ID3I0XEA. 
155 
peristomes. It differs in the first character fi’om 1. alipes, which, 
moreover, has a lower and broader zoarial ridge. 
LIST OF SPECIMENS. 
D. 712. A zoariura identified by Vine as Reptofascigera alfernata. Orb. 
Middle Chalk. Chatham. Vine Coll. Figd. PI. VIII. Fig. 4. 
D. 3840. A zoarium longer and with a lower ridge than D. 712 ; encrusting 
a fragment on Jlicranter (on slide). Middle Chalk. Chatham. 
Gamble Coll. 
? D. 4359. A young zoarium (on slide). Middle Chalk. Chatham. Gamble Coll. 
rXREPRESENTED AND DOEBTFEL SPECIES. 
1. maeandrina (de Loriol), 1868. 
Sy>'. Reptoclausa mceandrina, de Loriol, 1868. Val. Arz. : Pal. Suisse, ser. 4, 
pt. 2, p. 62, pi. vi. fig. 1. 
Char. — A close ally of 1. hagenoici, but with more crowded apertures. 
Distrib. — Valangian : Arzier, Switzerland. 
2. neocomiensis (d’Orhigny), 1853. 
Sy>*. Reptoclausa neocomiensis, d’Orbiguy, 1853-4. Bry. Cret. p. 888, pi. 765, 
figs. 1,2. 
,, ,, de Loriol, 1863. Invert. Mt. Sal. p. 138, pi. xvii. 
fig. 7. 
,, ,, Pergens, 1890. Revision, p. 342. 
Char. — Ridges from 1*5 to 2mm. long; somewhat elliptical. Apertures in 
rows of six ; row^s crowded. Diameter of aperture, ’08 mm. 
Distrib. — Neocomian : Switzerland. 
Aff. — T he oval form of the ridges makes this species appear difierent from the 
type of Idmonea ; but /. hagenoici is an intermediate form. 
3. obliqua (d’Orbigny), 1853. 
Syn. Reptoclausa obliqua, d’Orbigny, 1853-4. Bry. Cret. p. 888, pi. 765, 
figs. 3-6. 
,, ,, Pergens, 1890. Revision, p. 342. 
Char. — Ridges short and oval ; apertm'es in rows of three, and •08 mm. in dia. 
Distrib. — Senonian : France. 
The following nomina nurla have been proposed. In the absence 
of any descriptions it is impossible to refer the species to their 
genera or subgenera. 
aculeata, von Hagenow, 1851. Bry. Maastr. Kr. p. 25. 
bifida ,, 1850. In Geinitz, Quadersandst. p. 238. 
1851. Op. cit. p. 25. 
1850. ,, p. 238. 
dimidiata 
