40 Dr. G. J. Hinde on Badiolaria from the 



the granulosa, nor, I think, is this possible without the aid of 

 the microtome. 



EXPLANATION OF PLATE II. 



Fig. 1. Process of attachment of ovum attributed to Gohius minutus ; 

 the filaments are mostly curtailed. y?/ = filament ; p= pedicle of 

 attachment; 5/; = apertures in process of attachment ; z. r. =zona 

 radiata. (Zeiss D, Oc. 4.) 



Fiij. 2 Group of ova in sitt/. X 3. 



Fig. 3. Detached ova highly ma<^nified. «. p. = process of attachment ; e= 

 embryo; ?/=yolk. 



Figs. 4, 5. Ova of Gobius niger from glycerine-preparations, enlarged 

 under lens. 



Fig. 6. Larval Gohius of 14th May, 1890 ; length 3-57 millim. a. i. = air- 

 bladder ; A=heart ; n=notochord; i/=yolk. Magnified. 



IV. — Notes on Badiolaria from the Lower Palaeozoic Rocks 

 {Llarideilo- Caradoc) oj the South oj Scotland. By GeORGE 

 Jennings Hinde, Ph.D. 



[Plates III. & IV.] 



The Eadiolaria described in this paper are contained in speci- 

 mens of chert collected from several different localities in the 

 Soutliern Uplands of Scotland, and sent to me for examina- 

 tion by the Geological Survey of Scotland through B. N. 

 Peach, Esq., F.G.S. From the most promising pieces of 

 this chert a number of microscopic sections have been pre- 

 pared, and from these the i'orms have been studied. I may 

 premise that the occurrence of these minute organisms in this 

 chert was first announced by my friend Prof. H. Alleyne 

 Nicholson, M.I).*, of Aberdeen ; but the specimens which he 

 examined did not show the structure sufficiently well to allow 

 of positive determination as to their real nature. 



The chert containing the Radiolaria occurs in beds and 

 intercalated nodular masses in a portion of the well-known 

 series of Ordovician or Lower-Silurian strata forming the 

 Southern Uplands of Scotland ; and it is more particularly 

 developed in the counties of Lanarkshire, Peeblesshire, and 

 Edinburghshire. Mr. B. N. Peach f, who has lately been 

 resurveying the district, informs me that he has traced a defi- 



• Trans. Edinb. Geol. Soc. vol. vi. pt. i. p. 56 (1890). 



t A full description by Mr. Peach of the geological and stratigraphical 

 relations of these rocks will appear in a forthcoming Geological Survey 

 Memoir on Sheet 16. 



