130 PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



The Raeiiip formation of Mifhisan is an extension of the formation in Wis- 

 consin which James Hall designated as the Racine limestone. The formations 

 in Ontario, which are thought to be included in the Racine, are the Guelph 

 and the thick-bedded, white to very light gray dolomite at the top of the Lock- 

 port of Cockburn and Manitoiilin islands. 



Following- Mr. Ehler's paper was an account by Dr. Roy L. Moodie of 

 his recent researches in paleopathology. This paper, which was illus- 

 trated by lantern slides, was supplemented by a demonstration later of 

 specimens and microscopic preparations in an adjoining laboratory to 

 those interested. 



8TATU8 OF OUR KNOWLEDGE OF ME80Z0IC PATHOLOGY 

 BY ROY L. MOODIE 



{Ahstract) 



This paper discusses the degree of progress disease made during the Meso- 

 zoic. Fifteen pathological results, classified vuider the following tive headings, 

 will be described: 1, Arthritides ; 2. Tumors; 3, Necroses; 4, Hyperostoses; 

 5, Fractures. 



An account of the small fossils obtained by washing the Devonian, 

 shales of Iowa followed, and was presented by the author, with illustra- 

 tions by lantern slides. 



SMALL FOSSILS FROM THE LIME CREEK SHALES 

 BY A. O. THOMAS 



{Abstract) 



At the last meeting of the Paleontological Society the writer reported the 

 finding of dissociated plates, spines, and parts of the lantern of three Devo- 

 nian sea-urchins from the Lime Creek shales of Iowa. Since then quantities 

 of the marly shales in which these occur have been screened and then washed 

 through a series of fine-meshed sieves with the purpose of trying to find am- 

 bulacral plates and other small parts of the dissociated tests. In tliis manner 

 many of the small parts of the echinoids were secured and, in addition, some 

 ostracod valves and a few foraminifera. This led to more screening and wash- 

 ing from several horizons witk excellent results. Bolting cloth was used to 

 catch some of the very finest material. The small forms \yere then sorted out 

 of the dried screenings under a Zeiss binocular. 



In the coarser siftings examined occur a few of the larger forms mentioned 

 below; also some juvenile brachiopods, fragments of shells and bryozoa, bits 

 of coral, pieces of spines, and plates of sea-urchins, and various other broken 

 organic remains. 



The finer siftings, however, yield the best results. At several horizons the 

 commonest fossils are the spirally marked, spheroidal bodies of doubtful atfini- 



