240 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
ice are of frequent occurrence.’ In every case, the marking is typically 
curved and of lunate pattern, the convex side of the curve being 
directed upstream in the one class of markings, downstream in the 
other. There have yet lacked both criteria to distinguish the one divi- 
sion from the other and information as to the relative frequency of 
either kind in nature. Consequently, it has been hitherto impossible 
to use these cross-markings extensively as indications of the direction 
of ice-movement. With considerable interest and care the coastal belt 
was examined for light on the question. 
Packard has described and figured the “glacial lunoid furrows ” 
occurring at Indian Tickle just north of Hamilton Inlet. ‘ These 
crescent-shaped depressions, which run transversely to the course of the 
bay, were from five to fourteen inches broad by three to nine inches 
long, and about an inch deep vertically in the rock. Their inner or 
concave edge pointed southwest, the bay running in a general S. W. 
and N. E. direction. They were scattered irregularly over a surface 
twenty feet square. When several followed in a line, two large ones 
were often succeeded by a couple one quarter as large or vice versa.” * 
We owe the name “lunoid furrows” to De Laski, who gave the first 
clear account of them as they appear on the ledges about Penobscot 
Bay. The furrows are there from one inch to four or five feet in 
breadth. “They are lunate in figure, . . . their steep walls invariably 
looking towards the north, never directed sowth as stated in the “ Reports 
on the Scientific Survey” [of Maine] for 1862, p. 383.”? His furrows 
seem to be equivalent with the “ crescentic gouges,” “ jumping gouges,” 
and ‘disrupted gouges” of Chamberlin. 
It was not far from Indian Tickle that the present writer also found 
the lunoid markings for the first time. At Bake Apple Bight on Rodney 
Mundy Island, excellent examples were discovered. The lunoid depres- 
sions, measuring from two to fifteen inches from horn to horn and from one 
quarter to one and a half inches deep in the middle of the curve, pre- 
sented an appearance essentially similar to that described by Packard. 
The two slopes of the depression were always unequal. The longer one 
made an angle of from two to twenty degrees with the general surface of 
the roche moutonnée ; the other, limited above by the convex line bound- 
ing the marking in plan, made angles of from fifty to ninety degrees with 
the general ledge surface. The furrows or lunes occurred singly and 
1 T. C. Chamberlin, U. S. Geol Sur., 7th Ann. Rept., 1885-86, p. 218-223. 
2 The Labrador Coast, p. 298. 
3 J. De Laski, Amer. Jour. Sci., 1864, ser. 2, vol. 87, p. 387. 
