EEPTOCERITITES. 
319 
6. simplex, d’Orbigny, 18o3. 
Syx. Jlultelea simplex, d’Orbigny, 1853. Bry. Cret. p. 648, pi. 739, figs. 17-19. 
,, ,, Peron, 1888. Craie Auglo-Par. : Bull. Soc. Sci. nat. 
Youne, vol. xli. p. 225. 
,, ,, Pergens, 1890. Eevisiou, p. 399. 
,, ,, Pergens, 1893. Bry. St. Pat. : Bull. Soc. beige Geol. 
vol. vi., Pr. Yb. p. 212. 
Char. — Founded, according to Pergens, on an indistinct specimen. Apertures 
described by d’Orbigny as small and round; the peristomes are raised and 
bead-like. Apertures irregularly qiiincuncial in distribution. 
Distrib. — Senonian — Campanian : Rbeims and Epernay. 
Turonian or Coniacian : Souge and TrOot, Loir-et-Cher ; St. Paterne, 
Indre-et- Loire. 
REPTOCERITITES,^ nov. 
Diagnosis. 
Eleidae with a Berenicoid zoarium of a single, adnate layer of 
zooecia, Avicularia and some closed zooecia occur. 
Affinities. 
This genus differs from Reptelea hy the presence of avicularia. 
It is the simplest zoarium of the Meliceritites section of the Eleidae. 
Its nearest ally is the miiltilamellar genus Reptomultelea. 
Type Species. 
Reptoceritites rowei, Middle Chalk : Chatham. 
Reptoceritites rowei, nov. 
Diagnosis. 
Zoarium elliptical or reniform. 
Zooecia irregularly arranged. The peristomes are well raised. 
The aperture is almost terminal, and often circular : it is 
sometimes suhtriangular. 
Aricularia long ; the depression for the mandible is hastate, 
or may be expanded at both ends, and is twice the length of 
the zooecial ajiertures. 
^ The reptant form of Meliceritites. 
