51 
1894. — In a paper on “ East-Prussian and Eastern West Prussian 
Silurian Corals,” Mr. W. Weissermel described Amplexus borussicus. 1 * The 
coralluni is evidently sub-fasciculate, of long, cylindrical, straight or curved 
corallites, augmenting by gemmation which is doubtfully said to be lateral. 
Primary and secondary septal laminae are present, the former spined on 
their free edges, the latter represented by rows of granules. The tabulae 
are regular and complete ; dissepiments do not exist, and no mention is made 
of a fossula. The affinities of this coral are believed by the author to be 
with Amplexus , but, from the clear description and figures, I have little 
hesitation in pronouncing it to be a Tryplasma. Indeed, the author also 
suggests an affinity with Pholidophyllum, but considers the length oL‘ the 
septal spines in his species as a point of distinction. A reference to some of 
Lindstrom’s figures of P. tubulafum 2, will show that this possessed equally 
long spines. 
Weissermel also afforded some interesting particulars about (Jcelo- 
phyllum 3 and Pholidophyllum. lie regarded the first merely as a sub-genus 
of Amplexus, following Erecli, and described bis C. euryealyx as forming 
£t bundle-shaped masses,” the corallites varying from between short coniform to 
long subcylindrical, with bell-mouthed calices and everted margins, diverging 
from one another ; fistulse are present. The septal lamellm are more than 
fifty, and of two orders ; the secondary, if I understand the author correctly, 
are toothed. The tabulae are complete, horizontal, and closely packed. 
Copious calicular gemmation takes place ; the buds at first “ pouch- 
shaped,” then becoming slightly divergent slender cones, and giving to the 
entire colony a cluster or bundle-like appearance ; there are eight buds to a 
calice. 4 5 Weissermel very justly draws attention to the close resemblance of 
the septal apparatus of his coral to that of Pholidophyllum and Polyorophe, 
Lindstrom. He also figures the wide expanding calice, close tabulrn 
occupying a stem-like corallum, and toothed free edges of some of the septal 
lamellae. The resemblance between these structures and those of one of our 
New South Wales Tryplasmce, particularly those of the calice and stem, is 
very marked, and will be commented on later. 
Weissermel also refers to Pholidophyllum a composite coral," composed 
of bundles of long cylindrical corallites in contact with each other, and 
1 Weissermel. — Zaitseh. Deuts. Geol. Gesellssh., 1894, XLVI, Heft 3, p. 632, t. 50, f. 7 a and b. 
- Lindstrom — Bihang K. Sv. Vet.-Akad. Handl., 1882, VII, No. 4, t. 9, f. 14 and 15. 
3 Weissermel — Zeitscli. Deuts. Geol. Gesell., 1894, XLVI, Heft 3, p. 634, t. 50, f. 8 and 9, t. 51, f. 1. 
4 Weissermel — Ibid., p. 636, f. 1 and 2. 
5 Weissermel — Ibid., p. 638, t. 51, f. 2 a and b. 
