VINE : CLASSIFICATION OF THE PALAEOZOIC POLYZOA. 
33 
species otherwise than in its feather-like arrangements. In a note 
Lonsdale says This coral is considered by Goldfuss to be a Flustra,'^ 
but it is placed by Milne Edwards among the doubtful species of that 
genus, (2nd Ed. Lamk, pt. ii, p. 219). From Eschara it differs in 
not having a central partition. I have ventured to propose the above 
name taken from the feather-like arrangements of the middle and 
lateral cells, "f Only one species is placed in the genus by Lonsdale, 
P. ktnceolata, Lonsd., and he remarks " Small fragments of probably 
young specimens of this species are occasionally found in the shales 
of AVenlock limestone." It is from fragments so abundantly distri- 
buted in the Wenlock shales that I selected the types of my species 
P. lonsdalei The Esdmra scalpellum, Lonsd , is present in the 
Wenlock shales also, though not so abundant. It is certainly not an 
Eschara, neither is it a Ptllodictya, in the same sense as the type 
species of Lonsdale or Goldfuss. In my classification I except this 
species as I am still doubtful where to place it. The Ptihdictya 
inteiyorosa, Vine, according to the arrangement of Mr. Ulricli, is a 
Stictoporelhi, and not a Ptilodictya, hence we have only the two 
species P. lanceolata, Lonsd., Dudley limestone, and P. lonsdalei, 
Vine, in our British rocks, if the British species are retained 
as Ptihdictya, Lonsd., and not as t^tictopora. Hall. 
The careful study of British species, at that time including 
Eschara scalpellum as a Ptihdictya, led me to remark of Phillips' 
Flustra? 2mrallela = Vincidaria, id. M'Coy, "I . . . prefer to leave 
the Fliistra which Phillips describes with the Ptihdictya as P. par- 
allela, and this reference is founded upon original investigation of 
various specimens of Ptihdictya, &c.":j: This might have been an 
*NoTE. — Fiustra, according to the definition of Goldfuss and Linnaeus, is 
as follows: — Flustra, Linn., stirps foliacea, flexiles, lapidescens, cellularium 
seriabus in utraque pagina, e basis frontis radiantibus quasi contexta. — Petrifac, 
p. 32. Flustra, somewhat stony, submembranaceous, and flexible, on a thin 
crust, consisting of contiguous cells, set in many regular series, on one or both 
surfaces ; cells sessile, short, oblique, with a terminal, irregular, frequently den- 
tated, or ciliated margin. — Brown's Zoologists' Text Book, 1st Ed. 1833, p. 566. 
t Silurian System 1839, p. 675. Redefined by M'Coy, Brit. Pal. Foss. 1847, 
( = Sticktopera, Hall). 
{ Brit. Assoc. Report on the Garb. Poljzoa, 1880, p. 2 of Report. 
3 
