Vol. 52.] FROM BRITISH COLUMBIA. 227 



the eyes subdistant, superior border of the orbits with two fis- 

 sures, etc. 



4. Plagiolophus vancouverensis, sp. nov. (Figs. 5 & 6.) 



This crab is represented by four specimens, three of which I 

 received from Mr. Whiteaves, and the remaining one is preserved in 

 the Museum of the Geological Society. 



The carapaces vary in size from : — ■ 



Millimetres 



, A 



long. broad. 



1. Geological Society's specimen 22 28 



2. From Comox River, Vancouver Island 



(fig. 5) 20 25 



3. N.W. side, Hornby Island 16 20 



4. N.W. side, Hornby Island (fig. 6) . . 10 13 



No. 1 and No. 2 are J broader than long, No. 3 is J-, and No. 4 

 is J broader than long. 



The frontal border is straight ; the rostrum is bifid, with two 

 small rounded elevations divided by a groove ; the orbital region is 

 smooth and but little indented ; the lateral borders are very gently 

 rounded, the posterior border is nearly straight. The cardiac and 

 metabranehial lobes, the metagastric and epibranchial lobes, and 

 the two nasogastric lobes form three almost parallel lines across the 

 carapace, giving it a very unique linear arrangement ; there are 

 also two much smaller lobes, one behind each of the orbits, flanked 

 laterally by a small tubercle, and a small rounded tubercle on each 

 epibranchial lobe ; the lateral border was bluntly dentated. 



Fig. 5. 



When not waterworn (as in specimen No. 4), the surface of the 

 carapace is in parts very finely granulated. 



These specimens are very distinct, but without more materials I 

 should not feel justified in separating them generically. I prefer 

 rather to place them in Bell's genus PlayiolopJius, which was 

 proposed to receive P. Wetherelli, from the London Clay of Sheppey. 



Q. J. G. S. No. 206. * R 



