266 Prof. T. R. Jones and Mr. J. W. Kirkby on the 



41. Cythere superha, J. & K. (PI. IX. fig. 11.) 



Cythe.re superba, J. &. K., MS. 1880, Quart. Journ. Geol. Soc. 

 vol. xxxvi. p. 588. 



Large, oval or subovate, rather oblique , dorsal border 

 straight ; ventral border slightly incurved ; anterior extre- 

 mity rounded ; posterior rounded and higher than the other ; 

 both extremities angular dorsally ; valves convex or com- 

 pressed, rimmed, the right larger than the left and overlapping 

 it moderately on free margins ; lateral contour compressed- 

 oval, with pointed ends, or elliptical ; surface smooth in most 

 cases, in others faintly punctate. Length yV inch. 



This fine species requires several figures to illustrate it 

 properly, as it varies much in outline and convexity. Many 

 examples are tumid and big-bellied, others are comparatively 

 thin ; hence there are great differences in the outlines of lateral 

 contour (as seen from above or below) and end views. Some 

 casts show traces of a circular muscle-spot ; but we have never 

 observed anything like the eye-spot of Leperditia^ though in 

 some of its forms this species has much the style of that genus. 



It is confined to the Calciferous Sandstones. 



Localities. Buddo Ness, Billow Ness, east of Pittenweem, 

 and Craigkelly Quarry, Fifeshire ; Oakbank Sandstone 

 Quarry, Linlithgowshire. 



42. Cythere (?) ohtusa^ sp. nov. (PI. IX. figs. 12 a, 12 h.) 



Subovate (almost subpentagonal), highest behind, convex ; 

 dorsal border short and straight, ventral convex ; extremities 

 rounded, posterior largest ; right valve largest and over- 

 lapping the left on the free margin ; lateral contour suboval, 

 widest in centre; surface smooth. Length 3^ inch. 



This species is probably not a Cythere^ though now placed 

 in that genus until more is known about it. Two examples 

 only of it were found in a washing of shale from Woodend 

 Quarry (Lowick), Northumberhand, sent us by Mr. James 

 Bennie. 



This is not the Cythere ohtusa mentioned in the list of 

 Ostracoda in ' Catalogue of Western-Scottish Fossils ' (p. 44) ; 

 the species to which that name refers is a CythereUa — C. con- 

 cinna, J., K., & B. (Monogr. Foss. Entom., Pala3ont. Soc. 

 1884, p. 71). 



43. Bairdia legumen, J. & K. (PI. IX. figs. 13 a, 13 h.) 

 Bairdia Icffumen, J. & K., MS. 188-5, Geol. Mag. dec. 3, vol. ii. p. 540. 

 Elongate, subpentagonal, high in front, low and acuminate 

 behind ; dorsal border subangulate ; ventral border faintly 



