126 GOLDSTEIN’S NOMINA NUDA OF CATENICELLIDAE 
necting-tube aperture to a level at about two-thirds of the distance from 
distal to proximal connecting-tube apertures. Forwardly-directed avicularia 
of small size occur rarely. 
Type Material. — Holotype: Balsam mount of fragment with ovicells. 
Nat. Mus. Coll., No. 69249. 
Affinities . — The labelling of Goldstein’s slide indicates that 
he originally confused this form with S. ventricosa (Busk, 
1852), from which it differs notably in the form of the 
gonoecium. The zooecial characteristics are the occasional 
abnormally large avicularia and the inconspicuous distal pair 
of the seven fenestrae. 
Observations . — No slide labelled “monstrosa” occurs in the 
Goldstein series and the identification is based on camera 
lucida drawings, sent me by Sir Sidney F. Harmer, of a 
slide labelled “Catenicella monstrosa ” from the Jelly Collec- 
tion at the Manchester Museum. The label on the holotype 
slide bears the words “Cat. ventricosa ( ventricosa erased) 
with monster avic.,” and thus also supplies a clue to its 
identification. Harmer ’s notes (in litt., 6-vi, 1934) on the 
Manchester specimen confirm the identification. 
The gonoecium of this form illustrates an early stage in 
the evolutionary trend culminating in the modified terminal 
gonoecium which predominates in Scuticellinae. The termi- 
nal gonoecium appears to have been derived from the Vittati- 
cellinid type, where the ovieell pertains to two single zooecia. 
The suggested developmental trend is that the endozooecial 
ovieell gradually became restricted to the proximal zooecium, 
ceasing to overlap the distal zooecium which subsequently 
failed to develop, thus causing the ovicelligerous zooecium to 
terminate a branch. In the gonoecium of this species, homo- 
logues of all the lateral compartments present in a normal 
zooecium are readily recognizable and there is even a sugges- 
tion of the vestige of a distal connecting-tube aperture. 
Bibliogkaphy. 
Bale, W. M., 1922. Two New Species of Bryozoa. Proc. Roy. Soc. Vic- 
toria, n.s., Vol. xxxv, pt. 1, pp. 108-113, pi. viii. 
Busk, G., 1852. Catalogue of the Marine Polyzoa in the Collection of the 
British Museum, Cheilostomata. Part 1, pp. 1-54, pi. i-lxviii. 
Goldstein, J. R. Y., 1882. Some new species of Bryozoa from the Marion 
Islands, with notes on Bicellaria grandis. Trans. Proc. Roy. Soc. 
Victoria, Vol. xviii, pp. 39-46, pis. i, ii. 
Haswell, W. A., 1880. On some Polyzoa from the Queensland Coast. Proc. 
Linn. Soc. New South Wales, Vol. v, pp. 33-40, pis. i-iii. 
