368 MB. E. S. COBBOLD ON THE [vol. 1. ' 



LePEBDITIA (?) DEEMATOIDES Walcott (?). 



Leperditia (?) dermatoides Walcott, 1890. lOtli Rep. U.S. Geol. Surv. p. 626 & 

 pi. lxx, figs. 1-1 a. 



A single imperfect specimen [RR 1285] in the Geological 

 Survey collection differs from L. (?) lentiformis in having a punc- 

 tate test; it is also somewhat more convex and elongate. In these 

 respects it simulates Walcott 1 s species. 



Locality and horizon. — Comley, Lower Cambrian; from the 

 Strenuella Limestone, horizon Ac 4 . 



Escasona Matthew, 1902. 

 Escasoxa (?) spp. indet. (PI. XXIV, figs. 47 & 48.) 



Two forms suggest by their shape and convexity a reference to 

 this genus, notwithstanding the fact that there is no sign of the 

 ocular tubercle. 



The two specimens figured [RE, 1332 & RR 1335] are in the 

 Geological Surve} r collection, and are too imperfect for closer 

 identification. They probably represent two species. 



Locality and horizon. — Comley, Lower Cambrian; from the 

 Olenellus Limestone, horizon Ac 2 . 



Bead obi a Matthew. 

 Beadoeia (?) sp. indet. (PL XXI, figs. 28 «-28 c) 



A single specimen [14536] in the British Museum collection 

 appears to belong to this genus. It is an internal cast, with some 

 of the test adhering. In shape it is not xmlike the figures of 

 Ford ilia troyensis Barrande, given by Dr. C. D. Walcott. 1 It has, 

 however, a distinct marginal flat border, ventrally and at the 

 two ends. There is no trace of an ocular tubercle near the hinge- 

 line, but there is a tubercle low down towards the ventral anterior 

 border. The body of the valve is marked with faint concentric 

 lines, both inside and outside. 



Dimensions. — Length = 2 - 5 mm.; width=l"75 mm.; depth 

 = - 7 mm. 



Locality and horizon. — Comley, Lower Cambrian; from the 

 Olenellus Limestone, horizon Ac 2 . 



IX. The Faunas of the Comley Hobizons and theie 

 Oedee of Appeaeance. 



[Table II (p. 376) contains a list of all the fossils described or noted in 

 this paper, together with the tr-ilobites that have been recorded in previous 

 communications ; and also the horizons at which they have been found.] 



The brachiopoda confirm and amplify the principal faunal 

 divisions sketched out by me in 1911 (b, p. 296), and in my reports 

 to the British Association. In some instances they lend consider- 

 able assistance in the correlation of the beds with those of other 



1 1886, p. 125 ; and 1S90, p. 615 & pi. lsxiii, figs. 2. 2 a-2 c. 



