400 Dr. H. Woodward—On a Fossil Schizopod Crustacean. 
LL. Evchwaldi, Nieszk.,’ and LZ. Pahleni, Schmidt,? are also closely 
allied to our Melmerby form. 
In LZ. Evchwaldi the inner portion of the free cheeks is similarly 
swollen and the outer portion depressed, and the median portion of 
the head-shield projects in the same manner; but the pygidium has 
no freely projecting points to the pleure. 
L. Pahleni has straighter axial furrows bounding the glabella, and 
the pygidium is more elongated. The latter species is found in 
D, in the Baltic provinces, and the former in HE. 
L. angusta occurs in F, and F,, and L. deflera in Dy. 
From the above comparison it will be seen that our Melmerby form 
does not completely agree with any of these species, though it shows 
so many points of affinity with all, and it appears necessary to regard 
it as a new species which may be suitably named melmerbdiensis. 
The section to which it belongs is that termed Homolichas by Schmidt * 
and the author,’ and in the latter’s scheme of classification it lies in 
the second main division of the whole genus Zvchas. 
EXPLANATION OF PLATE XVII. 
Fig. 1. Lichas (Homolichas) melmerbiensis, sp. nov. Complete individual. x 2. 
Dufton Shales, near Melmerby. 
ap ee Witton Ditton) S42¢ 
,, 3» Ditto. Thorax and imperfect pygidium. x 2. 
,, 3a. Ditto. Thoracic segment enlarged to show ornamentation. x 5. 
,, 4. Ditto. Posterior portion of middle part of head-shield. x 2. 
», 5. Ditto. Anterior portion of glabella. x 14. 
5 On) Ditto. Pysidium.) )x<p2: 
», 7% Ditto. Hypostome. x 23. 
TV.—On THE cenus Pyre@ocerHALus (Huxiry), A PRIMITIVE ScHIZOPOD 
CRUSTACEAN, FROM THE CoAL-MEASURES. 
By Henry Woopwarp, LL.D., F.R.S., V.P.Z.8., F.G.S. 
(PLATE XVIII.) 
PY GOCEPHALUS COOPERI was first described by Professor 
Huxley from the Coal-measures of Paisley in 1857 (Quart. Journ. 
Geol. Soc., vol. xiii, pp. 363-369, pl. xiii), and a second specimen by 
the same author in 1862 (op. cit., vol. xviii, pp. 420-422, text- 
figure). Some additional specimens came into my hands for exami- 
nation, and were communicated to the Glasgow Geological Society, 
in 1866 (Trans. Geol. Soc. Glasgow, vol. ii, pp. 284-247, pl. in, 
figs. 1-3). In that paper I described a second species, which 
IT named Pygocephalus Hualeyr (text-figure, p. 244, op. cit.). The 
specimens referred to above were obtained from the Coal-measures 
of Paisley, from Kilmaurs, and from near Manchester. Since then 
the late Mr. Henry Johnson, F.G.S., formerly of Dudley, obtained 
1 Schmidt: op. cit., p. 104, t. iv, figs. 10-17. 
2 Schmidt: op. cit., p. 97, t. iv, figs. 6-8. 
3 Schmidt: op. cit., pp. 31, 40, 42. 
4 Reed: Q.J.G.S., vol. lviii (1902), p. 78. 
