8 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Head Dr. Stimpson remarks: "The abundance of specimens of the 

 it i lav Head indicate a warm climate in that region at the 

 time the] were living. At the present day all Carcinoplacidse arc inhab- 

 itants "i" warn: -. The nearest allied genus. Heteroplax, lives on the 

 coast of China at tlie northern limit of the torrid zone." 



The occurrence of a species of Cancer in the same bed does not nec- 

 trilj tend to prove that the water of the sea on our mioceue coast was 

 DOt somewhat wanner than at present, though not of subtropical temper- 

 ature. There are four species of Cancer on the Pacific coast of North 

 America, where ft magist&r ranges from Sitka to Monterey, O. gracilis 

 from Pllgef Sound to San Francisco Bay, ft prodtictus from Puget 

 Sound to San Francisco, while ft antennariits occurs at San Francisco, 

 .Monterey, and Toinales Bay. I am indebted to Mi— Mary J. Kathbun, 

 -tant in the Smithsonian Institution, for the information that there are 

 no tropical Bpecies of Cancer, and she has kindly sent me the following 

 list of Bpecies of this genus exclusive of those of North America and 

 Europe : — 



' ovae-zelandiae Lucas. New Zealand. 



ft bettianus Johnson. Madeira. 



C.plebeius Poeppig. Chile. 



C. polyodon " " 



C. edwardsii Pell. " 



( '. longipes Bell. " 



ft japonicut Ortmann. Japan 



< '. pygmaeus " " 



('. gibbo8ulu8 (de Haan) " as well as west coast N. America. 



O. amphioetut Rathbun " " " " " " 



Of the two species now living on the shores of southern New England. 



the most ( moti one (ft irrorafaui) ranges from southern Labrador to 



South Carolina, while < '. boreallS is rarer, more local, and has thus far 

 only been found to extend from Nova Scotia to Vineyard Sound and \o 

 M . Land. Loth, then, appear to be on the whole boreal species. 



The invertebrate fauna with which Gancer proavitus is associated 



ha- been enumerated by Dr. \V. II. hall.* of twenty-two species of 



mollusks, about eighl appear to he recent Bpecies ^till living in the waters 



of that region; among them occur Buch boreal forms as Mya arenaria^ 



M. truncate, Toldia limatulay sapotella^ etc., and Dall Btates: 



- on tin- Miocene and Pliocene of Gsj Bead, Martha's vineyard, etc. 

 Amer Jour. Bd Xl.vm . Octobt r. 1894 p 2 



