16 
stcreoplasma forms a moro or less solid zone, l)ut in the space between it and 
the tahiilm the septa are separate, and there are long irregular loculi. I am 
unahle to distinguish any definite dorsal or ventral fossula, hut there is a 
left lateral one containing a short and rather stout alar septum. 
As regards the epi thecal characters, a spinose or tuhercled cpitheca is 
not unknown in the Zaphrentidm, hut in the present instance this structure 
of the exoskeleton is developed to a greater extent than usual. It is also 
more common in Ainplexus and its allies than in Zaphrentis. Por instance, 
spines exist in Amplexus spinosus, Do Koninck\ and are confined to the base 
of the corail uni ; and in A. lacnjmosiis, De Koninck“, where they are 
generally scattered over the surface. Other corals also possess these struc- 
tures, such as Axophtjllum radiccdum, Do Koninck^, and JPcntaphyllum 
armatiwi, De Koninck\ from the European Carboniferous. also possess 
an Australian species, already descrilicd, furnished with similar excrescences, 
and there is Amplexus piistulosus, IIudlestoA, from the neighhourhoocl of 
the Gascoyne Diver, AVestern Australia. Of the species cited, however, the 
greatest resemblance exists between Axophyllum radlcatum and our species. 
In the latter these out-growths are tubular, hut broken off short, and have 
every appearance of liaving been used as anchoring stolons. 
It may he conjectured that Z. phymatodes is related to the spinous 
form described under Z. yreyoriana , hut the dissimilarity in the number of 
the septa and position of the fossula will at once dispel any pre-conceived 
view of this matter. I believe the two corals to he quite distinct. 
Locedily and Horizon. — One mile south-east of Alulhring, near AVest 
Alaitland, Co. Northumberland (C. Cullen)-. — Upper Marine Group. 
Zaphrentis ? sumpiiuens*^, sp. nov. 
Plate XI, Figs. 4-6. 
Sp. Char. — Corallum of medium size, conical, curved. Septa forty- 
four, with an equal number of secondary lamelloe ; the primary septa are 
long, flexuous, reaching nearly to the centre of the corallum, and grouped in 
* Nouv. Rech. Anini. Fo.ss. Terr. Carl). Belgique, 1872, Pt. I, p. 75, t. 6, f. 6. 
^ Loc. cU., p. 76, t. 6, f. 7. 
3 Loc. cit., p. 24, t. 1, f. 3. 
^ Loc. cit., p. 59, t. 4, f. 8. 
® Quart. Journ. Geol. Soc., 1883, XXXIX, t. 23, f. 1-lc. 
® avn<pvw to make coalesce. 
