CYTHERELLA. 



77 



with a transverse wrinkly reticulation, of variable strength ; the meshes sometimes strong, 

 long, and with a tendency to be concentric ; sometimes faint and scarcely discernible. 



Length '84; height -6; thickness '44 mm. Proportions 23 : 15 : 11. 



This is a rather , common form. It occurs among the Carboniferous Entomostraca 

 from East Kilbride,^ in the Hunterian Museum (R. Coll. Surgeons), as collected and 

 mounted by the Rev. D. Ure and given to John Hunter; also collected by Mr. D. 

 Robertson, F.G.S,, from the Upper Limestone Series at Williamswood,^ near Glasgow; 

 Brockley, Lesmahagow Calderside* Quarry, Lanarkshire ; Calderwood/ No. 1 lime- 

 stone quarry ; and Limekilns, East Kilbride ; and at Robroystone,^ by Mr. John Young, 

 F.G.S. Also, by the Geological Survey of Scotland, at Wilsontown'^ (Head of Mouse- 

 water), in the Hosie Limestone ; at Boghead, Hamilton,® in shale between the limestones 

 Nos. 1 and 2 of the Calderwood series ; and on the River Avon,^ below Kinneil Mill, 

 Linlithgowshire. 



With reference to the preservation of some of the above-mentioned specimens (such as 

 figs. 9 and 10 a) in the Hunterian Museum, we may mention that in 1793 the Rev. 

 David Ure, of Rutherglen, noticed the existence of certain " microscopic bivalved shells " 

 (Ostracoda) in the Carboniferous Limestones near Glasgow, and supplied his friends with 

 suites of these little fossils, together with minute Gasteropods ; and a tastily mounted set, 

 in a glazed frame, is still preserved in the Hunterian Museum, Lincoln's Inn Fields. 

 Another such set, now in the University Museum, Glasgow, was given to Dr. William 

 Hunter. Four or five of these Ostracoda were figured and described by Ure in his 

 ' History of Rutherglen and East Kilbride,' &c. (8vo, Glasgow, 1793). One of these 

 (pi. 14, fig. 15), a small reniform Cythere (?), was found by him abundantly; another 

 (fig. 20), a triangular Bairdia (apparently crushed, a condition in which, he says, they 

 are sometimes found), was much scarcer, was obtained at Lawreston and Stuartfield, and 

 in a limestone quarry, fifteen miles west of Newcastle-on-Tyne, near the spot where the 

 Roman wall is intersected by Watling Street. Ure's figs. 16, 17, and 21 are Beyrichia 

 and K.irJchya : these were the scarcest of all. Among the mounted specimens in the 

 Hunterian Museum are distinguishable — Cythere, Bairdia, Kirhhya, and Cytherella 

 but, as they lie loose and crowded in their little cells, it is difficult to get at their exact 

 features. 



Foreign Carboniferous Cytherell^. 



18. Cytherella Benniei, var, Iowensis. Nov. Plate VI, figs. 17 a, b. 



A very strong and large Cytherella, with thick, elliptical-oblong valves, compressed 

 anteriorly, and swollen behind. It is much like C. Benniei, figs. 3, 4, 5, and 7, and 

 1 'Cat. W.-Scot. Foss.,' 1876, p. 78. 2 Hjid.^ p, 92. s Ibid., p. 77. * Ibid., p. 68. 

 ^ Ibid., p. 68. « Ibid., p. 88. 7 Ibid., p. 92. « Ibid., p. 82. 



^ Ibid., p. 82. C. concinna and C. scrobiculata of the present Monograph. 



