Dr Hrszerr on the Limestone of Kirkton. 281 
hands Dr Hartan’s account of the Eurypterus of North America, to which the 
Kirkton specimens were readily referred 
The Eurypterus is assisned by Dr Hartawn to the class Crustacea; and to the 
order of Branchiopoda. His description of the genus Eurypterus is as follows :— 
Character of the Genus.—* Caput a thorace non distinctum: os ignotum: oculi 
duo, sessiles, distantes, lunati: abdomen elongatum, posticam versus extremitatem 
sensim gracilius, segmentis transversis subimbricatis divisum. Pedes octo; duo 
utrinque antici branchiferi, duo utrinque postici maximi, omnes Jamellosi.” 
Dr Hartay’s specimens were obtained from a “ transition calciferous sand rock” 
of Westmoreland in the Oneida county of New York. He has described two fossil 
species, the Eurypterus lacustris and the E. Remipes. (See Plate XII. fig. 6. and 7.) 
The head of the Eurypterus of Kirkton (see Plate XII. fig. 3.), which differs in 
many respects from the American specimens, exhibits a physiognomy so human like, 
that the quarrymen attributed it to some degenerate offspring of Adam. For this 
reason, as well as in reference to the sort of examination which it seemed to invite, 
the animal might have been stiled the Eurypterus phrenologicus. 
A more suitable specific title is, however, suggested. In honour of the naturalist 
who has described in a satisfactory manner’ the only fragment, namely, the head and 
a small portion of the abdomen, which came under his observation, I propose, to 
name the Eurypterus found at Kirkton, the Euryprerus Scourert. 
I consider the Eurypterus Scouleri to be distinguished from other species, by the 
prolonged eminences intervening between the eyes, which at their apex form an angle 
wherein appears a central tubercle ;—also by the small acutely angular protube- 
rances, like spines, which are diffused over the surface of the head beneath the eyes. 
The character of the feet cannot be given, as no vestiges of them, except very slight 
ones, have turned up *. Perhaps, a last distinction is the greater size of the E. 
Scouleri, which may be learned from the following table of comparison : 
EURYPTERUS LACUSTRIS, EURYEFTERUS REMIPES. EURYPTERUS SCOULERI. 
Larger Specimen. Smaller Specimen. 
Length of the head, 14 inch. 1 inch. 6 inches. 5 inches. 
Breadth of the head, Be ads BAS. 8 vase 63... 
Distance between theeyes,1 —... Bis, 14 s. Paces 
Breadth of the body, ar Be was Bik Dials 
Total length, . De 3}... Wie See 13}? ... 
The Geological Relations of the Kirkton Limestone.—Above this deposit, we find 
beds ef very loose friable shale with ironstone bands, some of which are alternated 
with its upper strata. These shale beds, composed of pure argillaceous matter, ap- 
pear to have undergone few or no alterations from the action of heat. 
* Tn concluding this account of the Eurypterus, I beg to express my best thanks to Dr Simpson 
of Bathgate, for giving me the opportunity of describing the specimens in his possession, as well as to 
Mr Smrru of Jordanhill, for the loan of the specimen in the Andersonian Museum of Glasgow. 
VOL, XIII. PART If. Nn 
