162 



jNIr. J. yV. Salter on 7iew Fossil Crustacea. 



The shape of the carapace is rudely triangular, pointed or 

 rounded in front, truncate and produced behind, and margined 

 along the hinder and ventral edges by a strong furrow. Body 



In this giant Phyllopod, the two lauiin?e (inner and outer 

 surfaces) of the carapace are clearly separable from each other. 

 Both show the coarse reticulation. The anterior end, though 

 evidently attenuated, is not perfect in our specimens ; and I can 

 only provisionally give a restoration of the form at a. A fragment 

 of the surface is added, natural size and magnified, to show the 

 coarse reticulations. 



Fig. 1. Dictyocaris, about j.ih natural size. The body is a restoration. 



Fig. 2. The surface, natural size. 



Fig. 3. Ditto, magnified, external : the aresc convex. 



Fig. 4. Cast of ditto upon the stone : the .area; concave. 



D. Slimoni, n. sp. 



D. magnus, sesquipedalis et ultra. Cephalothorax triangulatus. 

 Segmenta corporis ? 



Locality. Upper and Lower Ludlow rock, Lesmahago, La- 

 nark. Very abundant in the latter formation, but chiefly in 

 fragments. 



Another species (if not more) occurs in the Ludlow rocks 

 of the Pentland Hills, where it was found last summer by 

 myself, in company with A. Geikie, Esq., of the Geological 

 Survey of Scotland. I propose to call it D. Ramsayi. It will be 

 described in the Memoirs of the Geological Survey. 



This genus is more like Nehalia than is Ceratiocaris, inas- 

 much as it has a simply bent, not bivalved, carapace. But 

 without the telson and other parts it cannot be associated with 

 that group, and must for the present be placed near to the 

 Ceratiocaj'idce. 



