REPORT OF THE STATE PALEONTOLOGIST 1901 439 



form. The characteristic graptolite constituents of the fauna 

 -are Diplograptus pristiniformis, D. inutilis, 

 Trigonograptus ensiformis, Cryptograptus 

 antennarius, Retiograptus tentaculatus, 

 Dictyonema, four new species belonging to the rare , sub- 

 genus Desmograptus, hitherto represented by but a sin- 

 gle species in America. This association of forms which is made 

 strikingly distinct by the introduction of the diprionid element 

 appears to be identical with one mentioned by Prof. Hall as 

 occurring at Point Levis, and which is correlated by Gurley in 

 his list of the North American graptolites with the upper Beek- 

 mantown horizon. Thus the zones which have elsewhere been 

 Iheld to represent lower, middle and upper Beekmantown hori- 

 zons are here exposed in continuous section. It is hoped that 

 a more extended study of these beds will furnish the data for an 

 exact determination and subdivision of the graptolite horizons 

 throughout the Beekmantown formation, and it is also purposed 

 to present a careful paleontologic study of the graptolites them- 

 selves. In the appendix to this report Dr Ruedemann analyzes 

 the section in greater detail and also gives under separate title 

 ;an account of the development of one of the graptolite species, 

 tjoniograptus thureaui. 



Monroe mastodon. Late last season my attention was called 

 to the discovery of mastodon bones which had been made some 

 time previously near the village of Monroe, Orange co., on land 

 belonging to Martin Konnight. On visiting the spot, it was 

 ascertained that the bones found were in the possession of 

 iGeorge Konnight of Monroe and had been taken some years ago, 

 while drawing muck from a pond bottom which had been ex- 

 posed by a protracted season of drought. All the bones ob- 

 tained at that time had been kept together with care by Mr 

 IKonnight. The situation at Monroe was as follows. Just be- 

 low the village at the north side of the highway leading to 

 Turner, lies a pond about 250 feet in diameter containing, at 

 the times of my visits, water to an average depth of 6 feet. On 

 careful study of the topography of the region, it seemed prol}- 



