EXPLANATION OF THE PLATES. 47 
Fig, 3.—a-d. STRICKLANDINIA LENS, Sowerby, sp. 
Atrypa, Silurian System, p. 637.  Stricklandinia, Siluria, 4th ed., pp. 90, 
528; pl. viii, figs. 9-11. Brit. Sil. Brach., p. 161, pl. xix., figs. 13-23. 
a. Internal cast of dorsal valve. From Brit. Sil. Brach., pl. xix., fig. 19. 
b. Internal cast of ventral valve ; from Brit. Sil. Brach., pl. xix., fig. 20. 
Both from Upper Llandovery, Avening Green, near Tortworth. 
e, Ventral valve. From Brit. Sil. Brach., pl. xix., fig. 18. Upper Llan- 
dovery, Norbury, Bishops’ Castle. 
d. Hinge area. From Brit. Sil. Brach., pl. xix., upper part of fig. 15. 
Lianpovery.—Siluria, 4th ed., p. 528. ‘This species occurs in the Lower 
and Upper Llandovery rocks, and is equally abundant in both. Amongst 
Lower Llandovery localities it has been identified from Mandinam and 
other places in the Llandovery district; Priory Mill, Haverfordwest ; 
and other places in Caermarthenshire. In the Upper Llandovery, it 
occurs at Norbury, and other localities in the Malvern district ; and near 
Tortworth ; also at Mandinam, &c., Llandovery; Tre-Coed, Builth,” &e. 
Brit. Sil. Brach., pp. 162, 3. 
Fig. 4.—a, 6. STRICKLANDINIA LIRATA, Sowerby, sp. 
i} v] yf, } 
Spirifer, Silurian System, p. 638. Stricklandinia, Siluria, 4th ed., pp. 90, 
528; Foss. 15, fig. 83. Brit. Sil. Brach., p. 159, pl. xx., fig. 1. 
a. Original. Internal cast of dorsal valve. In sandstone, Upper Llan- 
dovery, Howler’s Heath, Malverns. 
b. Original. Internal cast of ventral valve from same locality and forma- 
tion ; both in Mus. G. S. I. 
Luanpovery and Wentock.—Siluria, 4th ed., p. 528. Upper Llandovery 
or ‘‘ May Hill sandstone,’ Howlers’ Heath, south end of the Malverns; 
N. E. of Chirbury, Nash Scar, Presteign; Llangadoc, S. Wales, &c. 
Woolhope beds, Woolhope ; Wenlock shale, Marloes Bay. Brit. Sil. 
Brach., p. 161. In Ireland it has been obtained from rocks of Llandovery 
age at Carrowkeel, Cong, Co. Galway. Mus. G. S. I. 
H 
