FI. R. Cowper Reed—Girvan Crustacea, etc. 111 
weaker slit, or rather groove, making a smaller angle with the margin. 
These slits represent short ridges in the interior of the valves. 
Dimensions : 
A. kb. Cc. 
Length ... Bee 30°5 Fae 26-0 sae 15°50 mm. 
Width ... Hoi 13°0 ace 12°0 act 6°25 mm. 
Remarks.—This species differs from P. Lapworthi in the curved form 
of the shell, the posterior part being strongly bent up, and the dorsal 
margin concave instead of straight and apparently not corded. The 
anterior end is also narrower, and the ‘posterior portion relatively 
shorter. The pre-umbonal ridges are a special feature, and suggest 
doubts as to the reference of this fossil to the Crustacea. One of our 
specimens (c) shows both valves of the carapace on counterpart slabs of 
rock, and from it we are able to see that the posterior elongation of the 
shell forms by the juxtaposition of the two valves a narrow laterally 
compressed tube. 
Prynocarts Lapwortut1, Etheridge, jun. 
In addition to some excellently preserved examples of this species in 
the Sedgwick Museum from the type locality Balclatchie, Mrs. Gray’s 
collection contains some from the same beds at Dow Hill and Ardmillan ; 
and another specimen from the higher beds of Shalloch Mill is scarcely 
to be distinguished from this species, but its state of preservation 
makes its determination a little uncertain. 
Drererocaris (?) sp. 
There is one imperfect right valve from Ardmillan in Mrs. Gray’s 
collection which appears to be identical with the form from Penwhapple 
Glen which was described and figured by Messrs. Nicholson and 
Etheridge! as Peltocaris sp., but which Professor Rupert Jones and 
Dr. Woodward? believe may belong to the American genus Dipterocaris, 
Clarke. Apart from the new locality and horizon there is nothing 
further to learn from our specimen. 
SoLENOCARIS SOLENOIDES, Young. (PI. IV, Figs. 8, 9.) 
The fossil described in 1868 by Messrs. Young’ as Solenocaris 
solenoides was referred by Professor Rupert Jones and Dr. Henry 
Woodward* in 1885 to the genus Helminthochiton. The specimens 
figured by these authors, together with some fresh material from the 
same locality, Balclatchie, have been submitted to me by Mrs. Gray, 
and a recently acquired specimen in the Sedgwick Museum has also 
been examined. There would be nothing further to add to the 
description of the species already published if it were not for the 
presence of one important specimen in Mrs. Gray’s collection, which 
shows four consecutive segments of the body (and a trace of a fifth) 
possessing the typical characters (see Woodward’s figure, op. cit., 
pl. ix, fig. 11), but which are followed by a long styliform appendage 
1 Nicholson & Etheridge: op. cit., p. 212, pl. xiv, fig. 21. 
* Jones & Woodward: Mon. Brit. Paleoz. Phyllopoda, p. 112, footnote. 
: 3 Young: Proc. Nat. Hist. Glasgow, vol. i (1868), pt. 1, pp. 171-178, pl. i, 
gs. 7a, b. 
i 4 Jones & Woodward: Grou. Mac., Dec. III, Vol. II (1885), p. 346, Pl. IX, 
Tae ale 
