vi^'e: carboniferous and permiax polyzoa. 
73 
Sub-order Cryptostomata, Vine. 
1882. Cryptostomata. Abstracts. Proc. Geol. Soc, No. -424, (June), 
p. 109. 
1882. „ Geol. Mag., Dec. ii, vol. IX, p. 308. 
1883. „ Fourth Brit. Assoc. Rep., Foss, Polyzoa, p. 36 of Report. 
1884. „ Quart. Journ. Geol. Soc, vol. XL., p. 332, (1882 paper 
abridged). 
1884. „ " Naturalist," Yorksh., p. 65, et. seq. 
1885. Yoredale Polyzoa. Proc. Yorksh. Geol. and Polyt. 
Soc, vol. IX., p. 21. 
1888. Classification Palaeozoic Polyzoa. Ibid, vol. xi., pp. 25 
and 32. 
Zocecia tubular ; slightly sub-tubular in section, or occasionally 
angular. Orifice of Zoacia concealed ; the true cell is surmounted 
by a large vestibule, in the throat of which is the restricted Zooecial 
aperture. Operculw calcareous, sometimes perforated in the centre. 
Family Cystodictyonid^, Ulrich. 
1882. Arcanoporidffi, Vine. Abstracts and Proc. Geol, Soc, No. 424, 
p. 109. (June). 
1882. „ Geol. Mag. Dec ii, vol. ix., pp. 381-382. (August). 
1883. „ Fourth Brit. Assoc Rep. Foss. Polyz., p. 43 of Report. 
1884. ,, Yorksh. " Naturalist," p. 65. Fam. suppressed. 
1884. Cystodictyonidte, Ulrich. Jour. Cine Soc. Nat. Hist., vol. vii., 
p. 34 
1887. ,, Young. Edin. Geol. Soc. Jour., vol. v., pt. iii , p. 34. 
1888. Arcanoporidse, Vine, (History of.) Classification PalaBozoic Poly- 
zoa. Proc. Yorksh. Geol. and Polyt. Soc, vol. XI, pt. i, p. 27. 
I have already given the history of Arcanoporidae and Arcano- 
pora in the paper cited above, and though the priority of my names 
are thus established, it may be well to state briefly my reasons for 
abandoning them . In the American Carboniferous rocks, the Polyzoa, 
though not perhaps more abundant as individuals, are more largely 
representative than in our own, and to me it would be a positive 
objection to have two names for one and the same group of organic 
forms. My desire is to present to the scientific student a monograph 
that shall be in accord with the latest and best i\.merican work, and I 
