70 



CRABS OF FAMILY MAIID.K KATIHUN. 



North Ainoiifa, cxcopt that the iikm-us Joints are rarely as k)!!^- Occa- 

 sional s[>ei'iniens of small size, however, have ;i shorter rostrnni and 

 lissiires narrow or almost closed. Small specimens from the Pacilic 

 coast, while havin,u', as a rule, the orbital li>sures open (this character 

 being" present even auioni;' Stimps:)n's tvpi's), mor.' often exhibit nar- 

 rower lissni-es than do individuals from lMiro])e and Eastern North 

 America. This variation oi' many <»i' the small Pacific forms from the 

 normal type is of no special si^iiilicance, as the same variation occurs 

 even (»n. the Atlantic side. Spe<'imens from (ireenland, three fonit lis 

 of an inch lonu, with iissures very slij>htly open, are identical in form 

 with others of the same size from Ihn-ing- Sea; while it is impossible to 

 sei)arate specimens with open lissures tbund on Geori^es Ihmk fi-om 

 others found north of the Alaskan Peninsula. 



Jjcnjith of lar.uest specinuMi, SO; i>Teatest width, C)-!.."); lenijth of cheli 

 ped, about 14 [millimeters. 



The followini;- tables show theeomi)arative width of the anterior and 

 posterior portions of the carapace in various males from the Atlantic 

 and Pacitic oceans: 



ATLANTIC. 



Locality. 



Grooiilaiul 



Stiitioii 2400 



Avicliiit. Nova Scotia 



TalirMdiir 



Station •J4r>:> 



Slu'tlaiitl 



Oir CaiK- Coil 



Do 



Off Georijcs Hank.... 



Do. 



Off Cai>o x^nn 



Grand Maiiaii 



rACIFlC 



station 3251 



Norton Sound 



Station 3248 



I'lovcrBay 



ISiTini; Si>a {t\\w. i>t' latifroim). 



Plover l?ay. .'. 



Station :!2.''il 



Do 



I'lovor Hay 



Hi'riiig Sea (typo of latit'n»is) . 



rio ver 15a V 



Station 3281 



Station 3288 



Station 3282 



litriim Strait 



Do 



