REPORT OF THE DIRECTOR I918 21 5 



These carapaces, in their subrectangular outline and position of 

 the compound eyes in the anterior corners, suggest relationship to 

 the peculiar British genus Slimonia. Similar squarish carapaces 

 with a like position of the compound eyes in the corners have, 

 however, already been described by Clarke and Ruedemann from 

 the Ordovician rocks of New York and have not been found accom- 

 panied by other parts of the body indicative of relationship to 

 Slimonia, such as the telson, and walking legs. It is therefore 

 thought that these carapaces merely belong to a group of Pterygotus 

 of possible subgeneric rank, to be segregated with more complete 

 material. 



Bibliography 



1898 Holm, G. Ueber die Organisation des Eurypterus Fischeri Eichw: M^m. 

 de I'Acad. Imp. Sci. de St P^tersb., ser. 8, v. 8, no. 2. 



1903 Sarle, C. J. A New Eurypterid Fatina from the Base of the Salina of 



Western New York. N. Y. State Paleontologist Rep't, p. 1079. 



1904 Schmidt, F. Ueber die neue Merostomenform Stylonurus (?) Simonsoni 



aus dem Obersilur von Rootzikiill auf Oesel. Bui. Acad. Imp. Sciences 



de St P^tersb., ser. 5, v. 20, no. 3, p. 199. 

 1907 Clarke, J. M. The Eurypterus Shales of the Shawangunk Mountains 



in Eastern New York. N. Y. State Mus. Bui. 107, p. 295. 

 1912 Clarke, J. M. & Ruedemann, R. The Eurypterida of New York. N. Y. 



State Mus. Memoir 14. 

 191 6 Ruedemann, Rudolf. Paleon to logic Contributions from the New York 



State Museum. N. Y, State Museum Bui. 189. 



