108 BRITISH PAL^.OZOIC 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°; 



, ^,4mm. ; 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 : I , 11 mm. ; — , 8 mm. ; _\, 5 mm. at 60°, ^_^, 5 mm. ; I, 6 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 Eldinhope' in the Eldinburn, on the 

 Yarrow, Selkirkshire.^ 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. 68868. 



8. Apttohopsis 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.; 

 _/ , 8 mm. at (?) ; ^_,, 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. xxsiv, p. 280, &c. 



2 Op. cit., p. 282. 



J 



