198 
EETECJLTA. 
Figuee. 
Fig. 17. Part of a branch from the side, X 20 dia. Upper 
Chalk : Magee Island. Presented by Jos. Wright, Esq. D. 3273. 
Fig. 17 . — Itetecava carinata (Rom.). 
Dimexsioxs. 
Width of a branch 
Thickness of the same 
Diameter of zooccia ... 
Diameter of aperture 
Distance of transverse series 
of apertures 
Fide Pergen.s. 
B.M., D. 32' 
•o-3’0 mm. 
•80 mm. 
•5-3-0 ,, 
•85 
•14--18 „ 
•1--15 ,, 
•06 ,. 
•07--1 „ 
•4--6 ,, 
•4 „ 
Affinities. 
This ‘ species ’ appears to be most closely allied to R. lichenoides ; 
the distinctions between them are stated on p. 196. I. sulcata 
shows the worn conchtion, but according to Hamm is a synonym of 
R. pseudodisticha. 
LIST OF SPECIMENS. 
British. 
D. 3273. Fragment (on slide). Between Black Head and Gohbins, IMagec 
Island. Presented by Jos. Wright, Esq. Fig. Xo. 17. 
Foreign. 
D. 1373. Three fragments (on slide). Maastrichter Kreide. Maastricht. 
Vine CoU. 
D. 3758. Three fragments of form sulcata (on slide). Maastrichter Kreide. 
Mont St. Pierre, Maastricht. Gamble Coll. 
D. 4667. Two fragments of form sulcata (on slide). Senonian — Coniacian : 
Craie de Villedieu. South of Les Roches, Loir-et-Cher. Purchased 
1898. 
D. 3297. A well-preserved zoarium of form sulcata. Maastrichter Kreide. 
Maastricht. Van Breda Coll. 
