42 



Dr. C. T. Jackson presented to the Society a cast of a 

 very perfect specimen of the Trilobite (Paradoxides 

 Tessini, or Harlani.) mentioned in Prof. Rogers's paper, 

 which was obtained by him from the slate quarry at 

 Braintree, on the 9th of August last. He also exhibited 

 a cast of the specimen referred to by Prof. Rogers, which, 

 from the character of the rock, he thought was undoubt- 

 edly obtained from the same ledge, and which was pur- 

 chased by Mr. Francis Alger, at the breaking up of the 

 old Columbian Museum of Boston, some twenty-five 

 years ago, and was originally presented to that museum 

 by some one residing in this vicinity. 



Mr. Alger's specimen is in a sharj), angulai", prismatic mass of 

 rock, having all the appearances of having been broken from the 

 rocks in place, and certainly was not a boulder. 



From the existence of this specimen, and also from the frequent 

 discovery of fragments of Trilobites in the erratic rocks on 

 George's Island, geologists were prepared for the discovery of 

 them in some of the ledges of this neighborhood, but no one 

 ever thought of looking among the pinched up and metamorphic 

 slates between the Quincy and Braintree Sienito hills for any 

 fossils, until they were actually disclosed by the quarrying opera- 

 tions of the Messrs. Haywood at Braintree ; and one of our 

 members, Peter Wainwright, Esq., recognized them as trilobites, 

 and as subjects of great scientific interest, and called the atten- 

 tion of professed geologists to the locality. 



About five years ago, Mr. Eliphas Haywood first observed 

 these fossils on opening his stone quarry for the purpose of 

 obtaining underpinning and ballast stones. Without knowing 

 their nature, he still looked upon them as interesting curiosities, 

 and laid aside the specimens which have lately been brought 

 before this Society. 



He showed them to Mr. Wainwright, who at once recognized 

 them as trilobites, and brought them to Boston for the inspection 

 of geologists, and presented two specimens to our associate. Prof. 

 Wm. B. Rogers, to whom the Society is indebted for the first 

 notice of these remarkable fossils, so important in the determina- 



