Vol. 60.] RH^TIC OF THE SOUTH-WALES DIRECT LINE. '2"l 



Schizodus Ewaldi. — Wherever the species is stated we have accepted 

 the determination as correct : we are somewhat doubtful as to 

 the value of the information where the genus alone is cited, 

 and are still more dubious in regard to forms entitled 'Pullastra ' 

 ( Sch hochis). 



Cardium rho-ticum and C. doadnum (? = Gardium sp. of AVilsonj. 

 — These species seem, to a certain extent, to replace each other 

 in relative abundance at different localities. They are, there- 

 fore, best treated together, a course which also eliminates 

 errors of determination. 



IV. Pal.eontological Notes. 



(a) Invertebrata (Molluscaj. By A. V. 



The numerical references in parentheses, throughout the notes 

 on the invertebrata, are to the following authors : — 



(1 ) Moore. C. — Quart. Journ. Geol. Soc. vol. xvii (1861) p. 483 & pis. xv-xvi. 

 2) Quenstkdt, F. A.—' Der Jura' 1858, pi. i. 



(3) Dumortier, E. — ' Les Depots jurassiques du Bassin du Rhone : I. Infra - 



Liasl86f. 



(4) Tehquem, O. — ' L'Etage inferieur de la Formation liasique de Luxembourg 



& de Hettange Mem. Soe. Geol. France, ser. 2. vol. v (1855) p. 210. 



(5) Bbauns, D. — ' Der untere Jura' 1871. 



(6) Portlock, J. E. — ' Beport on the Geology of Londonderry, &c.' l>4.'i. 



(7) Gtoldpuss, A. — • Petrefacta Germanise ' 1826-33. 



(8) Oppel. A.. & Suess, E. — ' Leber die muthmasslicben .Equivalente der 



Kossener Schichten in 8chwaben ' Sitzungsber. k. Akad. Wissensch. 

 Wien, vol. xxi 1 1850) pp. 544 et seqq. & pis. i-ii. 



AffOMiA sp. (PI. XVIII, tig. 1.) 



Upper valve. — Dimensions: vertical = 23 millimetres: hori- 

 zontal:^ mm. (estimated). 



Contour orbicular, with short, nearly straight hinge-lioe and 

 small, slightly-projecting beak : convexity greatest near the beak. 



Shell extremely thin and minutely puckered, with strong con- 

 centric wrinkles. 



Lower valve unknown. 



Since the only specimen that I have seen is this imperfect upper 

 valve, it seems advisable to await more material before assigning a 

 specific name. 



The shell-structure is similar to that of Plaev.nopxis alpina, 

 \Yinkler, as figured by Moore (1) in his pi. xvi, figs. 4-5, and the 

 dimensional ratio is about the same ; but in our specimen the 

 concentric wrinkles are much stronger and the beak and hinge-line 

 different. 



Our species differs entirely from Anomia (?) figured by Quen- 

 stedt (2). in which the transversity is even more marked in the 

 young than in the adult (the first growth-line in Quenstedt's figure 

 has a transversity of ^, whilst in our specimen the young form i> 

 elongated). 



The specimen was obtained from the main Avicula-horizon at 

 Sodburv. 



