﻿108 



BRITISH PALAEOZOIC PHYLLOCARIDA. 



cracked by pressure ; concentric lines rather broad, but smaller than in fig. 1. 

 Moffat Shales ; Dobbs Linn. Mus. Geol. Survey Scotland. M. 4321c. 



PI. XV, fig. 8. Two valves flattened and separated ; grey films of decomposed 

 pyrites; concentrics rather broad. | , 8 mm.; — , 6 mm.; _A, 4 mm. at 60°; 

 ^,4 mm. ; I, 4 (?) mm. , V,60°. Two valves round-ended sagittate; carapace 

 oval. In dark-grey mudstone, very finely micaceous ; joint weathering reddish. 

 Birkhill Shales, Sundhope Burn. Coll. Lapworth. Brit. Mus. I, 2593. 



PI. XV, fig. 9. Perfect carapace; the specimen described in 1872. Measure- 

 ments : |,11 mm. ; — , 8 mm. ; A, 5 mm. at 60° , 5 mm. ; I, 5 mm. ; V, 60°. 

 The two valves represent a broad-ended sagittate form ; the carapace is oval. 

 Proportion: width 14 to length 16. In a thin dark mudstone, finely micaceous. 

 The valves are black films on a rusty ground ; the concentrics are rather broad ; 

 the rostral piece is present, but has been slightly shifted. 



This is from the Birkhill Shales (upper part of the Moffat Shales, and 

 equivalent to the Llandovery Series) at Bldinhope 1 in the Eldinburn, on the 

 Yarrow, Selkirkshire. 2 Coll. Lapworth. No. 59620, Brit. Museum. 



PI. XV, fig. 22, a small perfect carapace ; the parts very slightly disturbed. 

 Whole length 5 mm. (dorsal suture 4 mm., notch 1 mm. deep) ; breadth of one 

 lateral moiety or valve 1*5 mm., side of the notch 1*5 mm. long at 60°, width of 

 notch 2 mm., angle of notch 60°. Proportion, width 3 to length 5. In a dark- 

 red micaceous shale. Moffat, Dumfriesshire. British Museum. No. 58868. 



8. Aptyohopsis ovata, sp. nov. Plate XV, figs. 4 and 5 ; and Woodcut, Fig. 9, 



p. 109. 



This is apparently a distinct species, being ovate (rather broader behind than 

 in front), smooth, and having a strong marginal rim. 



PI. XV. figs. 4 and 5. These are two ovate or suboval shields, larger than 

 the somewhat similar figs. 9 and 22, and destitute of concentric lines (possibly 

 from the effect of fossilisation). 



Fig. 4 retains the rostral piece, but each valve has been modified by oblique 

 pressure, and shows no remnant of the test. It measures, | , 15 mm. ; — , 10 mm.; 

 _J , 8 mm. at (?) ; ,_ /5 8 (?) mm. ; I, 7 (?) mm. ; V, ?• Proportion, width to 

 length as 20 to 22. The two valves broad and roundly sagittate ; carapace ovate. 

 Shorter than A. Salteri, and with a fuller curve on the posterior third. 



In brownish-grey, hard, micaceous shale ; valves rusty, slightly oblique and 

 imperfect, as is also the triangular piece at the top edge. The outer margin 



1 See ' Quart. Journ. Geol. Soc.,' vol. xxxiv, p. 280, &c. 



2 Or- cit., p. 282. 



