Palceozoic Bivalved Entomostraca. 355 



3. Mr. Vine's XLI (bed no. 25), not difFL^-ing from the fore- 

 going except being larger and smoother, that is, mucli less 

 coarsely granulated. Front and hind lobes fully conflaent. 



This variety retains its leading characters among numerous 

 specimens in the Upper-Silurian shales, though the tubcrcu- 

 lation varies in intensity. Mr. Smitli's no. 15 (Severn, Iron- 

 bridge) has one specimen with a subdentate edge, as also in 

 fig. 8a. Occasionally individuals have the "big lobe." 



A fine old individual of var. tuberculafa, Salter (not B. 

 tuberculata, Kloden), is in Mr. John Smith's collection 

 (no. 19), from a yellowish shale in a roadside quarry at 

 Gleedon Hill, between Build was and Much-Wenlock (see 

 Geol. Mag. Feb. 1881, pp. 72 and 74). It was associated 

 with numerous small Brachiopods and Crinoids, some Polyzoa, 

 Conodonts, and minute pearl-like bodies, such as those de- 

 scribed and elucidated by Prof. SoUas (Quart. Journ. Geol. 

 Soc. vol. XXXV. 1879, p. 501, pi. xxiv. figs. 12,_ 17-20). For 

 similar little pearl-like fossils see C. Barrois's ' Terrains 

 anciens des Asturies et de la Galice,' 1882, p. 45, pi. xx. 

 fig. 4 (uppermost figures) , there referred to coccoliths. 



Smith Coll. no. 15. Railway-cutting, side of Severn, Iron- 

 bridge. 



18. Woolhope (figs. 8a,h). 



19, with big lobe. Gleedon Hill, Much- 



Wenlock. 



23. Benthall Edge. 



24, rather variable as to tubercles and mid- 



lobes. Wren's Nest, Dudley. ' 



Vine Coll. no. xxxviil. Bed no. 25 : and subviir. clausa. 

 XL. Beds nos. 22 and 46. 

 XLI. Bed no. 25. 

 LXI. Coarse. Bed no. 46. 

 XLiVu. Bed no. 22. 

 LXVs, with big lobe ; 9 and 10 granulate 

 and one B. Kl.-nuda. Bed no. 46. 

 LXVigj 9. Smoothish and granulate. Bed 

 no. 25. 



Subvariety clausa^ nov. (Fig. 9.) 



Mr. Vine's no. XLVii, from the bed no. 46, exhibits a 

 weak condition of the variety tuberculata (Salter), similar 

 to that shown by the small specimen (a cast) from the 

 Upper Llandovery of Howler's Heath, near Malvern, figured 

 in the Geol. Mag. decade ii. vol. viii. 1881, p. 345, pi. x. 

 fig. 12, and belonging to this subgroup, in which the hind 



