Paleozoic Phyllopoda, ete. 199 
Another specimen, belonging to the Woodwardian Museum at 
Cambridge, was long ago figured and described by the late Mr. J. 
W. Salter as probably belonging to a Ceratiocarid. Lastly, an 
enigmatical fossil, possibly belonging to one of the Crustacean 
groups, has been lent by the Owens College, Manchester, and is illus- 
trated in the text. 
1. Peirocarts SALTERIANA, sp. nov. Plate X. Figs. la, 1b. 
This specimen shows two imperfect valves, lying in contact along 
the dorsal sulcus, with a deep semi-oval nuchal notch; and in these 
features corresponding with the genus Peltocaris. The surface- 
ornament consists of strongly-marked subconcentric striz, oblique, 
form in front backwards and inwards, on each valve; and much 
wider apart on the left valve than on the other, possibly from the 
loss of one or more layers of the test. 
Hach valve is partially imbedded at the ends and on the edges; 
and the left valve is broken in front. Pieces of the broken test 
roughen the nuchal space. As this differs from any species which 
we know, both as to shape and the obliquity of the lines of growth, 
we propose to distinguish it as Peltocaris Salteriana, thus naming it 
after the original founder of the genus. 
Fig. 1 is one of the two counterparts, which are dark films of a 
fragmentary carapace, 11mm, long and 7mm. wide, in hard dark- 
grey shale of the Lower Tremadoc series. From a small quarry on 
the stream flowing North from Moel Llyfnant, seven miles 1.8.E. 
of Ffestiniog. Mr. G. J. Williams’ Collection. 
2. ConuLaria (fragment). Plate X. Figs. 2a, 20. 
This obscure specimen has, at first sight, the appearance of two 
imperfect valves or moieties of an Aptychopsis, very acute posteriorly, 
and retaining the attenuated posterior extremity of a nuchal notch, 
at the front end of a dorsal suture. The superficial ornament, how- 
ever, is not at all concentric, but almost uniformly oblique across the 
two moieties of the fossil, and bending in at the central line. This 
sculpturing seems to agree with the markings on the two sides of 
a small imperfectly preserved Conularia. The greatest length of the 
relic is 18 mm. and the width 9mm. 
Fig. 2 is a dark film, on hard dark-grey shale, weathering reddish 
on one face, from Llechwedd Deiliog quarry, about six miles Hast of 
Ffestiniog, on the Ffestiniog-Bala road. Arenig formation. Mr. 
G. J. Williams’ Collection. 
3. Drererocaris Erueripert, T. R. J. and H.W. PI. X. Fig. 3. 
Peltocaris (?), sp. ind., Nicholson and Etheridge. Monograph Silur. Foss. Girvan 
District, Ayrshire, vol. i. 1880, p. 212, pl. 14, fig. 21. 
Dipterocaris Etheridgei, T. R. J. and H.W. Geox. Maa. 1884, pp. 349 and 353 ; 
Brit. Assoc. Report for 1884 (1885), pp. 75, 78, aud 88. 
This little fossil (Fig. 3) shows two ‘“alz,” or wing-like moieties, 
not sutured! together at their narrow junction, nearly semi-circular 
1 « Anchylosed and without hingement,’’ in Mr. J. M. Clarke’s well-preserved 
specimens described and figured in the ‘‘ Amer. Journ. Sci. ser. 3, vol. xxy. p. 121. 
