Dr. H. Woodward — On Ellqjsocaris D-'wnlquei. 445 



We have then the following characters presented by thes3 Phj'llo- 

 pods : — 



j^ptychopsis (Fig. 3), H. T7oodw. 



a. Carapace divided along the mesial line by a dorsal suture. 



b. Cervical sutui-e rectangular. 

 Discinocaris (Fig. 2), H. Woodw. 



a. Carapace entire, no dorsal suture. 



b. Cervical suture rectangidar. 

 Feltocaris (Fig. 1), Salter. 



a. Carapace divided along the mesial line by a dorsal suture. 



b. Cervical suture semicircular. 

 EUipsocaris (Fig. 4), genus nov., H. Woodw. 



a. Carapace entire, no dorsal suture. 



b. Cervical suture semicii'cular. 



Tjllipsocaris Deioalquei, H. Woodw. gen. and sp. nov. 



Specific Description. — This interesting specimen was obtained by 

 Professor Dewalque from the base of the " schistes de Frasnes," 

 being the lowest stage of the Famennienne series or Upper Devonian 

 sj'stera, at Corablain-la-Tour, in the Province of Liege. 



The carapace, which is elliptical in form, is preserved upon the 

 surface of a slab of pale di-ab-coloured shale, and is 50 millimetres 

 in greatest length, 24 mm. in greatest breadth ; the depth of the 

 semicircular cervical suture is 14 mm. and 12 mm. across the cervical 

 portion. The surface is ornamented by numerous fine concentric 

 lines of growth Jth of a millirnetre apart ; and by a wide irregular 

 network of reticulations. Between the concentric lines of growth 

 the carapace is also covered with very minute transverse wrinkles 

 or vertical bars often bi'anched and inosculating with each other. 

 This ornamentation closely agrees with that seen upon the valves 

 of Estlierice, notably on those of EsiJieria elliptica, Danker (see 

 Mon. Pal. Soc. " Fossil Estlierice" by Prof T, Rupert Jones, 1862, 

 4to. p. 103-4, pi. iv. fig. 7. See also Estheria MurcMsonice, Jones, 

 op. cit. p. 100, pi. iii. fig. 3). 



The concentric striaa have frequently been noticed more or less 

 distinctly in all these Phyllopod shields, but this is the first specimen 

 in which I have seen this delicate transverse wrinkling between the 

 lines of growth. 



I have much pleasure in dedicating this new form under the name 

 of EUipsocaris Bewalqiiei to my friend Prof. G. Dewalque, its dis- 

 coverer. 



I have examined a large number of head-shields of Phyllopod 

 Crustaceans, from the Silurian, Devonian, and Carboniferous, belong- 

 ing to the genera Ceratiocaris, Aptychnpsis, Caryocaris, Discinocaris, 

 and Peltocaris ; and I find that the absence of the small anterior 

 cephalic portion of the shield, in front of the cervical suture, is a 

 common condition in the fossilization of these remains.^ 



As it was to this part of the shield that the muscles of the maxil- 

 lipedes were attached, when the animal died, or (what is of still 

 more common occurrence) when it exuviated, the carapace would 



1 Several specimens in the British Museum have this anterior (cephalic) portion of 

 the carapace preserved in situ, so that it existed in all without any manner of doubt. 



