410 REPORT— 1890. 
ments around the coast, one of which should be attached to one of the 
columns of the Serapeum, to register the level of the water. 
Practical results —If the lowering of the land-level progresses with a 
uniform rate along the whole length of the sewer this great work can 
serve for many years, in fact until the bottom of the sewer is considerably 
beneath the sea-level. But if the sinking is not uniform along its whole 
course, but greater at one point than another, it might soon become useless 
on account of the diminished and variable fall at different parts of it. 
Conclusion.'—In short, we find that the maximum difficulty in the 
execution of this work is undoubtedly the high temperature of the rocks 
to be traversed for such a distance without ventilation shafts. Besides 
these the other obstacles to the work are of no small moment. At any 
rate this will be a most daring attempt of human skill and enterprise in 
penetrating into the very bowels of an active volcano. 
Fourth and final Report of the Committee, consisting of Mr. R. 
ETHERIDGE, Dr. H. Woopwarp, and Mr. A. BELL (Secretary), 
appointed for the purpose of reporting wpon the * Manure’ 
Gravels of Wexford. (Drawn wp by Mr. A. BELL.) 
Wexford and Ballybrack. 
The transference of the collections of the Irish Geological Survey to 
the new Museum of Science and Art, Dublin, has brought to light the 
greater part of the species recorded by Capt. James (‘ Journ. Dub. Geol, 
Soe.’ vol. iii.) from the Wexford deposits, A few are yet wanting, and 
others are preserved in the Museum of Practical Geology, London. 
After careful examination I am still of the same opinion—that some 
were obtained from the marls and not from the gravels. Eliminating 
these, the following added to my previous list (No. 1) give a fairly com- 
plete catalogue of the fauna of the Wexford gravels :— 
Aporrhais pes pelecani ? Trichotropis borealis ? 
Fusus rostratus (F. crispus of Trophon Barvicensis. 
previous writers). 53 latericeus. 
» gracilis. Anomia ephippium. 
:»  islandicus. Artemis exoleta. 
»  propinquus. Corbula nucleus. 
Se Saini: Cytherea Chione. 
Lacuna divaricata, Leda pernula. 
3 puteolus. » pusio? 
Melampus pyramidalis. Lutraria elliptica. 
Mitra — (cornea ?). Mactra solida. 
Natica affinis. Nucula nucleus. 
a catena. »  proxima? 
Nassa reticosa. Pecten tigrinus. 
»  (semistriata ?) >> varius. 
Pleurotoma exarata. Pectunculus pilosus. 
harpularia. Pholas crispata. 
3 nobilis. Saxicava rugosa. 
2 leevis (n. sp.). Tapes virgineus. 
Scalaria Trevelyana. Venus fasciata. 
a greenlandica, Yoldia hyperborea ? 
} Engineering suggestions have been excluded here, but may be found in the 
translation published in the Bol. del R. Com. Geol. It. 1890, Nos. 1, 2. 
