41 
40. SYRINGOPORA PERELEGANS (Billings). 
Syringopora perelegans (Billings,) Canadian Journal, New Series, Vol. IV., p. 117, 
fig. 19. 
Corallites averaging about one line in diameter, straight or slightly flexuous, distant 
from one another their own diameter or a little more, connecting tubes horizontal or slightly 
oblique, varying in their distance apart, but usually from two to four lines distant on the 
same side of any given corallite ; surface obscurely or deeply annulated. 
This species is very closely allied to Syringopora reticulata (Goldfuss), from the Carbo- 
niferous rocks of Europe, differing perhaps in nothing except that the connecting processes 
are not quite so closely set. It is also nearly related in many respects to S. Maclurei (Bil- 
lings), it being very difficult to decide with regard to certain specimens to which of the two 
forms they should be rightly referred. 
Locality and Formation.—Not uncommon in the Corniferous Limestone of Port Colborne, 
and very abundant at Lot 6, Con. 1, Wainfleet ; also in the Corniferous Limestone of Wood- 
stock (Billings). 
41, SyrincoporaA Macuuret (Billings). 
Syringopora tubiporoides (Billings), Can. Jowr., New Series, Vol. IV., p. 115, fig. 17. 
Syringopora Maclurei (Billings), Ibid. Vol. V., p. 258. 
‘<This species is found in large masses of long slightly flexuous corallites. These have 
a diameter of about one line and a-half, and owing to their flexuosity, are at times in contact, 
and often two, three, or four lines apart. In large colonies which have grown luxuriantly 
without the interference of disturbing causes, the corallites are more regular than in the 
- smaller or stunted groups, in which the corallites are much bent and confused. The 
connecting processes are very short and distant, and appear to be sometimes mere inoscula- 
tions of the stems. The corallites, after growing separately for a short distance, approach 
each other and seem to grow together or adhere to each other for the space of a line and 
a-half, or more; they then diverge and again unite. These points of contact occur at distances 
varying from three lines to six, nine, or even twelve lifes. Externally they exhibit numerous 
other indistinct annulations, and also faint indications of longitudinal strive” (Billings). 
The most striking character which would separate S. Maclurei from S. perelegans is the 
diameter of the corallites, stated in the above description as being one line and a-half in the 
former, whereas it is only a line in the latter. In a later paper (Canadian Jour., New Series, 
Vol. v., p. 258) Mr. Billings, however, states that the width of the corallitesin S. Maclurei is 
more generally only about a line, thus coming to agree in this character with S. perelegans. 
he surface-characters of the corallites in the two species are also the same. The chief’ dis- 
tinctions, therefore, between the two forms are to be found in the fact, that the corallites of 
S. Maclurei are somewhat more robust on an average those of S. perelegans, that they are at 
the same time more flexuous and bent, that they are not placed at such uniform distances 
apart, and that the horizontal connecting processes are not by any means a marked feature, 
being delicate and separated by wide intervals, whilst the corallites often inosculate directly 
without the intervention of connecting processes at all. Many examples of §. Maclurci are 
undoubtedly distinct from all other described forms, and the species may be regarded as being 
in many repects a connecting link between such an aberrant type as S. nobilis and the typi- 
cal forms like S. perelegans. Some specimens, however, occur which can with difficulty be 
certainly referred to either S. Maclurei or S. pereleguns. 
Locality and Formation.—Not uncommon in the Corniferous Limestone of Ridgeway. 
42. SYRINGOPORA LAXATA (Billings), 
(Plate VI. Fig. 2.) 
Syringopora laxata (Billings), Cunadian Journal, New Series, Vol. [V. p. 118. 
Corallites cylindrical, flexuous, sometimes geniculated, but not connected together by 
transverse processes. Hpitheca with numerous encircling striz and annulations. Diameter of 
the corallites from one and a half to two lines, the distance between them being very variable. 
In the absence of connecting processes, the present singular species differs from all the 
typical examples of the genus, and it seems doubtful whether it can be retained in Syringopora 
