226 DK. H. WOODWARD ON CKETACEOTJS PODOPHTHALMATA [May 1896, 



Fig. 4. 



add 15 millim. more, making the total length from the rostrum 

 to the posterior border of the cara- 

 pace 50 millim.) ; greatest breadth 

 across the hepatic region 37 millim. 



(No. 2 was collected by Mr. W. 

 Harvey, Comox River, Vancouver 

 Island, 1892 ; No. 3 by Dr. C. F. 

 Newcombe.) 



Carapace smooth and gently convex 

 in front, and very finely and minutely 

 granulated. Latero-anterior border 

 armed with four serrations on each 

 side, frontal border marked by one 

 prominent and one smaller tooth on 

 either side of the small bifid rostrum, 

 while two fissures mark the margin 

 of each orbit. Under surface of 

 carapace not exposed. 



The regions of the carapace are 

 very indistinct ; two slightly divergent raised lines about 5 millim. 

 in length mark the frontal region just behind the rostrum, and 

 there is a faint ridge down the centre of the carapace. A small 

 tubercle on either side, behind the frontal region, marks the 

 epigastric lobe. A faint curved and bifurcating line separates the 

 gastric from the cardiac regions, while two slightly rugose and 

 incised lines curve outward and forward from the central cardiac 

 region, marking the limits of the branchial region on either side. 



Of the several species of Palceocorystes known, the present form, 

 which I have ventured to call P. Harveyi after its discoverer, 

 approaches most nearly to P. Broderijpii from the Gault of Folke- 

 stone, but is probably one-third larger. The latero-anterior border 

 of the former (P. Harveyi) has four spines on each side, whilst 

 P. Broderijpii has only two. The orbital regions differ in form, as 

 well as the markings on the regions of the carapace. 



"We must await more complete materials before attempting a 

 fuller and more careful description ; meantime it is interesting to* 

 meet with a species from so distant a locality which apppoaches so 

 nearly to our own Gault species P. Broderipii. 



Formation. — Cretaceous. Localities. — Hornby Island (No. 2) - r 

 and Comox River, Yancouver Island (No. 3). 



No. 2 belongs to the Provincial Museum, Yictoria, Vancouver 

 Island ; No. 3 belongs to the Geological Survey of Canada. 



Legion Ctclometopa. 

 Family Cancridae. 

 Genus Plagiolophus, Berl- 

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

 the cephalothorax are distinctly marked, front somewhat prominent,, 



