24 THE NAUTILUS, 
Excellent illustrations are scattered freely throughout the text, 
illustrating at every point the statements made or the peculiarity 
mentioned ; and this is a new departure in conchological treatises 
An Equivalve, Inequilateral Pelecypod Unio pictorum (L.). a. s. anal or 
excurrent siphon; br. s. branchial or incurrent siphon; f. foot. 
which can hardly be too warmly commended. The illustrations 
herewith shown are examples, and in beauty and fidelity to nature 
they speak for themselves. One would be critical indeed to ask for 
anything better than the figure of Unio margaritifer or Planorbis 
corneus. Thespecies will be illustrated with colored plates, of which 
one accompanies this part. It is a really superb piece of color- 
printing. 
Vertigo antivertigo Planorbis corneus y. albina Helix nemoralis 
(Drap.). Mog. Ihe 
Malacologists will look with interest for the succeeding parts; for 
that before us leads us to hope that Mr. Taylor will break with the 
time-honored but woefully antiquated system of generic and family 
classification of former English manuals of land and fresh-water 
mollusks, and adopt a nomenclature and classification abreast of 
the science. The work will doubtless prove of great utility to those 
interested in British malacology, especially on account of the ex- 
haustive treatment of variation and distribution contemplated ; and 
the features noted above will, moreover, render it useful to eonchol- 
ogists generally. 
