Fie. 
1—7. 
8—13. 
14. 
15, 16. 
Nie 
18. 
19, 20. 
21 
Mp). 
23—25 
26. 
Di, PAshe 
29. 
30. 
Silerowe 
PLATE XXIV. 
SILURIAN SPECIES. 
Rhynchonella nucula, Sow. 1. After the original figure in the ‘ Silurian System :’ Upper Ludlow ; 
Radnorshire. 2. After the original specimen of Terebratula pusilla, Sow. ; 
Lower Llandovery ; Cefn-Rhyddan. 3. After Salter’s figure in ‘ Siluria,’ 
2nd ed., p. 250. 4. Cast ; Upper Llandovery ; May Hill. 5. Davidson’s 
Terebratula Pomelii; Dudley. 6. After Mr. Salter’s figures of Rhyn. 
semisulcata. 7. The specimen named Rh. obtusiplicata by Salter in the 
Geological Survey Museum; Upper Llandovery ; Worcester Beacon. 
3 Llandoveriana, Dav., = serrata, M‘Coy. 8. After M‘Coy’s original figure; Boocaun, 
Cong, Ireland. 9. From Lettershanbally. 10. Internal cast of ventral 
valve; from Outerard; 10 a. Enlarged. 11. From Shanballymore. 
12. Upper Llandovery ; Damory Bridge, Tortworth. 13. From Letter- 
shanbally. 
Weaveri, Salter, MS. Upper Llandovery ; Long’s Quarry, Tortworth. Museum 
of the Geological Society. 
n tripartita, Sow. 15. After Sowerby’s original figure. 16. From a gutta-percha 
impression of the same specimen. Golengoed, in Lower Llandovery. Mus. 
Geol. Soc. 
55 neglecta, Sow. After the original specimen. Upper Llandovery; Llandovery. 
Mus. Geol. Soc. According to Messrs. Phillips and Salter, this is the same 
as Rh. nucula. 
‘5 Thomsoni, Dav. 18. Natural size. 18 a, b,c. Enlarged. Caradoc; Craig Head 
Quarry, Girvan, Ayrshire. 
Es Salteri, Dav. 19. Caradoc; Penwhapple Burn, Girvan, Ayrshire. 20. Boduan, 
Caernarvonshire. Mus. Geol. Survey. 
rat emula, Salter, MS. Caradoc; Chair of Kildare. Mus. Geol. Survey. 
eid Beltiana, Dav. Upper Silurian; Cahireconree. Mus. Geol. Survey of Ireland. 
mt Portlockiana, Dav. Caradoc ; Chair of Kildare. 24. Mus. Geol. Survey. 
» ! nana, Salter, MS. Caradoc; Tyrone. Coll. of the late Mr. Wyatt-Edgell. 
ane Edgelliana. Near Fairfack, Llandeilo, Wales. Coll. of the late Mr. Wyatt-Edgell. 
Triplesia? Maccoyana, Dav. Brynbedwog Quarry, near Bala; in Bala Limestone. = Hemithyris 
depressa, M‘Coy, not of Sow. Woodwardian Museum, Cambridge. 
Atrypa’ incerta, Dav. Upper Llandovery; Penhill, Ayrshire. Hunterian Museum, Glasgow. 
Triplesia Grayie, Davy. Caradoc ; Craig Head Quarry, Girvan, Ayrshire. 31. In the Hunterian 
Museum, Glasgow. 
