LLANDOVERY GROUP. 
469 
'Em. 546. 
Pentamerus oblongus, Sow. Upper and Lower Llan- 
wick"^ to be at the 
base of the Upper Si¬ 
lurian proper. The 
more calcareous por¬ 
tions of the rock have 
been called the Penta¬ 
merus limestone, be¬ 
cause Pentamerus oh- 
longus (Fig. 546) is 
very abundant in 
them. It is usually 
accompanied by P, 
( StricMancUnia) lirata 
(Fig. 547); both forms 
have a wide geograph- ' dovery beds: 
ical rano*e beino** also 'V'iews of the shell itself, from figures in Murchi- 
^ ’ ,1 ® son’s Sil. Syst. c. Cast with portion of shell re- 
met With in the same « maining, and with the hollow of the central sep- 
i-sQvl tVia f^ilnrion qo him filled with spar. d. Internal cast of a valve, 
pai I 01 LUe OliUl lan se occupied by the septum being rep¬ 
lies in Kussia and the resented by a hollow in which is seen a cast of the 
United States. 
About 228 species of fossils are known in the May-Hill 
division, more than half of which are Wenlock species. They 
consist of trilobites* of the genera II- 
Icenus and Calymene ; Brachiopods of 
the genera Orthis^ Atrypa^ Leptmna^ Pen- 
tamerus^ Strophomena^ and others; Gas- 
teropods of the genera Turbo^ Murchi- 
sonia (for genus, see Fig. 567, p. 479), and 
Bellerophon ; andPteropods of the genus 
FIs. 54T. 
Fig. 548. 
C onularia 
Slricklandinia {Pentamerus) The Brachio- 
Urata, Sow. pods, of which 
there are 66 species, are almost all 
Upper Silurian. 
Among the fossils of the May- 
Hill shelly sandstone at Malvern, _ 
'Ientaeulites ann'iclatus (Fig. 548), TentacuUtes annulatus, Schlot. In 
an annelid, probably allied to Ser- 
pula^ is found. 
Lower Llandovery PocJcs, —Be¬ 
low the May-Hill Group are the Lower Llandovery Rocks, 
which consist chiefly of hard slaty rocks, and beds of con¬ 
glomerate from 600 to 1000 feet in thickness. The fossils, 
which are somewhat rare in the lower beds, consist of 128 
known species, only eleven of which are peculiar, 83 being 
* 1853. Quart. Geol. Journ., vol. ix., p. 215. 
terior casts in sandstone. Upper 
Llandovery, Eastnor Park, near 
Malvern. Natural size and mag¬ 
nified. 
