VINE : NOTES ON POLYZOA FROM THE CORNBRASH OF THRAPSTON. 255 
and text of Stomatopora dilatans (Brit. Mar. Polyzoa, p. 420, pi. 
lvii., figs. 3, 3a), in which the position of the " egg cell " is a very 
'characteristic feature of the species. 
The British Jurassic species of Proboscina heretofore described 
are few in number. Up till 1852 only four Jurassic forms were 
referred to the genus by d'Orbigny. Jules Haime, in his Monograph 
of the Jurassic Fossil Bryozoa, only records five species as legitimate 
members of the group ; the four species of d'Orbigny are placed in 
the doubtful list, but only one of the species described by Haime is 
placed on the British list. 
1. Proboscina Davidsoni Haime (op. cit., p. 167, pi. vi., fig. 11, 
a,.b). 
Mr. E. A. "Walford, in his valuable paper " On some Bryozoa 
from the Inferior Oolite, &c, of Dorset," (Quart. Jour. Geol. Soc, 
Aug., 1889) adds considerably to our knowledge of British forms, 
both specific and varietal. 
2. Proboscina spatiosa, Walford (op. cit., p. 566, pi. xvii., figs. 1-3.) 
3. ,, ,, var. brevis, Walford (op. cit., p. 567, pi. xviii., 
figs. 1-2.) 
4. „ ,, „ brevior, Walford (op. cit., p. 567, „ „ 
figs. 3-5. 
5. „ inconstans, Walford (op. cit., p. 567, pi. xvii., figs. 4-6.) 
The following Cornbrash species must now be added to this 
meagre Jurassic list : — 
1, Proboscina obscura, sp. n., pi. (XIII.), figs. 7-7 b. 
Zoarium zigzag or serpuliform, wholly adherent by the base, but 
slightly raised in the middle portion. Zocecia stunted, or partially 
obscured in certain portions of the zoarium, or developed, Idmonea 
like, on other portions ; irregularly disposed and occasionally elongated; 
surface transversely banded or punctured, aperture circular, placed at 
the extremity of the cell ; peristome thin. Ooecium ? Lepralia like, 
slightly distended in the'central portion, and punctured in transverse 
lines across the surface. 
Horizon: Cornbrash, Thrapston. 
The example is unique, and it differs in many respects from all 
the other species met with in my Cornbrash material ; but more espe- 
cially in the Lepralia-like form of the Ocecium. 
