A Revision of the Jurassic Bryozoa. 447 
LXII.—A Revision of the Jurassic Bryozoa.—Part I]. The 
Genus Proboscina. ,By J. W. Gregory, D.Sc., F.G.S. 
[Continued from vol. xv. p. 228. } 
Family Tubuliporide (continued). 
Genus Progosctna, Audouin, 1826. 
Diagnosis.—Tubuliporide in which the zocecia form flat 
adnate multiserial zoaria. The zoaria are mainly in linear 
bands, which may or may not branch. ‘The zocecia are 
tubular. The peristome is either flush with the surface of 
the zoarium or somewhat raised. 
Type species: P. Boryi, Audouin. 
The retention of this genus is somewhat reactionary, for 
most authors now place it as a synonym of Stomatopora, 
Berenicea, Diastopora, or even Entalophora. It is certainly 
nearest to Stomatopora and Berenicea, between which it 1s 
intermediate. Pergens* has described a specimen which 
begins as a Diastopora, then gives rise to branches of Pro- 
boscina, and these end as Stomatopora ; and upon the evidence 
of this specimen he merges the two latter. This specimen, 
however, proves either too much or too little. If its evidence 
is to be accepted, then the three genera ought to be united. But 
Pergens retains Stomatopora as distinct from Diastopora in 
spite of it. 'T'o do otherwise would be practically to abandon 
the use of genera in the Cyclostomata. I frankly admit that 
there are specimens intermediate between Proboscina and 
Diastopora on the one hand, and between the former and 
Stomatopora on the other: nevertheless, there is a large group 
of species which exhibit the characters of the above diagnosis, 
and the genus is therefore a convenient one; and to expect 
genera of Cyclostomata to be more than convenient groups of 
species, seems hopeless at present. Proboseina is therefore 
accepted as a genus which differs from Stomatopora by having 
a multiserial zoarium, and from Berenicea by having its zocecia 
arranged in bands instead of in broad sheets. 
1. Proboscina Eudesi, Haime, 1854. 
Proboscina Eudesi, J. Haime, 1854, Jur. Bry., Mém. Soe. géol. France, 
sér, 2, t. v. p. 167, pl. vi. figs. 9a, b. 
* E. Pergens, “ Revision des Bryozoaires du Crétacé figurés par 
d@’Orbigny, Part I. Cyclostomata,” Bull. Soc. belge Géol. t. ii. 1890, 
Mém, p. 327. 
32* 
