'Mcvision of tlie Nomenclature of the Brachyura. 1G7 



liaps Wcia never used except li}' Oken, the name Thia may 

 properly be used for the crustacean genus. 



Krnussia was used l)y Dana for a genus of crabs,* and liy 

 Davidson for a genus of niolluskst in the same month of tlie 

 same year, May, 1S52 ; but Davidson in 1859 changed his 

 Krans-ua to Kr(iii>isiiia, acknowledging the priority of Dana's 

 genus. 



10. Oiiglaal oiiho(jraj)hij to he preserved except in case of typo- 

 graphical error. — According to Canon XL of the A. 0. U. Code, 

 we should write Ethusa not ^thusa, ^thra not (JiJthra^ Eriocheir 

 not Eriochirus, Podophtahmis not Podophthalmas, Zosiinu.s not 

 Zozymus, Lophozozymus, Steaorynchus, Dorynchus, Loxorynchus, 

 Pyromnia Stimpson, 1S71, not Apiomaia von Martens, 1873. 

 Goneplax Leach, Edin. Encyc, VII, 1814, was spelled Goneplat 

 on p. 393, Goneplax on p. 430. The first form may be consid- 

 ered a typograi)hical error. Goneplax was so used by Leach in 

 1815; in 1816 written Gonoplax; since that time both Goneplax 

 and Gonoplax b}^ different authors. 



*Proc. Acad. Nat. Sci. Phila., VI, 86. 

 t Ann. Nat. Hist., (2) IX, 369. 



