258 MESSES. G. W. LAMPLTJGH AND J. E. WALKEE ON [May I903, 



The specimens of Kingena lima which occur at Shenley show the 

 usual characters of the species — the short recurved beak truncated by 

 a large circular foramen lying close to the umbo, the convexity of the 

 valves, the granulations on the test of the shell. The dorsal valve 

 shows a dark longitudinal line, indicating the presence of a septum. 

 The smaller specimens resemble those from Warminster. 



Dimensions of a large specimen: — length=17 millimetres: 

 breadth = 15 mm. ; thickness = 17 mm. 



Kingena aeenosa (d'Archiac). 



1847. Terebratula arenosa, d'Archiac, ' Fossiles du Tourtia ' Mem. Soc. Geol. 

 France, ser. 2, vol. ii, p. 324 & pi. xxi, figs. 1-3. 



We have collected at Shenley several specimens of this species ; 

 they vary in the relative convexity of the larger and smaller valves, 

 as stated by Vicomte d'Archiac. The shell-surface shows lines of 

 growth, and the characteristic well-developed granulations. The 

 smaller valve shows the dark line, indicating the median septum. 



The largest specimen that we have from Shenley measures in 

 length, 17 millimetres : in breadth, 15 mm. ; and in thickness, 

 10*5 mm. 



Kingena Newtonii, nobis. (PI. XVIII, figs. 5a-6c.) 



Shell elongated pentagonal, the length exceeding the breadth. 

 The greatest breadth occurs about the middle of the shell, whence it 

 curves towards the nearly straight, wide front-margin ; the greatest 

 thickness is about the centre of the shell. The shell-surface is 

 granular, exhibits faint radiating striae, and shows concentric lines 

 of growth. The larger valve is considerably more convex than the 

 smaller one ; it has its maximum thickness about the centre, from 

 which it slopes in all directions towards the margin of the shell ; 

 the lateral margin is curved from the greatest width of the valve 

 towards the front-margin, which is nearly straight, only showing 

 a very slight curve ; the curve is rounded towards the beak. 

 The beak is short, recurved, and truncated by a moderate-sized 

 foramen ; the beak-ridges are concave. The deltidium is wide and 

 shallow, and is in two pieces ; this is difficult to observe in many 

 specimens, owing to the friable condition of the shell near the 

 beak. The smaller valve is much less convex than the larger valve ; 

 the greatest thickness is near the centre of the shell, from which 

 it is laterally compressed towards the front-margin ; the greatest 

 width occurs at about one-third of the length of the shell from 

 the posterior end, whence it curves towards the nearly straight 

 front-margin, giving an irregular pentagonal shape to the valve ; 

 the hinge-line is slightly curved. There is a dark line, indicating 

 the presence of a median septum, and showing that the species 

 had a long loop. 



The smaller specimen, which is probably the young of the 

 species, has the same irregular pentagonal shape, straight front- 

 margin, shell-structure, and apical angle ; but the smaller valve is 

 less laterally depressed, the beak is less recurved, and the deltidium 



