Vol. 69.] OF THE C0A1LEY BRECCIA-BED. 31 



Comparisons with other Species. 



Paradoxides intermedins simulates the three forms P. hicksii, its 

 variety palpebrosus Linnarsson, and P. sjogreni, in the weakness 

 of the glabellar furrows along the axial line, but differs in the 

 course of the facial suture, and consequently in the general form 

 of the cranidium, and also in the outline of the glabella. 



In both these characters and in the length of the eye-lobe it 

 approaches P. rugulosus and the American allies of that species : 

 namely, P. eteminicus Matthew and P. acadicus Matthew ; but the 

 transverse course of the facial suture and the obsolescence of the 

 glabellar furrows on the middle line at once differentiate it, as also 

 does the shape of the pygidium, if the examples figured really belong- 

 to the same species as the cranidia. 



The proximity of Excavation No. 49 to Comley Quarry, where 

 P. groomii Lapworth is found, and the proportion of 1 : 5 that 

 obtains equally in the thoracic segment assigned 1 to that specie& 

 and in the segment now figured (PI. II, fig. 7), necessitate a 

 comparison between the two species. Both have glabellar grooves 

 that are woak and almost evanescent on the axial lines, and the 

 domes of the glabellas were probably of the same rounded form ; 

 but P. groomii of the Quarry is much larger, it has a very markedly 

 smooth test, a wider hypostoma with the posterior border straight 

 for the greater part of its length, and a very characteristic nether 

 surface to the free cheek. Fragments of this characteristic surface 

 are abundant in the fossiliferous clots of the Quarry-Ridge Grits r 

 and it would indeed be remarkable that they should be absent from 

 the Breccia-Bed, if the two species were identical. 



The form which I have figured " as Paradoxides sp. indet. No. 2 

 resembles P. intermedins in the long and wide eye-lobe, and in the 

 short posterior branch of the facial suture ; the surface-characters 

 of the pygidia are akin though not identical, but their external 

 forms are quite different. 



Locality and horizon. — Excavation No. 49, near Comley 

 Brook : from the matrix of the Breccia-Bed. 



Agraulos Corda. 



Agraulos sp., cf. Arioneeltjs auADRA^GULARis Whitfield. (PI. II, 

 figs. 15a-15c.) 



R. P. Whitfield, Bull. Amer. Mus. Nat. Hist, vol. i (1881-86) p. 147 & pi. xiv, 



fig- 8. 

 C. D. Walcott, U.S. Geol. Surv. Bull. No. 10 (1884) p. 48 & pi. vii, fig. 1. 

 A. W. Grabau, Occasional Papers, Boston Soc. Nat. Hist. vol. i (1900) No. 4, 



pt. 3, p. 674, pi. xxxiv, figs. 9-10 & pi. xxxv, fig. 1. 

 E. S. Cobbold, Q. J. G. S. vol. lxvii (1911) p. 292, pi. xxv, figs. 13, 14, & ? 15. 



Two fragmentary specimens [1395, 1397] are very like the form 

 figured 3 from the Davidis Zone of Comle) r . 



1 E. S. Cobbold, Q. J. G. S. vol. lxvii (1911) p. 284 & pi. xxiii, fig. 6. 



2 Id. ibid. pi. xxiv, figs. 3-6. 



s Id. ibid. pi. xxv, figs. 13, 14, & ? 15. 



