e 
506 ON ZAPHRENTOID CORALS FROM BRITISH DEVONIAN BEDS. 
EXPLANATION OF PLATES XXI-XXTII. 
Puate XX. 
Fig. 1 (a, 6). Zaphrentis calceoloides, mihi. Mudstone Bay. 
2. Campophyllum? Mudstone Bay. 
3 (a, ere ia hela at ? Hole Head, near Teignmouth; 33, enlarged 
iam. 
4 (a, b,c). Zaphrentis, sp. nov.? (lower part). Dartington. 
5 (a, 6). Zaphrentis, sp. nov.? Dartington. 
6. Amplexus (or Zaphrentis). Dartington. 
7. Zaphrentis, sp. Woolborough (Brit. Museum). See also Plate 
XXIII. fig. 1 (a, 0). 
Puate XXII, 
Fig. 1 (a, 6). Zaphrentis (or Amplexus). Dartington. 
2 ?, 3, 4, 5. Zaphrentis subgigantea, mihi (or var. of gigantea, Lesueur). 
| 
Prats XXIII. 
Fig. 1 (a, 6), Zaphrentis, sp., see Plate XXI. fig. 7. Lummaton, near 
Torquay. 
2. Zaphrentis mudstonensis, mihi, in shale or mudstone. ~ 
3. Amplecus tortuosus, Phillips. Bishopsteignton. 
4 (a, 6, c) &5. Cyathophyllum ? bilaterale, mihi, Tuckenhay Creek, on 
the Dart; 4c, enlarged 2 diam. 
Discussion. 
Prof. Duncan said that a more accurate definition of the Rugosa 
was very desirable. The author had wisely abstained from estab- 
lishing new genera, or giving new generic diagnoses, while, at the 
same time, he furnished many details of character which would 
prove most useful in a generic revision of the group. He inquired 
whether the costal characters of the species could be ascertained. 
In his opinion the Mesozoic Corals or Aporosa were not the descen- 
dants of the Rugosa; and, in fact, it might be regarded as doubtful 
whether the latter are corals at all. From the great difficulty of 
understanding their nature, all precise details of structure, such as 
those described in the present paper, were of much importance. 
Mr. Eruermer remarked that the author had worked most indus- 
triously upon the specimens contained in the British Museum collec- 
tions, to which, indeed, he had very liberally contributed. The 
results given in the present paper were drawn from the investigation 
of a large number of specimens, and add much to the knowledge of 
the Zaphrentide. 
The AurHor in reply thanked the meeting for the reception given 
to his paper. Few localities in Devonshire furnish specimens show- 
ing the external characters well. 
