Fie. 
]—4. 
5—9. 
LOS. 
12—20 
21—28 
oy oe 
Orthis 
3) 
ri) 
PLATE XXXII. 
SILURIAN SPECIES. 
ldgelliana, Salter, MS. Upper Wenlock ; Garcoed, near Usk. Coll. 
of the late Mr. Wyatt-Edgell. 3. Interior of ventral valve. 
4. Interior of dorsal valve. 
Tirmantensis, M‘Coy. 5, 6, 7. After Prof. M‘Coy’s original figures. 
Bala Limestone; Aber Hirnant. 8. A small complete 
specimen from the same locality. 9. Internal cast of dorsal 
valve, enlarged. Hurnant. 
simpler, M‘Coy. 10. After the original figure in the ‘Synops. Silur. 
Foss. Ireland.’ Carrickadaggan, County Wexford. 11. 
Interior of ventral valve; 11 a, enlarged. 11 6. Interior of 
dorsal valve, enlarged. Caradoc ; Chair of Kildare. Mus. 
Geol. Survey. 
turgida, M‘Coy. 12—16. After Prof. M‘Coy’s original figures. 
Lower Llandovery Limestone; Llandeilo. 17. Caradoc ; 
Penllech, Ysputty Evan. 18. Penhill, Ayrshire. 19. In- 
ternal cast of ventral valve. 19a. Interior of the same 
valve, enlarged; from a gutta-percha mould taken from 
the cast. 20. Internal cast of ventral valve. 20a. In- 
terior of same valve, made from the cast, enlarged. Penllech, 
Ysputty Evan. 
Berthoisi, Rouault, var. erratica. From pebbles of quartzite of Llan- 
deilo (?) age, Budleigh-Salterton, Devonshire. 25, 26, 27. 
Interior of dorsal valve. 22, 28, 28. Interior of ventral 
valve. From the Collections of Messrs. Vicary and Valpy. 
Valpyana, Dav. Budleigh-Salterton. Coll. of Mr. Vicary. 32a. In- 
terior of dorsal valve. 
