THE HAMILTON ASSOCIATION. I43 



with Dr. Johnston Pettit. (I missed the cars by five minutes, and 

 concluded he had gone on by the train. I had to wait for the fol- 

 lowing one.) But it was only after repeatedly hammering on the 

 rocks around me that I heard the three blows signal repeated behind 

 and the lost Professor joined me, accompanied by an old friend, the 

 Doctor, and after a brief consultation we set to work. In three or 

 four hours we had collected about as many specimens as we could 

 carry. 



In the Niagara Shales at Grimsby, there are some thin limestone 

 layers from half an inch to one and a half inches in thickness in 

 which Bryozoons, Brachiopods, Corals, etc., are fairly preserved. 

 The indurated shales also contain many specimens of Stephanocrinus 

 Angulatus and plates of Caryocrinus are very common. We brought 

 away with us some fine slabs of Hall's Fucoid, Arthrophycus Harlani. 

 There are some magnificent specimens of this plant on large masses 

 of white Clinton sandstone. Unfortunately, they are too heavy for 

 removal by the pathway to the quarries. On pointing out a particu- 

 larly fine weathered example, which Dr. Head said would be well 

 worth $50 if we could convey it to Chicago, the professor remarked 

 laughingly " Well, say $60 if we could only transport it to the Wash- 

 ington Museum." Below one of the first quarries opened and partly 

 concealed by the bush, I have found since our visit others that are 

 little inferior to the one in question, too heavy for removal. 



We were sitting on a bank which the Doctor had raised many 

 years ago to prevent the loose slate from sliding down into the ravine 

 and which he removed from above, when he pointed out a particular 

 spot from whence he obtained a fine head of a rare Crinoid (Lyreo- 

 crinas) formerly. While we were listening to the relation, Prof. 

 Schuchert commenced to score the shale by his side with the sharp 

 pick end of his hammer. To our surprise he managed to bring up 

 to the surface a remarkably fine specimen similar to the one men- 

 tioned by the Doctor, who had a little time before obtained for us 

 another Crinoid I do not recollect to have seen figured or described. 

 However, Mr. Pettit recognized it, as well as the curator. Judging 

 from plates and stems there are many Crinoids in the Niagara Shales 

 at Grimsby. It weathers slowly, being protected by the cliff in rear. 



We adjourned in the evening to Dr. Pettit's to see his beautiful 

 collection of Niagara Starfishes, Crinoids, etc. A brittle Star, new 



