PREPAC E. 
HE study of the Bryozoa having been carried on by 
many naturalists in various parts of the world, it 
has followed as a natural result that more than one name 
has been given to a single species, as a reference to the 
cosmopolitan forms of ‘ Wicroporella Malusiz’ and ‘ Micro- 
porella ciliata’ will abundantly testify ; as also, that one 
name has fallen to the lot of two or three different species, 
e.g. ‘ Stomatopora expansa’ of Hincks, and ‘ Stomatopora 
expansa’ of Packard; the ‘ Salzcornaria gracilis’ of Busk, 
and the ‘ Sa/icornaria gracilis’ of Costa, and others. Such 
a result becomes an endless source of trouble, and this 
Catalogue is the outcome of this trouble, and aims at 
bringing into view all the names of published recent 
Bryozoa, with as full a synonymy as may be possible. 
Originally begun for my own private use, it has grown to 
its present proportions as the material for a synonymic 
catalogue constantly increased. 
Two chief ideas have been kept in view. The first 
was to collect in a workable form all the names of recent 
Bryozoa that have been published, so far as books and 
scattered papers could be obtained. Hupé, Quoy and 
Gaimard, Audouin’s Exp/ication, and Michelin's J/auritius, 
are among the works I have failed in procuring. The 
second idea was to reduce the synonymy to something like 
‘fact, including in such synonymy only the fossil forms 
belonging to recent species. To have dealt with the purely 
fossil forms would have involved another ten years of life 
