12 
area well marked but not large, diminisliing mucli in size towards the base. 
Piiigm generally single on the dorsal side, bifurcate on tlie ventral ; epitlieca 
not preserved, but probably very thin ; growth accretions present, but 
slight. 
Ohs. — De Koninck compared this species to Zaphrentis cliffordana, 
Ed. & II. ; but it differs from the latter by the arrangement of the rugae, 
and is much larger. The dissimilarity of the costae on tbc ventral and dorsal 
sides distinguislies tins species from most of the other Australian species. 
The want of resemblance to Z. cainodon is at once apparent ; but those 
S2:>ecimens which I have examined ju’esent a general similarity in the 
grouping of the se2)ta. 
In connection with this S2)ecies some very interesting internal casts 
and external impressions may be referred to, esj)ecially as the number of 
sej)ta and their groujiing, form of the corallum, and joosition of the septal 
fossula are identical with those of Z. gregoriana. Both in the imjiression 
(PI. IX, Pig. 9) and matrix surrounding the casts (PI. IX, Eig. 8) the 
C2:)itheca is seen to be jherced by a number of irregularly-arranged holes, 
A’arying in numl)er and contiguity to one another in different sjiecimens, 
although in some exam^iles more closely set towards the uj)2)er j^ortions of 
the corallum. These clearly represent epithecal out- growths, such as are met 
with in some species of Zaphrentis, Amplexus, &c. It is equally clear that 
the epitheca in these corals was thick, with moderately strong accretion 
swellings. On the other hand, we lack definite information as to the 
epithecal characters of Z. gregoriana , and the relation between these casts 
and the latter must, therefore, remain for the 2)resent unsolved. 
In PI. VIII, Eig. 7, is visible one of those peculiar processes spring- 
ing from the floor of the calice, which have been so abundantly and excel- 
lently figured by Eudolph Ludwig in his Memoir, “ Corallen aus paliiol- 
ithisciien Eormationen,” in figures of Zaphrentis and other genera, esj)ecially 
one termed by him Cyathodactylia} 
Locality‘S and Horizon. — Jervis Bay, Co. St. Vincent [C. Cullen) : 
Upper Iflarine Group. The sj)inose casts are from Shoalhaven Heads and Cojijier 
Point, Shoalhaven Biver, Co. St. Vincent {C. Cullen) : — Upper Marine Group. 
‘ Palaeontogiaphica, XIV, Heft 4, t. 36 lb, 2b. 
* De Kouiuck also mentions Colocolo 
