256 VINE : NOTES ON POLYZOA FROM THE CORNBRASH OF THRAPSTON. 
2. Proboscina divisa, sp. n. PL (XIII), figs. 8, 8a. 
Zoarium fenestrate, much branched, narrow ; branches anasto- 
mosing at frequent intervals. Zocecia elongated, or stunted, generally ' 
from two to three, on the surface of the branches ; but occasionally 
the cells are irregularly clustered together in places where the branches 
divide, and form a fenestrule. 
Locality and Habitat : Cornbrash, Thrapston. 
The examples of this species are by no means abundant, and 
though I have frequently met with fenestrated Proboscinse in other 
horizons of the Jurassic rocks, forms similar in any sense to the one 
described above are extremely rare, even in the Cornbrash rocks of 
Thrapston. 
Proboscine Clementina, Vine. (Proc, Yorksh. Geol. Soc, vol. xii., 
p. 154, pi. vi.,fig. 2.) 
3. ,, var. minuta, var. n., PI. (XIII.), 9, 9a, 9h. 
Zoarium, fan-shaped, or flabellate, delicate, originating from an 
" egg-cell." Zoaicia, contiguous, adherent by their bases only, the 
upper parts of the cells slightly elevated and rounded ; partially 
free towards the orifices, the peristomes turned upwards ; surfaces of 
Zooecia striated transversely. The basal part of the cells occasionally 
distended, or pointed, just above the aperture, (PI. (XIII.), fig. 9b.) 
Horizon and Locality . Cornbrash, Thrapston, Northampton. 
Except in the size of the colony, these two Cornbrash Proboscinw 
closely resemble the Gault forms already described by me in a former 
paper (Proc. Yorksh. Geol, Soc, vol. xi.,pl. ii.,p. 154). The distin- 
guishing feature in the Zooecia of the Jurassic forms, however, merits 
recognition and description. 
Proboscina Clementina. Vine. 
4. „ Var. depressa, var. n. 
The beautiful and delicate variety described above ( P. Clementina, 
var, minuta), is the form more generally met with encrusting Corn- 
brash Fossils ; but there are several other varieties which would merit 
distinction if a more critical diagnosis were adopted. One peculiar 
example, however, in my possession, has the Zooecia rather more 
robust and depressed than in the var. minuta (No. 3, ante.). This 
may be the result of habitat only, but even this difference may be 
recognised advantageously. 
