1107 



For the rest llio liiiige line is siraiglit. Along- llic .straiglit jiart 

 the right valve overlaps (he left one. By making sections of complete 

 carapaces (fig. 5) I fonnd (hat the shaj-p hinge line of the left valve 

 lies in a deep furrow of the right one. 



On the other hand the free edges of the right valve are sharp 

 and when (he carapaces are closed, these sharp edges lie in a furrow 

 on the free edges of the left valve. So the left valve overlaps (he 

 right one except along the hinge line (fig. 2). 



In the lower part of the middle-most of the three larger furrows 

 each valve has a round spot indicating the place where the adductor 

 was fastened. 



When I had become better acquainted with Beyrichla hieroglyphica 

 Krause, the resemblance between this Ostracod and BeyrichiaMallii 

 Jones ^) (fg. 6), to which Krause drew the attention, proved much 

 greater than the latter could presume. Another thing that struck me 

 was that in the v^alve represented by Jones as a right one — though 

 in fact it is a left one — the two front lobes also seem to join 

 into a process. In order to see in how far I was right in my supposition 

 I applied to Di-. Bassler, curator of the National Museum of 

 Washington, with the request to send me some material of this 

 Ostracod. This was kindly sent to me and 1 saw that the two 

 anterior lobes on the left valve of Beyridda Hallii Jones indeed 

 unite dorsally into a process, similarly to those in Beyridda hieroglyphica 

 Krause. 



On further examining the literature I found that Ulrich and 

 Bassler ^) had classified Beyrichia Hallii Jones among their genus 

 Kloedenella, of which they call the underdevonian Kloedenella 

 liennsylvanica Jones (fig. 7) a typical representative. 



Then I asked Dr. Bassler to send me some material of this latter 

 Ostracod. In the complete carapace of Kloedenella peimsylvanica, 

 which was then sent me, I found the same characteristic way of 

 connecting the two valves, which is no doubt also found in other 

 Ostracoda, for which the two authors mentioned above have instituted 

 a new genus Kloedenella , for they make special mention of the 

 fact that of most of the representatives complete carapaces have 

 been fonnd. 



^) The Quatérly Journal of the geological Society of London, Vol. XLVI, p. 15, 

 PI. IV. fig. 21. 1889. 



Jones has called this Ostracod B. Hallii and not B. Halli as Krause writes. 



-) NO. 3 64G. — From the Proceedings of the United States National Museum. 

 Vol. XXXV. p. 317. 



