PACKARD, — A NEW FOSSIL CRAB. 9 



" It will be observed that this is a distinctly northern assemblage ; 

 any of the species might be at home in the waters about Gay Head to- 

 day, as far as we can judge by analogy in the case of extinct species." 



It would appear, then, from the evidence thus far obtained, and taking 

 into account the abundance of Archaeoplax, that the climate of the miocene 

 of Gay Head, or at least the temperature of the ocean, was probably 

 somewhat warmer, but yet not greatly different from what it now is south 

 of Cape Cod. 



