H. WOODWARD ON FOSSIL CRUSTACEA, 551 
’ Wetherelli, in memory of my old friend Mr. N. T. Wetherell, F.G.S., 
of Highgate, to whose care and assiduity in collecting and preserving 
the fossil remains of this formation we are indebted for our know- 
ledge of this new Crustacean, 
II. On Necroscilla Wilsoni, a supposed Stomapod Crustacean, from 
the Middle Coal-Measures, Cossall, near Ilkeston. (Plate XXVI. 
fig. 3.) 
I am indebted to Mr, Edward Wilson, F.G.S., of Nottingham, for 
the opportunity of examining this new and very interesting fossil. 
It is preserved in a nodule of clay-ironstone, similar to those which 
haye yielded such beautiful fossils in the Shropshire and Stafford- 
shire coalfields, and from one of which Mr, Wilson obtained (in 
1876) the chelate palpus and five abdominal somites of a Scorpion 
(see Quart. Journ. Geol. Soc. vol. xxxu. pl. viii. figs. 2 & 3, p. 58). 
Although the specimen is only a portion of a Crustacean, consisting 
of the five posterior abdominal somites and the “ telson ” or termi- 
nal segment, yet, from the form of the latter and the presence of 
appendages to the penultimate somite, I venture to think it deserv- 
ing of description. 
The length of the specimen is 21 millimetres, and the breadth of 
the somites 9 mm.; breadth of caudal portion with lateral appendages 
113 mm. Save for a number of minute fractures of the surface of 
the fossil (giving to it what connoisseurs of old china would term a 
‘* crackled ” surface), the specimen is without ornamentation. The 
somites are quadrate; their postero-lateral angles are slightly pro- 
duced ; the fifth somite, or that immediately preceding the telson, has 
its latero-posterior angles emarginate to give insertion to the paired 
appendages on either side. The outer limb (or exopodite) consists 
of three joints :—a short, somewhat triangular, basal or proximal 
joint, 3 millims. long by 2 millims. broad; an oblong median joint, 
4 millims. long by 2 millims. broad; and a semicircular terminal 
palette, 2 millims. long by 2 millims. broad at its straight proximal 
margin, 
The inner appendage (or epipodite) is a much more slender 
appendage than that outside the proximal joint to which it is 
articulated ; it is perhaps composed of two joints. 
The telson measures 6 millims. in breadth at its anterior border, 
where it unites with the penultimate segment; the sides converge 
towards the posterior margin, where it is 4 millims. broad. The 
hind border is produced on the median line into a small blunt pro- 
minence, or tooth, on either side of which it is roundly emarginated, 
to give insertion to two small hastiform spines, which are articu- 
lated to the margin of the telson. ‘Two other fixed spines ornament 
the lateral border of the telson on the outer side of the two movable 
ones. 
I know of only one Coal-measure crustacean which might possibly 
be related to the fossil under consideration : it is the Diplostylus 
