64 CONTRIBUTIONS TO CANADIAN PAL.EONTOLOGY. 



Two other fragments are drawn upon the plate, showing in some part a 

 coarse embossing such as appears upon the side of the cephalothorax in 

 the reverse of the original specimen (fig. 6), of which no special mention 

 was made ; by figure 6 it appears that the lateral borders of the cephalo- 

 thorax, outside the supposed lateral eyes, were occupied by a close series 

 of circular or subquadrate abruptly depressed pits (which in reverse would 

 appear as a sort of pavement of elevated bosses) more or less linearly 

 arranged and considerably larger than the supposed lateral eyes. In one 

 of these other fragments they also ajDpear in reverse and are more highly 

 magnified in the illustration (fig. 8), but the fragment is so imperfect and 

 broken that it is impossible to say from what part of the body it comes, 

 and the bosses are seen to vary greatly in size. In another fragment, 

 shown in figure 9, the same are seen as pits upon the surface of a small 

 piece of the test covered otherwise by two other fragments of quite 

 different character and which I cannot regard as in place, since one shows 

 a strongly convex, the other an as strongly concave, surface ; at first sight 

 I thought I had here the fragment of a cephalothorax of different con- 

 struction which bore some resemblance to one side of Peach's figure of the 

 cephalothorax of Uoscorpius injiatus (1. c, pi. 23, fig. 12a), but the rever- 

 sal of the two subtriangular pieces which lie atop the pitted test renders 

 this supposition quite impossible, and indeed makes any attempt to undei'- 

 stand the connection of the two out of question. Both these pitted 

 tests, then, agree so closely with what appears in fig. 6 that there is no 

 reason to suppose we are dealing with another species. 



Mazoiiia sp. 



PI. v., fig. 4. 



Quite otherwise, however, is it with the fragment shown in fig. 4. 

 Here we have a large piece of test, which has the appearance of being the 

 anterior lateral third of a cephalothorax as large as that of figs. 5, 6, and of 

 very much the same contour. It is, however, otherwise totally different, 

 for the whole is very gently and regularly vaulted with no ocellar ele- 

 vation, nor median eyes, the margin followed by a broad and tolerably 

 deep sulcus in which (apparently) are traces of two or three minute semi- 

 globular ocelli ; while the test itself, smooth or nearly so over most of 

 its surface, is distantly punctate in front,* and behind is foveolate with 

 abruptly sunken circular or longitudinally ovate pits of differing size and 

 depth, but in general becoming larger and deeper posteriorly. If this 

 really represents a poi'tion of the cephalothorax of a scorpion, then it 

 probably belongs to a distinct species of Mazonia, for the general form 



*The artist accidentally drew this upside dowai, and the shading required that it 

 should be so placed upon the plate. 



