40 CARBONIFEROUS ENTOMOSTRACA. 



It is not common either at Little Island or Settle, whence Messrs. Wright and Burrow- 

 obtained their specimens respectively. The late Rev. J. G. Gumming found it in the 

 Poolvash Limestone, Isle of Man, and presented a specimen to the Geol. Mus. Survey, 

 London, Tablet ^^. Another specimen on the same Tablet came from Longnor, Derby- 

 shire. We have also seen a specimen in the Garboniferous Limestone of Bathgate, Linlith- 

 gowshire, collected by Mr..Grossart, Surgeon, of Salsburg, Lanarkshire. 



2. Cyprella annulata {De Koninck). Plate IV, figs. 12 a, b; \2> a, b ; 17 a, b, c, 



CypkidINA AiiWhAtA, De Koninck, 1841. Mem. Acad. Roy. Belg., vol. xiv,. p. 18, 



fig. 8; 1843, in D'Omalius' Precis 

 elem. Geol., p. 515 ; 1844, Desc. Anim. 

 foss. Terr. Carbonif. Belg., p. 588, 

 pi. lii, figs. 3 a, h. 

 Cytheke — Dupont, 1863. Bullet. Acad. Roy. Belg., ser. 2e, vol. xv, p. 110, 



Cyprella — • Jones and Kir kby, 1864. N. Jahrb. f., 1864, p. 54; Canad. 



Nat. Geol., June, 1864, p. 237. 



Carapace short oviform, truncate and notched in front ; bluntly apiculate and 

 indented behind ; the subcentral tubercle large ; the nuchal furrow variable, stronger in 

 some individuals than in others ; vertical across the valve in fig. 12 a; strongest behind 

 and below the tubercle in fig. 13 «; merely intensifying the back of the tubercle in fig. 

 17 a; deeply notching the back in Prof. De Koninck's figured specimen. Surface verti- 

 cally scored throughout, with about eighteen parallel, sometimes sinuous, lines, with 

 weaker and partial lines between ; and in one interesting case we find a distinct reticulate 

 ornament of minute, polygonal, raised meshes on the shell, traversed by the small parallel 

 furrows above mentioned (fig. 12 b, magnified twenty diameters). 



C annulata (De Kon.), plate 52, 



Length. 



Height. 



Thickness. 



Proportions. 

 Length. Height. Thickness. 



fig. 3 «, (5 (about seven 











millimetres long) . . . 



1 

 3 



1 



4 



. ? 



12 : 9 : ?. 



Fig. 13, from Settle . . . 



i 

 4 



5 



24 



i • 



12 : 10 : 11. 



Fig. 17, from Cork . . . 



1 



4 



1 

 6 



1 



5 



12 : 8i : 9. 



Prof. De Koninck has figured a left valve (fig. 3 a, b), comparable with our fig. 13 a, 

 with its front upwards ; and the artist has introduced an artificial curve, involving the 

 antero-dorsal region and the tubercle, and following the line of the strong nuchal furrow, 

 where it has depressed the dorsal edge. The front margin (upwards) is imperfect, and 

 therefore rounded, as in our fig. 12 a. The convex ventral margin (on the left hand of 



