WENLOCK GROUP. 99 
WENLOCK LIMESTONE AND SHALE. 
It is not advisable to keep these separate, for in the Eastern Counties the limestone often dies away to 
a mere trace, and in 8. Wales it is rarely to be seen at all. In North Wales and Westmorland the Wenlock 
formation is chiefly mud, slate, or shale. In §S. Wales shale and sandstone, more frequently a clayey sandstone. 
The fossils consequently vary much in different localities, the more sandy strata often containing species which 
in Shropshire are confined to sandy beds in the Ludlow rock. 
F.C. Fletcher Collection, part of which is & a separate cabinet F. C. 


Case and , ian 
Column of RAGSRGO 2) Lott Names and References ; Observations, &c. Numbers and Localities. 
Drawers. | Synopsis: and Figures of Genera, 


Plante vere. Most of the species known as 
Fucoids (i.e. seaweeds, fossil) are nothing 
more than the filled-up burrows of worms, &c, 

Chondrites, Brongn. A genus intended to in- 
clude many different forms. 
Chondrites verisimilis, Salter (Expl. Edinb. | a 317, Dudley, F.C. 
Memoir, Geol. Surv. p. 134, pl. 11, fig.1). A 
true sea-weed, like Fucus cartilagineus. 
FC 
AMORPHOZOA (Sponges). 
Sponges. Stromatopora, Coscinopora, Cnemidium, Ver- 
ticillopora, Stellispongia, &c. are examples 
of very solid caleareous sponges. Ischadites, 
Spherospongia, Amphispongia, and other 
Silurian forms are supposed to be distantly 
allied to the living Grantia. 

Gb10 p. 12. Stromatopora striatella, D’Orb. (Siluria, 2nd | a. 683, a. 684, Wenlock ; 
FC ed. Foss. 51, pl. 41, fig. 31). iS. Concentrica, | b. 655, Dudley, F. C.; 
Lonsdale, Sil. Sys. t. 15, fig. 31 (not of Gold- | a. 684, good polished sec- 
fuss). tion. 
Cnemidium tenue, Lonsd. (Siluria, 2nd ed. pl. | a. 318, Dudley, F. C. 
38, fig. 11). An obscure genus of calcareous 
sponges with minute oscula. Such sponges, 
and such as the following species :— 
Verticillopora abnormis, Lonsd. (Siluria, 2nd | Dudley, F. C. 
ed. Pl. 38, fig. 10), are common in the 
Wenlock Limestone here and there. 
(Fistulipora, McCoy. See Corals. I doubt if 
this be more than a sponge. J. W.S.) 


13—2 
