Vol. 67.] FROM TI1E PAEADOXIDES BEDS OF COMLEY. 285 



rugosities on the doublure appear from Dr. Matthew's figure to 

 correspond in spacing and number with those seen in the Comley 

 species, and the anterior marginal fold is wide and of little con- 

 vexity in both. 



They are sufficiently differentiated by the course of the facial 

 suture posterior to the eye. In Paradoxides regina it is distinctly 

 sigmoidal and extends widely outwards. In P. groomii it extends 

 but little beyond the eye (see PI. XXIII, fig. 4), and in this 

 respect it approaches more nearly to P. bennettii Salter. 1 



The hypostoma of P. groomii differs from that of P. regina in 

 being proportionately wider across the posterior part, and in being- 

 furnished with hooks at the postero-lateral angles. 



The fragments from Comley indicate a length of from 20 to 25 

 centimetres for the complete trilobite, which is about half the 

 length of Dr. Matthew's type-specimen, and of very much the same 

 size as Salter's. 



Locality and horizon. — Comley Quarry, from the conglo- 

 meratic base of the Quarry-Ridge Grits ; also from Neves Castle 

 (Lap worth). 



Paeadoxides spp. indet. (PL XXIY, figs. 1-7 c.) 



From some detached blocks of the material that has yielded the 

 Dorypyge and Conocoryphe described below, I have before me a 

 number of fragments of smaller Paradoxides, which indicate two 

 or three distinct species. 



Locality and horizon. — Comley Quarry, from the conglo- 

 meratic portion of the Quarry-Ridge Grits. 



Paeadoxides davidis Salter. (PL XXIY, figs. 17 a, 17 6, & 18.) 



J. W. Salter, Q. J. G. S. vol. xx (1864) p. 234 & pi. xiii, figs. 1-2 ; and Mem. 

 Geol. Surv. dec. xi (1864) pi. x. 



My collection contains many fragments of head-shields, pleurae, 

 etc., which agree with Salter's species, but do not indicate very 

 large examples of it. The reference is confirmed by the two pygidia 

 [319, 321] which are figured. 



The larger specimen (fig. 17) appears to me to be of the normal 

 form, but the smaller (fig. 18) differs slightly in the shape of the 

 posterior margin between the two points and in the contour of 

 the sides. As has been suggested to me by Mr. Lake, it may be the 

 pygidium of a young individual of the species. 



Locality and horizon. — The upper section on the Shoot- 

 Rough Road, Comley, about 400 yards north-east of the Quarry ; 

 from the ochreous band about 4 feet below the top of the Shoot- 

 Rough-Road Flags. 



■j? j 



Q. J. G. S. vol. xv (1859) p. 553, text-figure. 



