184 
vine: POliYZOA OF THE WENLOCK SHALES. 
A. radiciforme Vine, Quar. Jour. Geol. Soc, Feb., 1882. p. 53, 
f. 3. 
A. radiciforme Vine, Ann. Mag. Nat. Hist., Aug., 1884, p. 82, 
fig. 3, No. 1-6. 
A. radians? Nich. and Eth. Quar. Jour. Geol. Soc, Nov. 1881, 
p. 619. 
Habitat: On stems of crinoids and fragments of shell. 
Localities: Buildwas beds, Wenlock shale, Shropshire. 
3. AscoDiCTYON STELLATUM, Nich. and Eth. Jun. 
Var.: siluriense. Vine. PI. XII., fig. 6. 
Ascodictyon stellatum Vine, Quart. Jour. Geol. Soc, Nov., 1881, 
p. 618. 
A. stellatum, var. siluriense Vine, Quart. Jour. Geol. Soc, Feb. 
1882, p. 52, fig. 1-2. 
A. stellatum, var. sihiriense Vine, Ann. Mag. Nat. Hist., Aug. 
1884, p. 81, fig. 7. 
The colonies of this peculiar species are very abundant in the 
shales, and though it is found in other localities than the one given 
below, still the most typical forms have a very limited range. 
Habitat: On stems of criniods and broken shells, and sometimes, 
though rare, on corals. 
Locality: Buildwas beds, generally. 
Range: Hamilton formation (Middle Devonian) of Widder, 
Ontario (Nicholson). 
4. Ascodictyon radians, Nich. and Eth. Jun. 
A. radians Nich. and Eth. Ann. Mag. Nat. Hist., June, 1877. 
A. radians. Vine (Observations) Quart. Jour. Geol. Soc, Feb., 
1882, p. 54. 
My own specimens of this peculiar species differ considerably 
from those described by the authors in their joint papers. The 
elongated vesicles are less attenuated, and the fenestrate filiform 
threads which cover very compactly the stem of the crinoid on which 
colonies are found, resemble rather closely the clustered forms of 
Ascodictyon filiforme of the Wenlock shales; then again, the stellate 
rosettes which are found upon the stem, show a very close relation- 
