1893. NOTES AND COMMENTS. 249 
fied us that it is of great importance that the military and naval 
authorities should be furnished with accurate information respecting 
the position of the favourite fishing grounds in the localities where 
target practice is carried on, and of the times of tide and seasons when 
fishermen in the neighbourhood are ordinarily engaged upon parti- 
cular grounds, and of the character of the pursuits followed. And 
of the gear used by fishermen at different times of the year in fishing 
for various kinds of fish.” Mr. Calderwood has furnished to the 
Committee, who have reproduced it in their Report, a map showing 
the localities for special fish off Plymouth during the month of April. 
Of course, these localities vary from week to week, and it would be 
desirable, and no doubt important, if a large series of such sketch- 
maps could be published. The evidence offered as to the effect of 
the electric light in attracting or frightening fish is conflicting, and 
the same may be said of the noise of the firing of heavy guns. 
We note that the index shows a great improvement on the general 
run of indexes to Blue Books, it is really a useful précis of the whole 
Report. 
TERTIARY Mo.Liusca oF FLORIDA. 
WE have received from Mr. W. H. Dall the second part of his 
“Tertiary Mollusks of Florida” (Trans. of the Wagney Free Institute of 
Science, vol. ili., pp. 201-474). This part completes the account of 
the Gasteropoda, and places in our hands, at last, better materials 
for the study of former zoological provinces. No group of Tertiary 
fossils has been so well examined in many different parts of the world 
as the Gasteropods, and by a careful comparison of the different 
monographs that have lately appeared, we ought to be able to obtain 
information as to the former continuity or isolation of the different 
areas. An account of the Tertiary marine gasteropods of the Pacific 
slope of America is still wanted. Until they have been examined, it 
will be difficult to speak with confidence as to the dates of submer- 
gence of the isthmus of Panama, and we also cannot deal with the 
possible diversion of the Gulf Stream at different epochs, and its 
effect on the climate of Western Europe. 
TERTIARY MoLiusca oF PIEDMONT. 
WeE are glad also to observe that the splendid monograph on the 
Tertiary Mollusca of Piedmont, left unfinished on the death of 
Professor Bellardi, is steadily progressing under the hands of 
Professor Sacco, of Turin. Another part has lately appeared, and we 
may expect before long to see the completion of the gasteropods. The 
Tertiary molluscan fauna of Italy is so prolific, that the monographing 
of those found even in a single region is a herculanean task. We hope 
that Professor Sacco will receive sufficient encouragement and 
