M. J. Bathhtm — Fossil Grab from Port Townsend. 345 

 Branchioplax washingtoniana, sp. nov. 



Type-locality. — Port Townsend, Washington ; late Tertiary. 



Holotype. — Dorsal view of a single specimen exposed in 

 nodule. Cat. No. 195, Yale University Museum. Presented 

 by Dr. Thomas T. Minor, in 1873. A plastotype or cast of 

 the holotype has been made by Dr. II. S. Bassler for the United 

 States National Museum ; Cat. No. 167203. 



Measurements. — Approximate. Length of carapace 28, 

 width of carapace 30*7, width of front between the orbits 10*8, 

 fronto-orbital width 17'4, width between the two branchial 

 regions 3'5, length of that part of the merus of the right or 



larger cheliped which shows outside the carapace 7, length of 

 carpus 8, width of carpus 8*7, length of palm along upper 

 margin 11*4, length of dactylus (perhaps an underestimate) 8, 

 length of palm of left or smaller cheliped 6 mm. 



Of the regions of the carapace, the branchial are the most 

 prominent and are deeply separated from the cardiac ; the 

 narrow part of the nasogastric region is bordered by broad, 

 smooth furrows, and is acuminate ; from it a very shallow 

 median furrow may be seen leading to, but not crossing, the 

 slightly arcuate upper margin of the front ; the middle part of 

 the mesogastric region is faintly outlined ; a broad and deep 

 transverse depression between gastric and cardiac regions ; 

 hepatic regions distinctly outlined. A shallow, oblique furrow 



