148 Proceedings of the Royal Physical Society. 
Fig. 12 is the outline of the parts shown in the fossil, multiplied one and a half 
diameters, to compare with Fig. 13 and outline of the corresponding parts in 
the present-day Nephrops norvegicus. Search was made for the openings of 
the green glands on the bases of the antennz, but without result. 
The chief characteristic of the specimen is the wide marsupium, made 
up of at least six pairs of broad plates or breeding lamelle overlapping along 
the mid-line and completely concealing the terminal plates. The marsupium 
is almost identical with that of the recent Gnathophausia as figured by Sars 
in his “Challenger” Report.1. The specimen also affords additional infor- 
mation regarding the tail and the tail fan, and shows that the telson was 
furnished with a terminal lobe as in the Carboniferous Anthrapalemon and 
the recent Gnathophausia, 
Locality—South Staffordshire Coalfield. 
Horizon.—Coal Measures. 
EXPLANATION OF PLATE. 
Fig. 1. Palewospherotherium walcotti, sp. nov., type specimen, nat. size. Coal Measures, 
Staffordshire. Royal Scottish Museum, Edinburgh. 
» 2. Palewospherotheriwm walcotti. Same as Fig. 1; magnified 3 diameters. 
3. Sphewrothervwm grossum, Koch, nat. size ; outline drawing after Koch. 
5 4. Spherothervwm sp., nat. size ; to show method of rolling of Millipede. Drawn from 
a large recent species from Madagascar. Royal Scottish Museum. 
» 5. Armadillidiwm vulgare, Latr., magnified about 3 diameters, to show method of 
rolling of Isopod Crustacean. 
» 6. Palwospherotheriwm walcottt, magnified diagrammatic view from behind, to compare 
with Fig. 7, 
. Armadillidiwm vulgare, corresponding view from behind, to compare with Fig. 6. 
» 8, Diagrammatic section, dorsites 1-6, along mid-line of rolling Millipede, to show 
mode of articulation to allow of rolling. 
» 9. Paleocaris sp., magnified 2 diameters. Coal Measures, Staffordshire. Royal 
Scottish Museum. 
5, 10. Pygocephalus cooperi, Huxley. Embedded in ironstone nodule. Ventral view, nat. 
size, Coal Measures, Staffordshire. Royal Scottish Museum. 
» Ll. Pygocephalus coopert, Huxley, Counterpart of Fig, 10, 
, 12. Pygocephalus coopert, Huxley. Part of Fig, 10, magnified 14 diameters, to compare 
with Fig. 13, Cross-hatching denotes embedding matrix, Lettering as in 
Fig, 13. 
» 13. Nephrops norvegicus (Linn.), nat. size. Drawing of ventral view of anterior parts, 
to compare with Fig. 12. Recent, from North Sea. 
a, Antennules; A, Antenne ; bs, Basal Scales of Antenne ; 0, Opening of 
“Green” Gland ; m, Mandibles ; mp, Mandibular Palp ; c, Carapace. 
'G. O. Sars, “Report on the Schizopoda,” Voyage of H.M.S. Challenger, pls. iv., v. and 
vi,, 1873-1876, 
(Issued separately, 27th June 1914.) 
