VINE : CARBONIFEROUS POLYZOA. 
337 
on the middle keel an irregular line of round tubercles, which 
sometimes intermit and sometimes show a disposition to become 
double."* In the Scotch lower Limestone Shale beds of Hairmyres 
this species is very abundant ; and after examining a large suit 
of specimens, and comparing the Yorkshire fragments with these, 
I cannot help placing them under the specific name which I 
have adopted. There is an additional interest in two frag- 
ments sent me by Mr. Harker, who was most careful in the 
location of his specimens. The two specimens are marked " Yore- 
dale Rock, near Richmond." I can build nothing upon this state- 
ment, and I should have passed it over without reference had not the 
following occured in Mr. Etheridge's Address to the Geological 
Society. The Carboniferous Bryozoa, as a group, constitute by 
far the largest series in any division of the Palaeozoic rocks. 77 
species range through the three lower horizons of the Car- 
boniferous series; not a single species passes to or occurs 
in the Yoredale, Millstone Grit, or either one of the three divisions 
of the Coal Measures."t If such be a fact, and Mr. Harker's 
reference wrong, working Geologists in the Hurst or Richmond 
district can set the question at rest by working for fossils in these 
rocks. 
Localities : — Hurst, Richmond, Limestone Shale ; Yoredale, 
Rock (?) 
16. Hyphasmapora Buskii, Etheridge, Jun. PI. xvi, Fig. 6. Ann. 
Mag. Nat. Hist., ser. 4, vol. xv., p. 43-45, pi. iv., fig. 1-4. 
Fragments of this beautiful species are present in the Shale, 
but are very rare. I have five fragments but so characteristic 
are they that there is no mistaking them, for the species is 
unique. In his Generic description, Mr. Etheridge says : — 
u Polyzoarium dendroid, calcareous, composed of small cylindrical 
stems, often bifurcating. Cell depressions arranged in linear, 
longitudinal series, more or less separated from one another by a 
* These are typical features quoted from Prout, Geo. Mag. , 1 874. 
t Presidential Address. Geo. Soc., p. 185, Feb., 1881. 
