342 MB. E. S. COBBOLD ON THE [voL lxxvi, 



The area ' east of Lawley Hill ' is a continuation of the 

 Comley Cambrian area — the stratigraphical relations to the beds 

 which I have studied are unknown. The horizon is, therefore, 

 lettered Cx. 



LlNGULELLA cf. EEBRUGINEA Salter. 



Cf. Lingulella ferrnginea Salter, 1867, Q.J. G.S. vol. xxiii, p. 340, tig-. 1. 



Cf. Lingulella ferruginea Salter, Walcott, 1912, U.S. Geol. Surv. Mouoajr. vol. li. 



p. 496; pi. xxix,'figs. 1, la-lw, 2, 2«-2/; pi. xxx, tig. 1; pi. xxxi, figs. 3, 



3 a-3 c ; and pi. xxxv, figs. 4, 4a-4 6. 

 Lingulella cf. ferruginea Salter, Matley, 1911, Q. J. G. S. vol. lxvii, p. 300 & 



pi. xxvi, figs. 5-6 6. 



No further evidence as to this form has come to light since 

 Dr. Matley's notes were written. 



Locality and horizon. — Comley, Middle Cambrian ; from 

 the ParadoQcides-riicjiilosus Sandstone and from the JP.-davidis 

 Flags, horizons Bb 4 & Bb->. 



Lingulella sp. indet. 



Lingulella spp. indet., Matley, 1911, Q.J. G.S. vol. lxvii, p. 301, pars. 



Dr. Matley calls attention to another ' small oval form ' found 

 in the Paradoxides-mgulosus Sandstone, horizon Bb r 



0B0LELLID.E Walcott & Schuchert. 

 Obolella Billings. 

 Obolella atlantica Walcott. 



Obolella atlantica Walcott, 1890, Proc. U.S. Nat, Mus. for 1889, vol. xii, p. 3H. 

 Obolella atlantica Walcott, 1912, U.S. Geol. Surv. Monogr. vol. li, p. 589, text- 

 fig. 51 & pi. lv, figs. 1, 1 a-1 i. 



Obolella atlantica is represented at Comle3 r by two forms, 

 which are readily distinguished one from the other, but are so 

 closely allied to Walcott's species that they are described here as 

 varieties. 



Obolella atlantica, var. comletensis nov. (PL XXII, tigs. 

 6-9 ; text-fig. 1.) 



This is the small, round, whitish brachiopod so frequently met 

 with in the Olenellus Limestone of the Comley Quarry. Usually 

 the specimens are very poorly preserved, but occasionally good 

 internal casts and exteriors are to be found. 



The two valves are nearly circular, and have the same degree of 

 convexity. The exterior answers closely to the description and 

 figures given bj Walcott. The interior differs a little from them 

 in the development of the vascular marks ; the size is uniformly 

 smaller ; and the transverse diameter is always a little greater than 

 the length. 



Dimensions. — Length = 3 - 5 to 3"8 mm. ; width = 3"7 to 4 - 

 mm. ; height = "7 to "9 mm. 



Observations. — In well-preserved casts of the ventral valve 

 (figs. 6 & 9 & text-fig. 1), the cast of the pedicle-tube is usually 



