GIO NEW YOIIK STATE MUSEUM 



similar orp:anic associates, is also a Eunoa seems altogether 

 certain. 



This fact leads us to some further comment on the nature 

 of other species of Discinocaris and similar bodies which 

 have been described as phyllocarid Crustacea, but whose nature 

 has still to be satisfactorily demonstrated. 



The organic bodies called Discinocaris, Spathiocaris, Cardiocaris, 

 Pholadocaris, etc. 



These organisms are all thin, chitinous, tenuous, oval, or 

 cordate shields, bearing a deep triangular slit at one end extend- 

 ing back to the apex of the shell, about which the growth 

 lint'S are concentric. These bodies abound at certain Devonic 

 horizons, and some of allied form were early observed by F. 

 Roemer and de Verneuil, who, familiar with the aptychi of the 

 Ammonites in the mesozoic, designated them without attempt at 

 closer investigation, as aptychi of the Goniatites. 



Discinocaris was described by Woodward; and, though 

 its forms, of which a number have been named, are in the fea- 

 tures mentioned above not materially unlike the Devonic ob- 

 jects Spathiocaris and Cardiocaris, they are for the most part 

 from horizons which long antedate the appearance of the gonia- 

 tites. We have shown that one is evidently a brachiopod of 

 large size, but this is one of the most recently described species 

 referred to the genus. 



The genus Spathiocaris was described by the writer. Follow- 

 ing H. Woodward's determination of D. browniana etc. as 

 crustaceans, Spathiocaris (Naples fauna) was also referred to 

 this group of organisms. 



Soon after describing the genus (S. e m e r s o n i ), the writer 

 referred similar bodies from the Devonic at Bicken, West- 

 jdialia, to Spathiocaris and Cardiocaris, regarding them as Crus- 

 tacea. Kayser at about the time of this publication, had 

 discovered and described some of these bodies from Bicken 

 as occurring in, though not well fitting, the body chamber 

 of the goniatite, Manticoceras intumescens. Simi- 

 lar occurrence was noted by Woodward in a goniatite from 



