152 BRITISH PALEOZOIC PHYLLOCARIDA. 



PL XXVIII, figs. 3 a, b, Neilson Coll., E. 



Size. — Length 13 mm. ; width at top of the piece 11 mm. 



Characters. — The posterior portion of the left-hand moiety of D. testudinea, 

 magnified to show the characters of its ventral fringe and spine, its mesolateral 

 ridge, and the usual obliquely curved transverse lineation. This has a very- 

 sharp mesolateral ridge. The ventral friuge seems to be broad all the way 

 forward. Gastric tooth in place; and two, separate, in the shale. 



Black shale, non-calcareous. East Kilbride. 



PL XXVIII, fig. 4. Mus. Geol. Survey Scotland, F. f§, No. 10. 



Dithtrocaris testudinetts [ea], Woodward and Etheridge, lb73. Geol. Mag., 



vol. x, p. 482. 



Size. — Length 22 mm.; breadth of the valve, narrowed by lateral pressure, 

 8 mm. 



Characters. — This left-hand half of a carapace, from shale above the Main 

 Limestone (Lower Limestone group) in an old quarry on North Lickprivick l 

 Farm, at the site of Lickprivick Castle, near East Kilbride, was described, but 

 not figured, by Woodward and Etheridge in 1873 (op. cit.). Crumpled and 

 narrowed by lateral pressure, it possesses the usual " raised, oblique, recurved, 

 and divaricating lines" characteristic of D. testudinea. It shows also that "a 

 lateral median [mesolateral] ridge (seen on each side in Dr. Scouler's specimen) 

 marks the centre intermediate between the margin and the dorsal line of the 

 carapace." See page 146, PL XXIV, fig. 7. 



PL XXVIII, figs. 5 a—c. Mus. Sc. and Art Edinb., Coutts, 1887, ff , No. 10. 



Size. — Length of carapace 3G mm. ; width of carapace 30 mm. 



Characters. — This is the cast of a fairly perfect carapace, flattened out. It 

 shows on the inside the impression of the external surface of the original test. 

 This had very delicate, interlinear, sinuous, anastomosing stria?, obliquely 

 transverse to the interspaces; also a minute punctation. The infilling of these 

 little pits of the surface appears in Fig. 5 c as minute pimples. 



Fig. 5 h is a magnified representation of a part of the inturned ventral margin, 

 visible on the right-hand side of fig. 5 a. Compare PL XXVII, fig. 2, in which 

 analogous features, in a fragment of I). tricornis, are seen ; namely, the outside of 

 the straight-lined rim of the inturned margin, which is flattened down on the 

 inside of the fringe. 



From East Kilbride. In black shale, slightly calcareous. 



1 The Lickprivick locality is noticed at p. SO of the ' Catal. Western Scot. Fossils,' 1876. 



