68 
riLISPAESA. 
Dimensions. 
Width of branch 
Thickness of branch 
Diameter of zooecia 
Diameter of aperture 
Fide Pergens. 
•16-’18 mm. 
•08 „ 
B.M., D.4192. 
1 mm. 
•5 „ 
... -16--2 „ 
•10 „ 
Distribution. 
British : 
Middle Chalk : Chatham. 
Foreign : 
Tui'onian : Angouleme, Charente ; Saint-Maure, Indre-et-Loire ; 
Souge and Troot, Loir-et-Cher. 
Figures. 
PI. III. Fig. 7. A fragment of a zoariiim. Middle Chalk : 
Chatham. Fig. 7a, the obverse face, X 9 dia. ; Fig. 7A, part of the 
reverse face of the same, X 9 dia. Vine Coll. D. 4192. 
Affinities. 
M.' Canu has recently proposed a species F. cenomana which he 
describes as differing from F. reticulata in that “les tubes zoeciaux 
sont plus gros et plus saillants.” He quotes two dimensions : the 
internal diameter of the aperture, which is ’ll-’ 12 mm., varying 
therefore from 50 per cent, greater than in F. reticulata down to 
only 10 per cent, greater; M. Canu quotes the diameter of the 
peristome as '17 mm. In the specimen from Chatham here referred 
to reticulata the peristomes vary from '16-'2 mm. in diameter. 
D. 4192. Fragment of a zoarium which may have been reticulate. Upper 
Chalk. Chatham. Gamble Coll. Figd. PI. III. Fig. 7. 
DHREPRESENTED AXD DODBTFUL SPECIES. 
1. contortilis (Lonsdale), 1845. 
Stn. Idmonea contortilis, Lonsdale, 1845. Polyp. New Jersey; Quart. Joum. 
Geol. Soc. vol. i. p. 68. 
Crisisina contortilis, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 265. 
Idmonea contortilis, d’Orhigny, 1853. Bry. Cret. p. 729. 
,, ,, Gahb, 1859. Cat. Cret. : Proc. Acad. Nat. Sci. 
Phil. 1859 [Appendix], p. 19. 
,, ,, Gabb & Horn, 1862. Foss. Polyz. N. Amer. : Joum. 
Acad. Nat. Sci. Phil. ser. 2, vol. v. p. 167. 
Fetepora, sp., Morton, 1834. Sjmops. Cret. p. 79. 
