ARTHROPODA. 853 



of tubercles extend forward, diverging slightly, to the antero- 

 lateral margins of the carapace. 



Remarks. The type specimens of this species, illustrated with 

 the original description of the species, are three in number, two 

 of them being from the Cliffwood clay at Cliffwood Point, and 

 the third from the Woodbury clay at Lorillard. 



Formation and locality. Cliffwood clay, Cliffwood Point 

 (105), near Matawan (189). Woodbury clay, Lorillard (102). 



Geographic distribution. New Jersey. 



