W oodward— Crustacean Teeth. 808 
IJ. ON some CrustacEAN TEETH FROM THE CARBONIFEROUS AND 
Uprrer Luptow Rocks or SCOTLAND. 
By Henry Woopwarp, F.G.S., F.Z.S. 
[Plate XI. ] 
T HAVE lately received, from Mr. James Armstrong of Glasgow, 
some very beautiful examples of the detached teeth of Dithyro- 
caris from Lanarkshire and Renfrewshire, and also specimens of 
Ceratiocaris from Lesmahagow (the latter collected by Mr. J. Sli- 
mon); and they seem to possess so much interest, that a description 
of them will doubtless be welcome. 
So long ago as 1843, the late General Portlock (at that time a 
Captain of Royal Engineers conducting the Geological Branch of 
the Ordnance Survey of Ireland), in his Report on the Geology of 
the County of Londonderry, figured the teeth of Dithyrocaris in 
pl. xii. fig. 6, of that work; and at p. 315 he observes, ‘ Fig. 6 repre- 
sents bodies which are frequently found on the specimens of this 
crustacean, and in this instance together, as represented in the 
figured specimen; they each exhibit a single row of tubercles, and 
were in all probability connected with the masticatory apparatus, 
which it is probable, therefore, was highly developed in this large 
species.’ We reproduce the figure in our plate (Pl. XI. fig. 8). 
Mr. Salter first noticed the teeth of Ceratiocaris in 1860,* but 
they have never been properly figured, nor does the figure of the 
- teeth of Dithyrocaris from Ireland, given by Portlock (see Pl. XI. 
fig. 8), correctly represent these organs. 
Plate XI. fig. 1, represents a perfect carapace of Ceratiocaris, at the 
anterior end of which (at a) the two opposing mandibles may be 
seen in their proper place, compressed on the surface of the left 
valve. A detached mandible (fig. 2) from the same locality as 
fig. 1 (Upper Ludlow Rock, Lesmahagow, Lanarkshire) is repre- 
sented in the plate of the natural size.t Figs. 8-6 represent the 
teeth of Dithyrocaris collected by Mr. James Armstrong and Mr. J. 
Bennie from Campsie and East Kilbride, Lanarkshire, and Orchard 
Quarry, near Thornliebank, Renfrewshire. 
Mr. Armstrong (being a practical geologist) was not satisfied with 
General Portlock’s opinion that these detached teeth belonged to 
Dithyrocaris, especially as neither Professor M‘Coy, who had figured 
Dithyrocaris (see Plate XI. fig. 9), nor Dr. Scouler (the original de- 
seriber of the genus), had attempted to connect them: he wished to 
find a specimen with the teeth attached. 
At length, after diligent search, Mr. Bennie was so fortunate as to 
obtain, at Lickprivick Quarry, East Kilbride, Lanarkshire, a por- 
tion of a carapace (Pl. XL. fig. 6), upon the under side of which he 
discovered the long-looked-for teeth in sit&@ (fig. 6, a, 6). This 
* See Annals and Mag. Nat. Hist., 3rd series, vol. y. p. 153. 
{ These specimens are in the British Museum. ss 
t Copied from Prof. M‘Coy’s Carb. Foss. Ireland, pl. xxiii. fig. 2. 
VOL. II.— NO. XV. DD 
