40 
a Diphyphyllum and are not connected by horizontal processes ; whilst the latter in its adult 
state seems to have entirely the habit of an 4ulopora with the internal structure of Syringo- 
pora, but equally without connecting processes. 
Five species of Syringopora have:been recorded by Mr. Billings from the Corniferous Lime- 
stone of Western Ontario, all of which have come under my observation in the same formation. 
38. SYRINGOPORA NOBILIS (Billings). 
Syringopora nobilis (Billings), Canadian Journal, New Series, Vol, iv., p. 118. 
Corallum, lax, spreading, increasing by the production of lateral buds. 
Corallites very large, varying with age from one and a half lines to five 
lines in diameter, apparently not connected by transverse processes. 
Septa obsolete; tabule infundibuliform. Epitheca thick, with en- 
circling strize and stronger annulations. 
Internally this species has all the characters of Syringopora ; but 
the corallites are much larger than in any other known species of this 
genus, and I have never seen any specimen in which transverse con- 
necting processes are developed, It is doubtfnl, therefore, if the spe- 
cies can with propriety be refained under Syringopora. 'The usual 
diameter of the corallites is about three lines, but young examples 
have a diameter of one and a half lines, whilst Mr. Billings states 
that full-grown specimens sometimes attain a diameter of no less than 
five lines. As regards its mode of erowth, S. nobilis is exceedingly 
like a gigantic Aulopora, except that the branches are produced at com- 
paratively longer intervals. Mr. Billings also states that the infundi- 
huliform tabulze are “so blended together as to produce a structure 
somewhat similar to the vesicular tissue of the genus Cystiphyllum.” 
This singular species can always be recognised by the internal strue- 
ture, mode of growth, and great size of the corallites, 
Locality and Formation.—Rare in the Corniferous Limestone of Port 
Re eee ae (Bil Colborne. Also, Lot 5, Concession 13, Walpole (Billings). 
ral size. Corniferous Lime- 
stone. 
39. Syrincopora HIsinGERtI (Billings). 
Syringopora Hisingeri (Billings), Canadian Journal, New Series, Vol. IV., p. 116. 
“‘This species forms large masses of very long, nearly parallel or slightly varying, slender 
corallites, which are closely aggregated, and present a rugged or knobby appearance from the 
great number of the connecting tubes. The diameter of the corallites is one-third of a line, 
or a little more. ‘The tubes of connexion are distant from two-thirds of a line to one line 
and a half. The distance between the corallites is for the greater part less than their dia- 
meter. The young corallites branch from the sides of the adult individuals, and immediately 
become parallel with the parent, and connected with it ‘again by the usual tubes of con- 
nexion.”’ (Billings). : 
This elegant species is very readily recognized by the comparatively small size of the 
corallites, the closeness with which they are crowded together, and the great number of the 
connecting processes. It seems to me, however, somewhat questionable if this species is really 
distinct from the previously described 8. Verneuilli of the Devonian Rocks of Ohio, (Milne 
Kdwards and Haime, Pol. Foss. des Terres Paléozoiques, p. 289.) The distinction relied on 
by Mr. Billings in separating the two species is, that the corallites in 8. Hisingeri are distant 
from one another for the most part by less than their own diameter ; whereas in S. Vernewilli 
they are distant twice or thrice their diameter. If this distinction could be shown to hold 
good in a large number of examples of both forms, it would doubtless constitute a difference 
of specific value ; but the distance between the corallites is not absolutely uniform in either, 
and it is therefore not improbable that the difference is one of variety only. In the meanwhile, 
however, it is safer to retain S. Hisingeri as a separate species, very easily distinguished from the 
other species of Syringopora which have been detected in the Corniferous Limestone of Canada. 
Locality and Fornvation.—Not uncommon in the Corniferous Limestone of Port Colborne. 
