68 PEOBOSCINA. 



DIAGNOSIS : 



Zoarium formed of loose, flabelliform, Stomatopora-like> tufts; 

 these may radiate from a centre, to form a circular zoarium. The 

 branches begin uniserially, and may end in sheets containing 

 twelve zooacia in width. 



Zocecia regularly cylindrical. Front wall ornamented by a 

 transverse wrinkling. Of medium length, broad. 



Peristomes with somewhat thickened rims. Slightly raised. 



Formula p, c, I, r= 1, 0, 1, 1-3. 



DISTRIBUTION. 

 ENGLAND : 



Fuller's Earth : Bruton. 



Cornbrash : Chippenham ; Corsham. 



Description of Figures. PL II. Fig. 4. Part of a colony 

 encrusting Zeilleria ornithocephala (J. de C. Sow.), X 17 dia. 

 Fuller's Earth : Bruton. Cunnington Coll. 88742. PI. II. Fig. 5. 

 One sector of a circular colony encrusting Terebratula maxillata, 

 J. de C. Sow., showing terminal expansions of the branches, 

 X 10 dia. Cornbrash : Corsham, Wiltshire. W. Buy Coll. 

 No. 23852. 



Affinities. This species is well characterized by its loose Stoma- 

 topora-like zoarium. Some branches end in sheets, and these ally 

 it to P. rigauxi (Sauv.). From this, however, it may be distin- 

 guished by the looseness of the zoarium. Its nearest ally is the 

 recent P. major (Johnst.). (See Hincks, Brit. Mar. Polyz. p. 427, 

 pi. Iviii.) This, however, has a formula 2, 0, 2, 1-4, and may 

 be distinguished by the greater elevation of the peristomes and 

 length of the zooscia. 



The species is named after William Cunnington, Esq., from 

 whom the British Museum received the specimen taken as 

 the type, and whose careful collection has added greatly to the 

 knowledge of Jurassic paleontology. 



LIST OF SPECIMENS. 



88742. On Zeilleria ornithocephala (J. de C. Sow.). Fuller's Earth. Bruton. 



Cunnington Coll. 

 97617. On Terebratula maxillata, J. de C. Sow. Cornbrash. Chippenham. 



Waterhouse Coll. Presented by Sir E. Owen. 

 23852. On Terebratula maxillata var. submaxillata, Morr. Cornhrash. 



W. Buy Coll. 



