EXPLANATION OF THE PLATES. 43 
Lianpovery.—Sil., fourth edition, p. 525. Mr. Davidson remarks on this 
species that it occurs in Upper Llandovery or May Hill sandstone only, 
and that it does not appear to be rare, being found, in addition to the 
above locality, at the Obelisk, Eastnor Park ; as well as at the Wych ; all 
three sections being in the Malvern district. Brit. Sil. Brach., p. 39. 
Fig. 3.—LInGULA CRUMENA, Phillips. 
Memoirs Geological Survey, vol. ii., part i., p. 369, pl. xxiv. 
Original, Young and full-grown examples of this variable shell; in coarse, 
gritty, reddish sandstone ; from Howler’s Heath, Malvern district. Mus. 
Gos: I 
LLANDOVERY.—Sil., fourth edition, p. 525. Upper Llandovery, Howler’s 
Heath ; also Pentamerus-conglomerate, {Kinley, Shropshire. Brit. Sil. 
Brach., p. 41. 
Fic, 4.—a, 6, ATRYPA MARGINALIS, Dalman. 
Terebratula imbricata. Sil. Syst., p. 624. Atrypa marginalis, Sil., fourth 
edition, pl. ix., fig. 2. 
a. Original. From impression of external shell. 
b. Original. Internal cast of upper or ventral valye; both specimens from 
Lower Llandovery beds, Llandovery. Mus. G. S. I. 
Carapoc to WENLOcK.—Sil., fourth edition, p. 524. ‘‘ Caradoc, in North and 
South Wales; M.G.S., vol. iii., p. 266; and in Ireland in Bala shales and 
limestone. Lower and Upper Llandovery of many localities, especially in 
the Lower at Rhyader, Llandovery, Mandinam, &c. Upper Llandovery 
at Chirbury, and Llandovery. It is also found plentifully in Wenlock 
limestone at Dudley, Walsall, Wenlock, &c. ; and in the Woolhope lime- 
stones of Malvern, Presteign, and east of Walsall.’”’ Brit. Sil. Brach., 
p- 135. 
Fig. 5.—ATRYPA ? HEMISPHZERICA, Sowerby. 
Silurian System, p. 637, pl. xx., fig. 7. ; 
Original. From a slab of sandstone containing impressions of both valves ; 
external and internal, ? Upper Llandovery, Maume, Co. Galway. Mus, 
Gs. I. 
Lianpovery.—Sil., fourth edition, p. 524. “ This shell appears to be cha- 
racteristic of the Upper and to be more rarely found in the Lower Llan- 
dovery beds; it is exceedingly abundant in certain localities.” Brit. Sil. 
Brach., p. 139. It occurs in the Abberley and Malvern districts at several 
places, as well as in Gloucestershire and Shropshire; also at Wooltack 
Bay in the Marloes district ; Brit. Sil. Brach., p. 139. Additional loca- 
lities for this species in North Wales, &c., are given by Mr. Etheridge in 
the list of Upper Llandovery fossils; Mem. Geol. Surv., vol. iii., p. 361. 
Mr. Davidson also remarks that it is exceedingly plentiful in rocks of the 
Llandovery age, in the Girvan district of Ayrshire. Brit. Sil. Brach., 
p. 139. In Ireland, Professor M‘Coy mentions several localities for this 
species in the county of Galway, at most of which it is very abundant. 
Sil. Foss., Ireland, pp. 39 and 40. 
