446 F. R. Cowper Reed — Fossils from Haverfordwest. 



(c) Slade Beds. 



Lingida hrevis, Portl. (?). 

 Lingnla, two sp. indet. 

 Crania Grayi, Dav., var. 

 Orbiculoidea perrugata, McCoy. 



,, {PlioUdojis?) oblongata, Portl. 



Orthis vespertilio, Sow. 

 ,, Sowerbyana, Dav. 

 ,, crispa, McCoy. 

 ,, Actonice, Sow. 



,, porcata, McCoy, var. nov. sladensis. 

 ,, testudinaria, Dalm., rar. 

 ,, (several indet. sp.). 

 Triplecia insularis, Schloth. 

 Strophomena antiquata, Sow., var. scabrosa, Dav. 

 ,, expansa, Sow. 



,, mediocostalis, sp. nov. 



sp. 

 Plectambotiites papulosa, sp. nov. 

 Atrypa imbricata, Sow. 

 Meristella cf . crassa, Sow. 

 Hyattella pentagonalis, Eeed (?). 

 Zygospira Sicksi, sp. nov. 



Trematis multistriata, sp. nov. (PI. XXIII, Figs. 1, la.) 

 Description. — Sbell nearly orbicular, a little wider than long. 

 Brachial Talve gently convex, most so towards beak, which is 

 marginal and slightly projects over posterior margin. Surface of 

 valve covered with fine, raised, thread-like lines radiating from 

 the beak, and increasing in number towards margin by interpolation 

 of secondarj' and tertiary shorter lines at half, or a quarter, or less 

 than a quarter the length of the primary lines. All lines of equal 

 strength and at equal distances, the interspaces being about twice 

 the width of the lines. The median lines are straight, but towards 

 the cardinal region the lines curve gently backwards. Interspaces 

 between radiating lines occupied by small transversely rectangular 

 or subquadrate pits, a single row lying along each interspace, and 

 separated by small low transverse bars. The radial threads number 

 on margin about 200. A few low concentric growth ridges are 

 present on the surface. 

 Dimensions. 



Length 16-5niin. 



Width 18-5mm. 



Locality. — Quarry near Church, Lampeter Velfrey. 



Horizon. — Lower Llandeilo Limestone. 



Eemarks. — This beautifully ornamented shell is closely allied to 

 Trematis siluriana, Dav.,' but the radial lines are rather more 

 numerous and closer together, the interpolation of secondary and 

 tertiary lines less regular, the pits less conspicuous, and the beak 

 more marginal. The shell is well preserved in our specimen, but 

 unluckily we know nothing of the internal characters nor of the 

 opposite valve. T. ottawaensis, Billings,^ from the Trenton Lime- 

 stone, appears to be a nearly allied form, but, apart from the 



1 Davidson: Mon. Brit. Foss. Brach., vol. iii, p. 71, pi. vi, figs. 8, 8a, 85. 



2 Billings: Pal. Foss. Canada, vol. i (1862), p. 53, fig. 58. 



