﻿1851.] MURCHISON SILURIAN ROCKS OF SCOTLAND. 171 



Halysites catenulatus, Martini, sp. (Catenipora escharoides, Sil. 

 Syst.). 



Pentamerus oblongus, Sow. 



Orthis calligramma, Dalm., var. virgata ? Sow. 



Leptcena sericea, Sow. 



Murchisonia, an elongated species like M. angustata, Hall. 



Mullock Quarry, above Balquharran (Shelly Sandstone). 



Flattened groups of egg-cases of some Gasteropoda (Pl. IX. 

 figs. 16, 17), very like, if not identical with, a common one in the 

 Llandeilo limestones of South Wales. Sec description (p. 173) at end 

 of the list. It is somewhat like those figured in Sir C. Lyell's ' Manual 

 of Elementary Geology,' 3rd edit. p. 344, fig. 397, from the Old Red 

 Sandstone. 



Illcenus , sp. Pl. IX. fig. 3. This fine species cannot be 



identified either with I. Bowmanni or J. Davisii of the Llandeilo 

 flags ; with the latter it has most resemblance. (Is this J. Rosen- 

 bergii of M'Coy's list ?, — not of Eichwald.) 



Phacops Stokesii, Milne-Edw. sp. (a Wenlock and Caradoc species). 

 Pl. IX. fig. 2. ** 



Calymene Blumenbachii, Brong., from the Red Quarry (C. subdia- 

 demata of M'Coy's list). 



Petraia cequisulcata, M'Coy. ** 



subduplicata, M'Coy. This much resembles P. elongata of 



Phillips. Pl. IX. fig. 7. *** And a variety with more equal 



lamellae. Pl. IX. fig. 8. 

 Heliolites subrotundus, Fougt, sp. (Porites piriformis, Sil. Syst.) 



See p. 144, note. Pl. IX. fig. 9. 

 Favosites alveolaris, Blainv., or Gothlandicus, Lamk. (Sil. Syst.). 

 Ptilodictya (Stictopora ?, Hall) acuta, Hall, sp. ; or this may be Prof. 



M'Coy's P. costellata. I have not been able carefully to compare 



the two. 



Crinoidal stems, one smooth, one tubercled. 

 Orthis reversa, Salter. Pl. IX. fig. 13. **** 



elegantula, Dalm. 



Strophomena pecten, Dalm. sp. 

 filosa, Sow. sp. ? ** 



Atrypa hemisphcerica, Sow., a variety (Hemithyris scotica, M'Coy, 

 MSS.), in which the ribs become more numerous towards the mar- 

 gin. Pl. IX. fig. 12. ***** 



Terebratula. Hemithyris angustifrons, M'Coy, MSS. Pl. IX. 

 fig. 10. ****** 



Avicula , sp. 



Turritella obsoleta, Sow., or possibly a Murchisonia allied to M. 



angustata, Hall. I cannot, however, see any band. 

 Murchisonia cancellatula, M'Coy, Rep. Brit. Assoc. 1850, Trans. 



Sect. p. 107 ; a beautiful reticulate species. 

 Maclurea, sp., a dextral shell. 



Turbo , sp. allied to T. trochleatus, M'Coy. Pl. IX. fig. 15. 



Trochus Moorei, M'Coy? Pl. IX. fig. 14. 



n 2 



