11 
Z. cainodon is tlie longest of the smaller species of our Zaplirentis, 
one example measuring three and a half inches in length. 
The form of this coral is decidedly more Amplexiform than it is 
Zaphrentoid ; hut the convergence of the septa to the centre and presence of 
dissepimental tissue indicate its generic affinities. The primordial laminae of 
the septa are always distinct in the specimens which I have examined, 
although surrounded hy much stereoplasma. The latter, on the dorsal side, 
at a short distance helow the bottom of the calice, becomes fused into a con- 
solidated mass, intcrseptal loculi being only visible on the ventral side of the 
corallum, and even then not many of them. This dense deposit of stereo- 
jilasma is well seen in a vertical section of the corallum (PI. VIII, Pig. 16) 
taken from immediately heloAV the calice of the individual specimen, and to 
some extent recalls the filling up of the corallum base in Lindstromia^ 
Nicholson and Thomson. The vesicular condition of the tabulae imme- 
diately helow the floor of the calice is also apparent. 
Loccdihf and Horizon. — Jervis Bay, Co. St. Vincent (C. Cullen) : — 
Upper Marine Group. 
Zaphrentis (PLEROPnvLLUM ?) GREGORiANA, He KonincJc. 
PI. A^ITI, Pigs. 3-12 ; PI. IX, Pigs. 8 and 9 ? 
Zapltre^llis Gregoriana, De Koniuck, Poss. Pal. Nouv. Galles du Sud, 1877, Pt. 3, p. 150 
t. 5, f. 7. 
Sp. Char. — Corallum of medium size, more or less cornute, hut the 
curvature never great ; section circular ; base sharply pointed. Calice 
moderately deep. Septa thirty-six to thirty-eight, thickened at their 
proximal or basal ends by the deposition of stereoplasma, which unites to 
form a coalesced mass on the dorsal side, but the primordial septa remain 
distinct ; the ventro-lateral groups curve upwards and inwards to surround a 
large septal fossula, which extends just to the centre of the calice, occupied 
by one or two counter septa; cardinal septum not apparent; dissepiments but 
little developed'^ ; interseptal loculi elongated triangular spaces. Tabulate 
^ See Nicholson and Etheridge, Mon. Sil. Foss. Girvan in Ayrshire, 1S78, Fas. I, p. 84, f. 4. 
2 De Koninck records this species from Rurragood on the Paterson River. 
^ De Koninck says that the septa are united by irregular vesicles, especially in the outer part of the 
corallum, but I have not observed these. 
