112 BRITISH PALAEOZOIC PHYLLOCARIDA. 



The measurements are | , 16 mm.; — , 15 mm.; A, 10 mm. at 35°; ,_,, 

 11 mm.; I, 5° (?) mm. ; V, 110°; width of carapace to its length, as 30 to 21 

 (about). 



The two counterparts of this specimen occur in dark-grey, hard, shaly flag- 

 stone. Valves, black films. 



Balmangan Bay, west side of Kirkcudbright Bay. Mus. Geol. Survey 

 Scotland. Marked B 135 d ; 2/13/4/92. 



PI. XV, fig. 18, a pair of valves belonging to a small transversely oval cara- 

 pace. The two valves subreniform, having the re-entrant angle between them. 

 They measure, [ , 4-5 mm. ; — , 6 mm. ; Z_, 2 (?) mm. at 45° (?) ; ,_,, 3"5 mm. ; 

 I, 2-5 (?) mm. ; V, about 90°. Proportion of width to length, as 12 to 7 (about). 



Black films in black sub-bituminous shale ; concentrics obliterated. Dobbs 

 Linn. Mus. Geol. Survey Scotland. M 4260 o. 



PI. XV, fig. 23, a subreniform pair of valves belonging to a small transversely 

 oval carapace. Measurements: | , 4 mm.; — , 5 mm.; A, 3 mm. at 30° (?) ; 

 ^_,, 4 mm.; I, 2 mm.; V, about 120°. The notch is half the length of the 

 dorsal suture in depth. Proportion of width to length as 10 to 6. 



In yellowish-grey shale, made up of greenish-grey and buff laminae, very 

 finely micaceous. Valves dark-brown films ; concentrics obliterated. 



Gala group ; Gala Hill, Galashiels. Coll. Lapworth. British Mus. No. 59620. 



X. Genus — Peltocaris, Salter, 1863. 



DiTHYEOCAEis, Salter. Quart. Journ. Geol. Soc, vol. viii, 1852, p. 391. 

 Ceeatiocaeis, Salter. Ann. Mag. Nat. Hist., ser. 3, vol. v, 1860, p. 161. 

 Peltocaeis, Salter. Quart. Journ. Geol. Soc, vol. xix, 1863, p. 87. 



— H. Woodward. Ibid., vol. xxii, 1866, p. 504. 



— — Catal. Brit. Foss. Crust., 1877, p. 77. 



— Nicholson and Etheridge. Monogr. Silur. Foss. Girvan,' vol. i, 1880, 



p. 210. 



— T. B. Jones. Geol. Mag., 1883, p. 462. 



— T. B. J. and H. W. Eeport Brit. Assoc, for 1883 (1884), p. 216. 

 _ _ Geol. Mag., 1884, pp. 349 and 355. 



— — Eeport Brit. Assoc, for 1884 (1885), pp. 76 



and 92. 



— — Monogr. Brit. Pal. Pbyllop., pt. 1, 1888, p. 



— Etheridge. Foss. Brit., vol. i, Palaeoz., 1888, p. 62. 



1 The specimen referred with doubt to this genus at p. 212 (pi. siv, fig. 21) appears to us to 

 belong to Bipterocaris, J. M. Clarke (see ' Keport Brit. Assoc' for 1884 (1885), p. 85 ; probably 

 allied to Pterocaris, Barrande. 



I 



