HAPLOCECIA. 161 



presented by the branches when eroded. The greater width of the 

 apertures in the specimen figured in the Catalogue of the Bryozoa 

 of the York Museum (Fig. 12), is due to the wearing away of 

 the raised peristomes. 



LIST OF SPECIMENS. 



D. 750. Millepore Limestone. Near Scarboro'. Bean Coll. 



D. 751. 



B. 4875. Inferior Oolite. Loc. ? Holl CoU. 



B. 4566. Bathonian Calcaire a polypiers. Ranville. Fig. 11, p. 158. 



B. 4867. Lower Oolite. France ? Mantell Coll. 



D. 2109. Millepore Limestone. Gristhorpe. Presented by J. "W. Gregory 



(a slide with three specimens, of which one shows the zooecial 



characters) . 



D. 2202. In block of limestone. Millepore Limestone. Gristhorpe. BrodieColl. 

 D. 2203. In pieces of limestone. ,, ,, ,, ,, 



D. 2204. Fragments and slide. ,, ,, ,, ,, 



D. 2191. Inferior Oolite. Near Leckhampton. Brodie Coll. 



2. Haplooecia irregulare, Gregory, 1896. 



[Rev. pt. v. : Ann. Mag. Nat. Hist. ser. 6, vol. xvii. p. 200.] 



DIAGNOSIS : 



Zoarium composed of small, cylindrical stems, which dichotomize 

 irregularly, and usually at short intervals. 



Zocecia usually hexagonal, but occasionally heptagonal or pen- 

 tagonal ; often irregular. Zooecia irregularly quincuncial in 

 arrangement. Apertures large, circular (or, when worn, trans- 

 versely elongate). Front wall coarsely punctate. 



DISTRIBUTION. 



BRITISH : 



Great Oolite : Ancliff, near Bath. 



Lincolnshire Limestone : Stamford. 

 FOREIGN : 



Bathonian : Normandy. 



Description of Figure. PL IX. Fig. 3. Fragment, x 24 dia. 

 Lincolnshire Limestone : Stamford. S. Sharpe Coll. D. 44. 



Affinities. This species is separated from the former one by the 

 irregularly quincuncial arrangement of the zooacia. 



