1106 



Cjpriden imd Fischresten. Die einzelnen Schalen waren niir in 

 Bruchstücken aus dem Gestein zu lösen. Fig. 10 ist ein erganztes 

 Bild eines der best erhaltenen Exeinplare." 



In order to ascertain whether the remains of Ostracoda which I 

 had found, really originated from the genus described by Krause as 

 Beyrickia hieroglyphica, I looked for similar remains in an erratic 

 boulder consisting of Chonetan or Beyrichian limestone which 1 had 

 found some time ago when a pond was being dug near a villa, 

 called Hilghestede, between Groningen and Haren. This erratic 

 boulder is now in the collection of the Mineralogical Geological 

 Institute of the University of Groningen. I was then fortunate enough 

 to find not only a great number of separate v'alves, but also several 

 complete carapaces. 



This latter erratic boulder is a dark grey somewhat crystalline 

 piece of Beyrichian limestone, in which among other things I found : 

 fish-remains, Kloedenla Wilckensiana Jonks, Beyriclda protuherans 

 Boll, Beyrichia tuberculata Klöüf.m sp. and Leperditia pliaseolus His. 

 The first three fossils had also been found in the erratic boulder in 

 which Krause found remains of Beyrickia hieroglyphica, if at least 

 B. aff. Kloedeni may be identified with Beyrichia protuberans, which 

 seems almost certain ^). 



It appeared to me that the illustration given by Krause represents 

 a left valve, as the posterior of the two litlle furrows is always the 

 bigger one (the anterior may even be absent). This figure, however, 

 is very incomplete, for this author seems to have been ignorant ot 

 the fact that the remains found by him, had only partly been 

 uncovered. Before the anterior lobe there is another sickle-shaped, 

 less convex part and behind the posterior lobe a similar part taj>ering 

 towards the lower end. The narrow inferior ends of the less convex 

 parts meet at the ventral side. 



The lobe along the ventral edge, wiiich joins the other lobes, is 

 nearly straight and not curved, as represented by Krause ; in his 

 description, however, he calls it straight. The ventral edge of the 

 carapaces is concave. 



As the most striking feature of this Ostracod I found, however, 

 that in the left valve the two anterior lobes unite at the top into a 

 process, which lies in a notch of the right valve (figs. 3 and 4). No 

 doubt the great number of complete carapaces which were found, is 

 due to this arrangement. 



^) Wissenschaftliclie Beilage zum Programm der Liiisenstadtischen Oberrealscliule 

 z\\ Berlin. Ostern 1891, Berlin, R. Gaertners Verlagsbuchhan Hung (Hermann 

 Heyfelder). p. 12. 



