8 TRANSACTIONS OF THE [1888 



ore beds of Mr. J. D. Latchford, near Muirkirk, a second from 

 the vicinity of Hyattsville, and a third from similar clays next 

 the shore of the Patapsco river at the Spring Gardens, south 

 of Baltimore. 



Fine and dressed specimens of all the commercial granites of 

 the State were also present. These included cubes of the stone 

 from Port Deposit, from Guilford, Ellicott City, Woodstock, 

 and from near Granite Postoffice. A large and finely polished 

 example of the so-called Precious Serpentine, from the vicinity 

 of Broad Creek, Harford County, and smaller pieces of the 

 paler green, translucent variety of the same rock, from Cecil 

 County, were added to these series. The collection also em- 

 braced Breccias, well polished, from the quarries in the Triassic 

 sandstone at Mechanicstown, and other varieties of the same 

 rock from the vicinity of Frederick City and from the ledges 

 near Adamstown, in Frederick County. Other marbles of 

 various kinds — some of them unusually rich in color and 

 pattern of marking, of the wine-red, purple, rose-pink, salmon- 

 yellow, black, and white-veined, of several different types of 

 grain — were represented from Carroll, Frederick, and Washing- 

 ton counties. Examples of the flagstones from the South 

 Mountain, near Boonsboro ; also the various sandstones and 

 slates, the white marbles from Baltimore County, and the 

 statuary marbles from the farm of Mr. Rinehart, near Double 

 Pipe Creek in Frederick County, were included. 



The chief reptiles and amphibia, and the shells of mollusca 

 from many parts of the State — terrestrial, fluviatile, and 

 marine — and most of the species of fishes from all the hydro- 

 graphic areas of Maryland and her sea-coast, were present. Like- 

 wise there was a series of the crayfish from many of the rivers, 

 lakes, and estuaries of the State, as represented by five species 

 of Cambarus with their several varieties. Besides the fore- 

 going, there were numerous fossils from the sedimentary 

 geological formations, many of which were collected by Mr. 

 Philip T. Tyson from the cretaceous greensands of Bohemia 

 river and vicinity, on the Eastern Shore, and from both sides 

 of Prince George's County, on the Western Shore. From the 

 same source came also multitudes of fossil shells, with some 



