Palceozoic Bivalved Entomostraca. 255 



Leperditia scotohurdigulensis, J. & K., 18G6, Ann. & Mag. Nat. Hist. 

 ser. 3, vol. xviii. p. 34 ; Jones, 1884, Proc. Berw. Nat. Club, vol. x. 

 pp. 3'21 and 324, pi. ii. figs. 7 and 9. 



Suborbicular, slightly oblique, convex ; height thi'ee fourths 

 of length ; dorsal border short ; ventral border and extremities 

 continuous and boldlj curved ; lateral contour elliptical in 

 males (?), ovate in females (?), greatest width rather in front 

 of centre ; valves rimmed, left moderately overlapped by 

 right ; muscle-spot circular, convex within, concave without ; 

 surface smooth. Length -^ to ^V inch. 



In many localities where this species occurs there are both 

 thin and fat specimens, as in the case of Leperditia Oheni 

 and other species ; the former we regard as probably males, 

 the latter as females, similar differences of carapace being 

 well known to mark the sexes in many cases among recent 

 Ostracoda. 



L. scotohurdigalensis was noted and illustrated by a poor 

 woodcut in Hibbert's classical memoir on the Burdiehouse 

 Limestone. It is not therefore an absolutely undescribed 

 species ; but, for the sake of easy reference, we include a 

 notice of it in this paper. 



It is about the most common and characteristic Ostracod 

 of the Lower Carboniferous strata of Scotland. Some of the 

 shales and limestones of that series are filled with its remains, 

 and it is found on many horizons. 



Localities. In Carboniferous-Limestone series : Hurlet Pits, 

 Renfrewshire; Craig Burn (Douglas), Braidwood Burn (Car- 

 luke), Lanarkshire ; Tweedmouth &c., Northumberland. 



In Calciferous Sandstones: Billow Ness, Pittenweem, 

 Caiplie, Randerstone, Pitmilly Burn, Buddo Ness, Craigkelly 

 Quarry, Grange Quarry, in Fifeshire ; Burdieliouse, Craig- 

 lockhart. Water of Leith, in Midlothian ; Linnhouse Water, 

 near Oakbank Oil- works, Linlithgowshire ; Penton Bridge, 

 Dumfriesshire ; south of Cockburnspath, Burnmouth, in 

 Berwickshire. 



13. Leperditia parallela, J. & K. 

 (PI. VII. figs. 5 a, 5 h.) 



Leperditia parallela, J. & K., 1865, Ann. & Mag. Nat. Hist. ser. 3, 

 vol. XV. p. 407, pi. XX. figs. 6«, 6 &. 



This species was figured and described from Bavarian 

 specimens in 1865, as quoted above. We figure it anew 

 from British examples and on a larger scale ; but we can add 

 nothing to the description then given. It is rare and has 

 occurred to us only i'rom the following localities : — 



Carboniferous-Limestone series: Ladedda Quarry, Fifeshire; 

 and railway-tunnel near Bristol. 



