316 



" Genus Plagiolophus, Bell. 



In this genus the carapace is transversely ovate, the regions of the 

 cephalothorax are distinctly marked, front somewhat prominent, the eyes 

 subdistant, superior border of the orbits with two fissures, etc." 



Plagiolophus xancouverensis, sp. iiov. (Figs 15 and 16 on this page ; figs. 5 and (J 

 of the original description.) 



" 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. 



1. Geological Society's specimen 



2. From Comox River, Vancouver Island (fig. 15). 



3. N. W. side, Hornby Island 



4. N. W. side, Hornby Island, (%. 16) 



"No. 1 and No. 2 are \ broader than long, No. 3 is \, and No. 4 is \ 

 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 metabranchial lobes, 

 the metagastric and epibranchial lobes, and the two mesogastric 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, tianked laterally by a small tubercle on each 

 epibranchial lobe ; the lateral border was bluntly dentated. 



Fig. 15. 



*"\ 



Fig. 16. 



0^ 



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

 pace is in parts very finely granulated. 



