Palceozoic Bivalved Entomostraca. 181 



and in Westmoreland, and it has the umbo quite regular 

 sometimes. The frill may be obsolete, or easily lost perhaps, 

 as in the fringed Beyrichice. 



K. umbonata occurs in the following localities : — 

 Scotland. Carboniferous Limestone (Lower) : Brockley 

 and Hairmyers, in Lanarkshire ; Craigenglen, in Stirling- 

 shire ; Whitefield and Carlops, in Peeblesshire; Hillhead 

 Quarry, near Cockmuir Bridge, in Edinburghshire ; Kidlaw 

 Quarry, Catcraig, Burlage Quarry, East Salton, in East 

 Lothian ; Wilkieson, Ladedda, Charleston, Cowdens Quarry, 

 coast east of St. Monans, in Fifeshire. 



England. Carboniferous-Limestone series : Scremerston, 

 Barmoor Bedhouse (Lowick), Ridsdale, in Northumberland; 

 Calees, in Cumberland. In the Scar Limestone : at Arnside 

 and in a railway-cutting near Heversham, Westmoreland. 



3. Kirkbya oblonga, Jones & Kirkby. (PI. III. fig. 3; 

 and varieties, figs. 4, 5, and 6, a } b.) 



Kirkh/a obloxqn, J. & K., 1867, Trans. Geol. Soc. Glasgow, vol. ii. 



p. 221 ; 187*1, vol. iii. Suppl. p. 28. 

 Kirkbya oblonya, Armstrong and others, 1876, Catal. W.-Scot. Foss. 



p. 44. 



Oblong-ovate, convex ; height (which is uniform in the 

 central third) equal to half the length or more. Dorsal 

 border almost straight, but rather concave ; ventral border 

 usually straight in the central third ; extremities boldly 

 rounded and almost alike. In some cases the regular con- 

 vexity of the valves is scarcely broken except by a slight 

 medio-dorsal depression ; in others this depression is more 

 pronounced and the valves become rather humped towards 

 the extremities ; and in some specimens a circular boss appears 

 in the centre. A slight rim bounds the free margins of the 

 valves ; in certain specimens a second is added, and occasion- 

 ally the reticulation of the surface shows a tendency to 

 develop itself into other less regular concentric wrinkles. 

 Lateral contour subovate. Subcentral pit oval, often obscure. 

 Surface covered with rather large hexagonal reticulation. 



Length -gWV incn> 



This species was discovered by our friend Mr. John Young, 

 of Glasgow. It is a near ally of K. permiana ; but, although 

 the latter sometimes takes on a curved subcentral riblet (see 

 Trans. Tyneside, 1859, pi. x. a. fig. 5 a), yet it never loses its 

 marginal rims or its strong dorsal angles. 



Localities. — Scotland. Carboniferous Limestone (Lower) : 

 Brockley, Lanarkshire ; Craigenglen, Stirlingshire ; coast east 



