29-4 SIR SIDNEY F. HABMER ON 
In dealing with these questions I have had the great advantage of being able 
to make use o£ the imjiortant type-specimens, particularly those of Busk, in 
the British Museum. Some of the results thus obtained ai-e given in the 
present paper, which is intended to be preliminarj^ to my fuller Report. 
The genera considered are those of the " Gellularine " series, together with 
others which have to be discussed in connection with these. For the purposes 
of this general survey I am obliged to give diagnoses of several new genera ; 
but I restrict myself to those which are strictly necessary, believing as I do 
that the practice of publishing preliminary diagnoses which cannot be fully 
understood without adequate illustration is one to be avoided as much as 
possible. I devote special attention to species which have been included in 
the genus Menipea ; and I venture to think that the grouping here suggested, 
in this and other genera, will give greater precision to certain questions of 
Oeographical Distribution. I desire to acknowledge specially the valuable 
assistance I have received from my colleagues Mr. 0. Davies Sherborn and 
Mr. R. Kirkpatrick. Mr. Sherborn has helped me particularly with regard 
to the dates of publication of various Memoirs, while his invaluable MS. list, 
at present in course of publication (Index Animalium, 1801-1850) by the 
Trustees of the British Museum, has been of special assistance in ascertaining 
that several genera in current use are preoccupied. Mr. Kirkpatrick, who 
is in charge of the Collection of Polyzoa in the British Museum, has given 
me much appreciated lielp in referring to the specimens, and in other ways. 
Special attention may be directed to Sect. III. (Internal avicularia) and 
Sect. IV. (Methods of bifurcation). 
The present paper is divided into the following Sections : — 
L Introduction. 
II. Literature and Nomenclature. 
III. Internal avicularia. 
IV. Methods of bifurcation of the colony. 
V. Characters of certain genera and species of Scrupocellariidse. 
IT. Literature and Nomenclature. 
This Section includes a list of Memoirs to which shortened references are 
given throughout the paper ; but full references are given, in their proper 
places, to many other works not included in the list. The Bibliography is 
followed by an alphabetical list of genera, in which I have endeavoured to 
establish the respective genotypes, where this has not already been done. 
In constructing this list I follow the example which has been given by Lang 
(1917, Geol. Mag., Dec. vi, vol. iv. p. 169). I have also indicated, as fur as 
possible, the names which appear to me synonymous with genera of earlier 
