802 DR F. R. C. REED ON THE 



1874. Dinobolus Davidsoni, Salter, Davidson and King, Quart. Journ. Geol. Soc, vol. xxx, p. 161, 



pi. xviii, figs. 6-11. 

 1883. Dinobolus Davidsoni, Salter, Davidson, Mon. Brit. Foss. Brach., vol. v, Suppl. p. 212, pi. xvi, 



fig. 20. 



This species, which has been fully described by Messrs Davidson and King, is 

 not believed by Hall and Clarke * to be specifically distinct from D. Conradi, 

 Hall. No Scotch examples were recorded by Davidson, but good internal casts of 

 both valves and external impressions from Mulloch Hill, and some poor ones from 

 Woodland Point are present in Mrs Gray's collection. 



Horizons. — (l) Mulloch Hill Group ; (2) Saugh Hill Group. 



Localities.— (I) Mulloch Hill ; (2) Woodland Point. 



Genus Rhinobolus, Hall. 



Rhinobolus ? balclatchiensis, sp. nov. 

 (Plate I, fig. 29 ; Plate II, figs. 1,2.) 



Shell transversely subcircular. Pedicle-valve with short pointed prominent 

 beak and high cardinal area having the deltidium, deltidial ridges, and areal borders 

 of nearly the same width ; interior of valve showing broad, very low, not excavated 

 platform, obtusely pointed in front, nearly half the length of the shell ; lateral scars 

 broad, with low median ridge dividing, them posteriorly. Brachial valve without 

 prominent beak ; interior with very low platform, not excavated, with short broad 

 blunt median anterior projection and arched subparallel lateral edges ; anterior scars 

 on projecting tongue ; lateral scars ridged concentrically with edges of platform ; 

 subcardinal scars small and conjoint. Crescent indistinct. 

 < Dimensions. — Length, about 12 mm. ; width, about 15 mm. 



Horizon. — Balclatchie Group (conglomerate). 



Locality. — Balclatchie. 



Remarks. — Only three specimens of this brachiopod are known to me (all in 

 Mrs Gray's collection), and they are not well preserved, so that the above description 

 is necessarily incomplete. In the shape of the platform and its poor development 

 and non-excavation, as well as in the position of the muscle-scars which it bears and 

 in the characters of the cardinal area of the pedicle-valve, we notice a close re- 

 semblance to the Silurian Rhinobolus Davidsoni, Hall and Clarke, t and it is un- 

 doubtedly distinct from Dinobolus Davidsoni (Salter). 



* Hall and Clarke, PalxoiU. New York, vol. viii, 1892, Brach., i, p. 36, pi. ivb, figs. 13-24. 

 + Hall and Clarke, op. cit., Brach., i, pp. 44, 176, pi. ivB, figs. 10-12. 



