404 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



fighting or by accident. After the discovery of Apaticlimts holyol-ensis, I was able to 

 point oat several illustrations of the new species at Amherst, which had been over- 

 looked in the preparation of the Ichnology and Sixpplement. 



MUSEUM AT SOUTH HADLEY. 



The Mount Holyoke Seminary and College has taken great interest in Ichnology 

 and possesses an admirable collection. Among the more important ones are the type 

 specimens of Apatichniis holyohensis and of six or eight new species from Wethers- 

 field Cove, besides Anomcepus cuneatus and A. isodactylus from the Dickinson quarry 

 at South Hadley. The data for improved descriptions of Brontozoum divaricatum 

 and Plectropterna elegans are present, as well as long rows of Otozoum moodii, Bronto- 

 zoum gigante^im, and B. approximatum. The slabs occupy a large room in the base- 

 ment of the Lyman Williston Hall, while smaller specimens have been placed in the 

 adjoining apartment. 



The institution possesses several slabs from the Dickinson quarry, about a mile 

 north from the buildings. These are composed of a hard sandstone which jjreserves 

 the impressions and casts with unusual distinctness. The marks of the heels of the 

 hind feet, the front feet, and the tails of Anomcejjus are very plentiful. About sixty 

 species of Ichuozoa are placed upon these tables, and a careful description of every 

 slab exists in the manuscript form. 



This catalogue is like the one prepared by myself in 1S65 for the Amherst 

 collection and printed in the Supplement. 



Of the above species, the ^nigmichnus multiformis is certainly the 

 marking of a drifting tree whose roots or branches trailed in lines strictly 

 parallel along the bottom, these lines often changing to a row of dots or a 

 moniliform line from the rising and sinking of the plant with the waves. 

 These parallel lines cover a space several feet wide and conld hardly be 

 formed by any animal. Further, Professor Hitchcock has omitted a sec- 

 tion of fish-tracks given in the Ichnology with a genus Ptilichnus, or " fin- 

 track," thought by President Hitchcock to be the marks of the fins of fishes. 

 The markings are very uncertain and may well be withdrawn from the list. 

 I have, however, foimd in the collection many fine, thin slabs with a curious 

 marking upon them, which bear the name " Aroid Plants, Sunderland" in 

 President Hitchcock's writing, but about which he seems to have published 

 nothing. The resemblance of these markings to the markings which would 

 be made by the ventral fin spines of a fish drifting slowly backward, and 

 by a few slight rapid strokes stemming the cuiTent at regular intervals, is 

 certainly striking. 



