak. The dorsal valve is 

 deeply concave, folloAving closely the curvature of the opposite 

 valve, giving the shell very much the appearance of a productus. 



Mr Gray likewise exhibited a slab of Silurian shale, containing 

 numerous specimens of Entomostraca, belonging to the genus 

 Leperditia, and remarked that, so far as he was aware, it was the 

 first example of Entomostraca having been found in the Girvan 

 district — none, at least, having occurred during the last seven or 

 eight years of constant observation in that particular field. The 

 slab was taken from the mass at Aldons Quarry, about seven 

 miles south of Girvan. The species of Leperditia had not yet been 

 determined. 



Professor Young exhibited some specimens of Moa bones 

 recently presented, by Mr Wilkie Morris, to the Hunterian 

 Museum, on which he offered a few remarks. 



Mr J. Gilmour exhibited a very unusual specimen of the black 

 grouse (Tetrao tetrix), which he described as a female (the grey hen) 

 assuming the plumage of the male. The head and neck were 

 exactly those of a grey hen, the rest of the plumage resembling 

 that of a young male, the lateral tail feathers showing a tendency 

 to curve outwards. Mr Gilmour mentioned that the bird was 

 proved to be a female on dissection. 



Mr William Lorrain exhibited a specimen of the rose-coloured 

 pastor (Pastor roseus) — a male of the second year— which was 

 shot on the farm of Hundred Acres, near Glasgow, on the 7th of 

 August last. It had been seen previously associating with a 

 troop of common starlings. Mr Lorrain also exhibited a specimen 

 of the Great Spotted Woodpecker (Picus major) which had been'shot 

 at Ardgowan, near Inverkip, about the 17th of the present month. 

 The species but rarely occurs in the west of Scotland; but in the 

 eastern counties it appears to have become a regular winter 

 visitant for some years past, making its appearance occasionally in 

 very large flocks. Many hundreds had this year been seen in 

 Orkney and Shetland, and larger flights than usual appear to have 

 visited various districts of the north of Scotland. 



Mr J. A. Mahony exhibited an undescribed variety of Laminaria 

 digitata from county Galway. It presented no apparent structural 

 difference from the true Laminaria digitata, but had the peculiarity 

 of producing mannite on the surface of the frond after being 



