284 ME. E. S. COBBOLD OK TRILOBITES [Aug. 191 I, 



1 foot above the actual base of the conglomeratic Quarry-Ridge 

 Grits. In some cases these clots pas3 by insensible gradations 

 into the glauconitic sandy matrix, in others they have sharp 

 boundaries as though they were included blocks of pre-existing 

 rock ; but it is possible to collect specimens of the clots with a 

 well-defined boundary on one side, while on the other the calcareous 

 material passes gradually into the sandy matrix. The fossils of 

 the clots, which include Dorypyge, Conocoryphe, Stenotheca, and 

 the Hyolithoid shell, in addition to the fragments of Paradoxides, 

 are also found sporadically in the sandy matrix. I am, therefore, 

 confident that the calcareous clots are of the same geological 

 age as the deposition of the grits. 



Curiously enough, side by side with these calcareous clots, 

 fragments of limestone are to be found, containing recognizable 

 portions of trilobites of the Protolenus-Callavia Fauna and derived 

 from the underlying Lower Comley Sandstone. 



In addition to the type-specimens, a great number of fragments 

 have passed through my hands, but only two of these throw 

 additional light upon the species. These are portions of thoracic 

 segments which fell to the hammer of Mr. W. G. Fearnsides on a 

 recent visit to the locality, and one part of a pygidium which I 

 uncovered on Slab A in trying to develop the margin of the 

 glabella. 



Specimen [1307] x (PI. XXIII, fig. 6) shows that the axial lobe 

 was narrow as compared with the total width of the thorax 

 (apparently the proportion is only a fifth), and that it had a very 

 slight convexity. A second fragment [1308] (PI. XXIII, fig. 8) 

 appears to belong to the posterior part of the thorax, where the 

 falcate extremity is curved backwards to a much greater degree 

 than obtains in [1307] or in [ "B ] (fig. 7). 



The fragment of a pygidium [A.] (PI. XXIII, fig. 9), taken in 

 conjunction with [A 6 ] (not figured), shows that the shield was of 

 the same rounded type as those of Paradoxides bohemicus Boeck 

 and P. tessini L. 



The more noticeable features of the species, so far as at present 

 known, are (1) the general flatness of the whole shield ; (2) the 

 width and slight convexity of the margin of the free cheek and, 

 by inference, of the whole margin of the head-shield ; (3) the 

 pronounced smoothness of the upper surface ; (4) the rugosities 

 of the doublure ; and (5) the comparative narrowness of the 

 axial lobe. 



The species seems to be most nearly related to Paradoxides regina 

 Matthew, 2 which is described as an ' unusually smooth species ' 

 {op. cit. p. 120), but has ' obscure, scattered tubercles ' on the 

 cranidium, which are not seen in the specimens from Comley. The 



1 [The numbers and letters in square brackets are those attached to the 

 specimens. Where numbers alone occur, the specimens are in my collection 

 for the Geological Excavations Committee of the British Association. — E. S. C] 



2 Trans. Roy. Soc. Canada, vol. v (1887-88) sect, iv, p. 119 & pi. iii. 



