12 BRITISH OAK GALLS. 
galls, or a series of illustrations, many forms which 
resemble well-known British specimens; e. g. Dryo- 
cosmus cerriphilus on twigs of Q. cerris, is very much 
like Aphilothria corticis and A. Sieboldi, which do not 
appear on Q. cerrvis in Britain; Cynips cerricola is like 
Biorhiza aptera ; Andiricus crispator like Spathegaster 
baccarum; Neuroterus saliens like N. ostreus; A. 
cydome like A. inflator; N. lanuginosus, Cecidomyia 
cerris, and C. circinnans all resemble NV. lenticularis 
and N. fumipennis. Of British forms, Andricus cir- 
culans, Spathegaster albipes, and S. verrucosus are 
similar in form; so also are Andricus globuli, A. 
autumnalis, A. acllavis and A. clementine. Further 
illustrations might be given were it necessary. It is 
also noteworthy that the positions these galls occupy 
on the tree are very similar. 
DISSIMILARITY OF SHAPES. 
(a) Globular = spherical = globulose.—This is a 
somewhat prevalent form, but subject to variation in 
which the opposite poles are depressed, such galls as, 
é.g. Dryophanta agama and D. divisa being termed 
oblate. Examples of C. Kollart are not infrequently 
seen which are as perfectly spherical as though they 
had: been turned on a lathe. Aphilothrix globuli is 
normally true to shape; denuded of its outer green 
rind, it is an almost perfect sphere. 
(b) Ovoid = oviform.—-This term is applied to those 
galls whose long axis considerably exceeds that of the 
short axis. 
Spathegaster albipes typifies this form, although it 
has a small style at the distal end. 
(c) Reniform.—One gall is kidney-like in outline— 
that is Biorhizarenum. Some specimens are very true 
to form; others, however, approximate an ovoid, and 
now and again a globular form will be found. NW. ostreus 
occasionally approaches the reniform shape, and when 
mature, and spots and basal scales are absent, it is 
