72 CARBONIFEROUS ENTOMOSTRACA. 



Fig. 9, showing the smaller valve, and probably figured with the front end down- 

 wards, is among the specimens from East Kilbride, collected and mounted by the Rev. D. 

 lire, and preserved in the Hunterian Museum, at the Royal College of Surgeons, London. 



Fig. 12 is a view of the larger valve of a Cy titer ella from the Mountain-limestone of 

 Holwell, 1 Somerset, in the collection of the late Mr. Charles Moore, F.G.S., of Bath. 

 The latter is comparable with Reuss's figure of C. complanata, ' Denksch. Akad. Wien,' 

 vii, p. 140, pi. 28, f. 9, but it is longer in proportion. 



5. Cytherella hibernica. Sp. nov. Plate VI, figs. 13 a, b. 



Carapace-valve broad (high), subovate, one edge straighter than the other ; much 

 compressed ; anterior border well-rounded, but rather obliquely ; posterior almost trun- 

 cate. Smooth ; muscle-spot distinct. Profile narrow-lanceolate. 



Length *76; height *44 ; thickness -24 mm. Proportions 19 : 11 : 6. 



This compressed form is in a yellow shale of the Carboniferous Series of Ireland, from 

 Cultra, on Belfast Lough, not far from Holy wood. The locality and its strata are referred 

 to in the 'Mem. Geol. Surv. Ireland, Explan. Sheets 37, 38, and 29,' 1871, pp. 10, 16. 

 Also in the 'Ninth Annual Report Belfast Nat. Field-Club,' 1872, p. 35. 



This Cytherella, associated with Beyrichia multiloba (?) and Estheria tenella, was 

 kindly communicated by Mr. W. H. Baily, F.G.S. It may have been somewhat flattened 

 by pressure, but its relative breadth (height) and extreme compression distinguish it from 

 its Scotch ally C. Benniei, figs. 3 — 5, &c. 



6. Cytherella brevis, Jones. Plate VI, figs. 8 a, b. 



Cytherella brevis, Jones. Monthly Microsc. Journ., vol. iv, October, 1870, p. 185, 

 pi. lxi, fig. 4 ; and vol. x, 1873, p. 75. 



Carapace-valve broadly ovate, short ; compressed, especially in front ; smooth ; rather 

 straighter on one margin than on the other; ends round. 



Length *76 ; height '56 ; thickness "24 ? mm. Proportions 19 : 14 : 6 ? 



Collected by Mr. John Young, F.G.S., in the Campsie district, 2 in a calcareous rock, 

 six feet above the Eurypterus-limestone, Lower Limestone Series. 



1 See 'Quart. Journ. Geol. Soc.,' xxxvii, p. 68. 

 3 'Catal. W.-Scot. Fossils,' 1876, p. 70. 



