CEISIXA. 
165 
D. 3132. A biserial fragment of var. triangularis. Upper Chalk. Kent. 
Simmons Coll. 
D. 1882. A fragment with apertures in series of 2-3. Upper Gi’eensand. 
Cambridge. Eecorded by Tine as Idmonea dorsata. Jesson Coll. 
Foreign. 
D. 3694. Five fragments of zoaria. Craie chloritee. Le Mans. Tesson Coll. 
D. 1320. Five imperfect worn specimens (on slide with a fragment of an 
indeterminable Cenomanian: Craie chloritee. Le 
Mans. Vine Coll. 
D. 3727. Two fragments of var. triangularis, Orb. (on slide). Senonian. 
L ’Arche de Leves. Gamble CoU. 
D. 4668, D. 4670. Fragments of var. triangularis, Orb. (on slides). 
Turonian : Craie marneuse. North of Les Roches, Loir-et-Cher. 
Purchased 1898. 
D. 4669. Two branches of var. triangularis. Orb. (on slide). Senonian — 
Coniacian : Craie de Yilledieu. South of Les Roches, Loir-et- 
Cher. Purchased 1898. 
D. 4666. A branched fragment of var. Orb. (on slide). Senonian — 
Coniacian : Craie de Yilledieu. South of Les Roches, Loir-et-Cher. 
Pm'chased 1898. 
3. Crisina marginata (d’Orbigny), 1853. 
Synonymy. 
Idmonea marginata, d’Orbigny, 1853. Bry. Cret. p. 744, pi. 749, figs. 20-23. 
,, ,, Pergens, 1890. Revision, p. 344. 
,, ,, Pergens, 1895. Bry. Arche de Leves: Bull. Soc. beige 
Geol. vol. viii. p. 134. 
,, lata, d’Orbigny, 1853. Bry. Cret. p. 734, pi. 748, figs. 6-10. 
,, excavata, d’Orbigny, 1853. Ibid. p. 742, pi. 749, figs. 11-15. 
,, ,, Hamm, 1881. Bry. mastr. Ob. -Sen. p. 31. 
Diagnosis. 
Zoarium with dichotomous branches which are flat or concave on 
the reverse side, ridged or rounded on the obverse. 
Zocecia of medium size. The rows of apertures include fi’om 
three to eight. Peristomes low. 
Dimensions. 
Diameter of branch 
Diameter of zocecia 
Diameter of aperture 
Distance of transverse row's 
Fide Pergens. 
1 mm. 
•14 „ 
•06 ,, 
•3— *34 
