82 REroisT— 1884. 



III. Pholadocauis, H, V'oodward, 1.S82. 'Geol. Mag.* Dec. 2, vol. l\. 



p. oH8. 



The shield of this Phyllopod is ]iGCuHar, and is dosoribed in careful 

 detail, hic. rit. Its main features aro that two furrows radiate from tho 

 centre backwards, enclosinf^ a narrow triangular space, marked witii 

 parallel radiating lines. Radiating and concentric lines ornament tlio 

 lateral ])ortions of the carapace. In front of the centre two slightly 

 raised elliptical ridges enclose a small space behind the apex of the large 

 V-shapod nuchal suture, and in the fig. 16 remind us of the two forward 

 ridges in L'lKijncaris ; whilst the two furrows behind feebly represent its 

 posterior ridges. 



1. rholaducans Lceu, H. W., 1882. Loc. c!t. pi 9. f. 16. 



The only s{>ecimen described with the above characteristics has a 

 triangular-obovatc, or nearly cuneiform shield ; broadly rounded in front 

 (when complete) ; narrow and rounded behind. Complete, about 34 mm, 

 long; 10 mm. broad at the widest part. Rostral piece about 10 mm. 

 long, and 10 mm. wide in front; slope of notch about 60°. From the 

 Upper Devonian of Biidesheim in the Eifel. 



2. Plioladocarin, sp. Aiihjchus of a Goniatitc, F. A. Roemer. ' Palaeon- 

 tographica,' vol, iii. 1850, p. 88, pi. 13, fig. Vi. 



Tliis neat figure of an obovate, notched, concentrically marked, black, 

 filmy fossil from the Goniatiten-Schichtcn of Altenau, in the Hartz, would 

 serve for some Dlsn'nnrnris, if it were not that the posterior portion is 

 marked with a dark (sunken) elongate-triangular space, beginning behind 

 the centre and widening out slowly to the posterior margin. Altogether 

 we may take the figure to represent an ill-pi'eserved Phuladocaris, neatly, 

 tat possibly not quite correctly, drawn. 



Pholadocakis, 



Pholadocans Leeii, (in Goniatitc bed) , , . . Kifel. 

 „ !<p. „ , . . . Hartz. 



IV, LiSGOCARis, J. M, Clarke, 1882. 'Amcr. Journ. Science,' ser. .j, 

 vol. xxiii. p. '\!1S, pi. 0, fig. 5 ; vol. xxv. p. 124. 



This also belongs to the group of fossil Phyllopods which havo 

 shields without a median dorsal suture. It has concentric lines of 

 growth also, following the marginal contour of the test. 



The dil?erenco between this and. Discinocaris is that it has a rounded 

 or elliptically cut cephalic notch (if looked at as wo regard it, instead of 

 posterior or abdominal, as at p. 478, op. cit.) Its outline is symmetrically 

 subpentagonal. Three ridges leave the apex or centre of the shield, one 

 central and one on each side, and radiate to the hinder margin, which 

 they stretch out, as it were, into three points, with two intervening 

 concave spaces. In front two low ridges pass away obliquely forward 

 and outward from the centre, and between them is the long, narrow, 

 round-ended cephalic notch, the shape of which is distinctive. 



1. Lisijocaris Luthcri, Clarke, 1882 Qoc. cit.), is the only described 

 species, and exhibits the features above-given. Its figure is about 40 mm. 

 long and 30 mm. wide ; cephalic notch 10 mm, wide at its entrance, 

 17 mm, long, and not narrowing very much before it begins to curve 

 round at its apex. 



