240 BULLETIN: museum of comparative zoology. 



ice are of frequent occurrence. 1 In every case, the marking is typically 

 curved and of lunate pattern, the convex side of the curve heing 

 directed upstream in the one class of markings, downstream in the 

 other. There have yet lacked hoth 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." 2 

 We owe the name " lunoid furrows " to Be 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 south as stated in the " Reports 

 on the Scientific Survey" [of Maine] for 1862, p. 383." 3 His furrows 

 seem to be equivalent with the " crescentic gouges," " jumping gouges," 

 ami "disrupted gouges" of Chamberlin. 



It was not far from Indian Tickle that the present writer also found 

 the luni iid markings for the first time. At Bake Apple Bight on Rodney 

 .Munilv Island, excellent examples were discovered. The lunoid depres- 

 sii his, 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 imequal. The longer one 

 made an angle of from two to twenty degrees with the general surface of 

 the roche moutonnee ; the other, limited above by the convex line bound- 

 ing the marking in plan, made angles of from fifty to ninety degrees with 

 tin' general ledge surface. The furrows or lunes occurred singly and 



i T. C. Chamberlin, U. S. Geol Sur., 7th Ann. Rept, 1885-86, p. 218-223. 



2 The Labrador Coast, p. 298. 



8 J. De Laski, Amer. Jour. Sci., 1864, ser. 2, vol. 37, p. 337. 



