372 MILES' GRAPTOLITE. 



which I have designated as Oknus, in the first volume of the Palaeontology of New York, pp. 256-258, 

 Plate 67, Figs. 2, 3. One, the 0. asaphoides, showing six of the lateral ribs of the thorax, has no ribs 

 larger or longer than the others, though the form of the cephalic shield and the glabella are very similar to 

 Barrandia, in that there are four pairs of glabella furrows, the two posterior ones of which are slightly 

 indented across the center of the glabella. The eyes are elongated, and more curved than in Barrandia 

 Thompsoni. We have, therefore, yet another undetermined material in these slates.* 



GEAPTOLITHUS MiLESI. (By PROF. HALL.) 



" Graptolithus Milesi (n. s.) Frond multibrachiate, composed of extremely slender, branching stipes, 

 which are disposed in a bilateral arrangement upon the two extremities of a short, slender funicle (R. R. R. 

 Figs. 2, 3 and 4, Plate XII.), without central disc, radicle short, showing as a minute process on the center 

 of the funicle. Stipes dividing at the extremities of the funicle,and diverging at an angle of from 90 to 

 110, and varying in different individuals or upon the two sides of the same, and again dividing at unequal 

 distances above the base; giving to the best preserved specimens examined, thirty branches to one side of 

 the frond. The bifurcations are irregular, and the number of divisions on the two sides of the frond 

 unequal; stipe and branches slender, almost filiform, moderately flexuose, the angle of divergence of the 

 branches becoming less and less at each successive bifurcation, and the branches becoming more parallel as 

 they recede from the axis. 



The cellules commence immediately beyond the funicle, and are very minute but clearly distinct about 

 thirty to thirty-two in the space of an inch; the outer margin of the cellule makes an angle of about 40 

 with the direction of the axis; and the line of the aperture is about 90 or a little more, appearing as 

 rectangular to the axis. Common body capillary. 



This species resembles the G. flexilis of the Quebec group of Canada (Report upon the Canada Geol. 

 Survey, 1857, p. 119), but is more slender, the branches less flexuous, the cellules smaller and more closely 

 arranged, while the outer edge makes a greater angle with the axis. It differs also in being celluliferous 

 immediately beyond the first division of the stipe a feature not observed in G. flexilis. 



This species differs from all the analogous forms of the Canadian collection, where this type of graptolite 

 was first observed, in its more slender or filiform branches. The collection referred to (See Decade II 

 Canadian Organic Remains) exhibits the gradual development of graptolite forms, from double stipes 

 through the quadribrachiate and octobrachiate forms to those with numerous stipes without bifurcations 

 above the base, and those which in their most extreme development have numerously branching stipes, as in 

 G. Jkxilis and G. rigidus, to which type the species under consideration belong. 



Since the discovery of this type of graptolite in the Quebec or Point Levy rocks in Canada, in 1854, 

 similar forms have been obtained in the shales near Albany, N. Y., and I have been informed by Prof. 

 Swess, of Vienna, that he has identified graptolites from Australia as of similar forms as those he found 

 described in the Canada Geological Report. Plate XIII, Figs. 2 and 3, represent the two specimens of 

 G. Milesi, from which the description is taken. Fig. 4 represents the central portion enlarged." 



Locality. The specimen from which the figures of this species were derived, is part of a bowlder of 

 Georgia slate, picked up in Monkton by Henry Miles, of Monkton. It was discovered almost twenty 

 years ago, but has not been carefully examined before by any Palaeontologist. The counterpart of this 

 specimen was given to Prof. Adams, but it was probably destroyed by the burning of the State House at 

 Montpelier, in 1857. The bowlder was probably derived from the Georgia slate, either in Georgia or 

 St. Albans. 



Fig. 256 represents the trail of an annelid from Georgia. It resembles some of the fossils described by 

 Prof. Emmons. 



Some fucoids have been collected from the Georgia slate, at the trilobite locality, and we have noticed 

 multitudes of others upon slabs of sandstone in St. Albans. They have a generic resemblance to 

 the Palceophycus. 



*We have found, at St. Albans, another genus of trilobite, which is too indistinct to be named. The fact of its occurrence in the 

 eastern part of the group is interesting, because it shows that we may expect to find trilobites in any part of the series. C. H. H. 



