THE FAUNA OF THE ST. JOHN GKOUP. lOl 



Dimensions. — Length, 13 mm. ; breadth, about 15 mm. 



Locality— 'Sit. John, N.B. Collector, T. C. "Weston. 



This species is intermediate in size between P. Eteminicus and P. Acndicus. It resem- 

 bles the former in the appearance of the glabellar furrows and in the hoUowness of the 

 neck of the glabella, and the latter in the granulated cheeks. 



APPENDAGES OF PABADOXIDES. (Fig. 5.) 



As any facts relative to the existence of appendages in the trilobites arc of importance 

 from their bearing on the question of the position of these creatures in the animal king- 

 dom, I reproduce in the drawings accompanying this article a pygidium incorrectly 

 figured in connection with my former paper. (See Fig. 15, Plate X, Vol. I, Trans. Eoy. 

 Soc. of Canada.) In Fig. 14 of the plate referred to, another pygidium of the same type is 

 figured, upou which a row of scars appears on each side of the axis ; but those on the 

 pygidium reproduced with this paper are more distinct. These scars are somewhat 

 obliquely set on each ring of the axial lobe except the first, and are not far from the median 

 line ; the first pair are nearly circular, but those behind have an oval form. 



If these scars mark the points of attachment of limbs, as seems not improbable, in 

 being so near the axial line they conform more nearly in position to the articulating base 

 of the appendages of Asaphus megistos, as represented by Mr. C. D. "Walcott in " Science," 

 March, 1884, than they do to that of Calymene senaria, figured in the same paper. 



3.— PABADOXIDES MiCMAC. 



In preparing the notes for my former paper, I was a good deal perplexed as to the 

 species to which Prof. Hartt intended to attach this name. In his preliminary notice of 

 the fauna of the St. John group (" Observations on the G-eology of Southern New Bruns- 

 wick," page 30), he says there at least five species of Paradoxides in this formation. At 

 page 656, "Acadian Greology," he speaks of Paradoxides lamellatus as a species occurring with 

 several others ; on the next page. Dr. J. "W. Dawson attaches the name, with doubt, to a 

 specimen in my collection of that period since destroyed by fire, as being probably the 

 species which Hartt distinguished by this name. 



The name was not found attached to any of the Paradoxides in the type-collection of 

 fossils of the St. John group deposited at Cornell University by Prof. Hartt, and yet there 

 are some unpublished species of other genera among these fossils, which have been named 

 by him. Prof. C. D. Walcott, of the United States G-eological Survey, who has examined 

 this collection, and will describe the species contained in it in a monograph on the Cam- 

 brian fauna of the United States, now in press, is of the opinion (and rightly,) that " the 

 species P. Micmac should be thrown out, as not determined by illustration, description, or 

 the preservation of type-specimens." But as the name P. Micmac has gone into geological 

 literature, I would suggest that it be applied to the large species with finely striated 

 glabella, marginal fold, and broad free cheek. (See Fig. 8, Plate X, Vol. I, Trans. Eoy. Soc- 

 of Canada.) This is probably the one figured in "Acadian Geology." 



