196 nerpornt—1883. 
AcanTHooLapiA, King = ? IcutHyoracuis, M‘Coy. 
(A. Tuamniscipm, King.) 
Zoariwm bilaterally branched more or less in one plane, rarely bifur- 
cating. In his description of A. anceps, King says: ‘Rows of cellules 
from three to six on the stem.’ 
M‘Coy’s definition of Ichthyorachis is as follows :— 
«A straight central stem, having on each side a row of short simple 
branches or pinne, all in the same plane, obverse rounded, without keel ; 
each bearing several rows of small prominent oval pores, arranged in 
quincunx, reverse smooth or finely striated.’—‘ Carb. Foss.,’ pl. XXTX. 
fig. 8. 
The Ichthyorachis as described by M‘Coy is peculiarly a Carboniferous 
type. I have met with it in the Carboniferous strata of Derbyshire, and 
I prefer that the name should remain, at least for the present. 
Carboniferous Ichthyorachis Newenhamt, M‘Coy. 
Permian Acanthocladia anceps, Schlot. (and King). 
Family VIII. Hereroporips. 
Zoarium cylindrical or multiform, undivided or branched; surface 
even, furnished with openings of two kinds—the proper zowcia, and inter- 
zocecial openings; occasionally encrusting. 
Genus Heteropora, Blainville. 
»,  Hyphasmapora, R. Etheridge, jun. 
The ‘Ceriopora’ of the Carboniferous epoch may be conveniently in- 
cluded in the genus Heteropora. Hyphasmapora, on account of certain 
structural peculiarities, must, I think, be kept as a distinct type. 
Carboniferous Heteropora interporosa, Phill. = Ceriopora, Phill. 
” similis, Oe ae ” ” 
5 Hyphasmapora Buskii, R. th. Jun. 
Jurassic “ conifera, Lamx. (multiform type). 
pustulosa, Michelin, ranging into the ‘Crag.’ 
9 ” 
reticulata, Haime. 
” ” 
Cretaceous = dichotoma, Goldf. (See first part of present 
Report). 
> 5s reticulata, ? Busk > o 
” ” Sp. ” ”? 
AS * tenera, Hagenow % i, 
Suborder CryProsToMATA. 
Zoccia tubular, subtubular, in section (occasionally) slightly angular. 
Orifice of cell surrounded by vestibule, concealed. 
I have already pointed out the peculiarities of this suborder when 
speaking of the one proposed by Mr. Ulrich. It will be well, therefore, 
to deal very fully with the genera and species that I propose to assign to 
this division of Paleozoic Polyzoa. 
Mr. Ulrich in his classification of ‘ American Paleozoic Bryozoa’ (op. 
cit. p. 151) proposes two family names for the grouping of species which 
have heretofore been loosely placed in one group only. The first is the 
