RHYNCHONELLIDA. LW iv) 
useless catalogue name had not Von Buch fully described the species in 1834 under the 
same designation. M. D’Eichwald considers RA. diodonta to be distinct from the species 
under description, as well as from RA. didentata ; but in Russia, as well as in Sweden and 
in Great Britain, RZ. diodonta and Rh. borealis occur in the same localities, and merge by 
every gradation of form one into the other. 
Position and Locality. In Great Britain RA. borealis, and its varieties diodonta and 
bidentata, range from the Lower Llandovery to the Upper Ludlow, but are most abundant 
in the Wenlock Limestone. We find it in the Upper Ludlow at Hope End, Frith Pound ; 
Mathon, Malvern district; Hazle, Wonder, Pilliard’s Barn, Stoke Edith, Shucknall, 
Woolhope district ; west of Rock Farm, May Hill district (Phillips and Salter). 
Aymestry Limestone, Russell’s Farm. 
Wenlock Limestone, near Walsall, Dudley, Benthall and Wenlock Edge. East of Can- 
wood and Dormington Wood, Woolhope; Hobbs; Longhope; Abberley, Chirbury 
Malverns, Falfield, &c. 
Woothope beds, Little Hope Woolhope. 
Upper Llandovery. Fron, Coldbrook, Llandovery (var. like fig. 22, Pl. XXI). East 
of Merchlin and Bogmine, near Shelve, North Wales (Survey). 
Lower Llandovery. Priory Mill (Survey). 
In Ireland it has been found in the Wenlock Shales, at Ferriter’s Cove, Dingle, County 
Kerry. Some other localities have also been named by Prof. M‘Coy and General Portlock ; 
but not being quite satisfied as to the correctness of the identification, I need not refer to 
them in this place. It is also probable, though not yet perfectly certain, that this species 
occurs in the Wenlock Shales of the Pentland Hills in Scotland. 
Abroad Rhynchonella borealis, as well as its variety diodonta, occur plentifully in 
the Wenlock beds of the Island of Gothland, these specimens being identical with 
our own. According to D’Eichwald, it would occur in the Coral Limestone of the Island 
of Oécsel, at Hohenheim, Ficht, also in the north of the Ural. It has likewise 
been found in rocks of the Llandovery age in the neighbourhood of Christiania, in 
Norway. 
RHYNCHONELLA DEcEMpLicaTa, Sow. Pl. XXIII, figs. 20—24. 
TEREBRATULA DECEMPLICATA, J.de C. Sow. Silurian System, pl. xxi, fig. 17, 1839. 
Hypornyris — Phillips and Salter. Memoirs of the Geol. Survey of 
Great Britain, vol. 11, p. 280, 1848. 
RHYNCHONELLA — Salter. Siluria, 2nded., p. 544, pl. ix, fig. 15, 1859. 
— — Id. Mem. Geol. Survey of Great Britain, vol. iii, 
p- 278, 1866. 
Spec. Char. Shell small, globose, or slightly transversely oval. Valves moderately 
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