326 
MELICEEITITES. 
Figuees. 
Fig. 38a, part of a specimen showing some well-preserved 
zooecia; Fig. 38 part of another specimen with suboral bar as in 
Goldfuss’ figure : X 15 dia. Essen Greensand : Essen. Old Coll. 
D. 3638. 
a b 
Fig. 38 . — Blelicentites gracilis (Goldf.). 
Affinities. 
The synonymy of this species is somewhat complex. Goldfuss 
founded it on a worn branch which does not show the apertures ; 
but that they had a thickened lower lip is probably owing to the 
occurrence of a suboral bar, which is no doubt the strong lower 
part of the peristome. Romer figured a well-preserved specimen 
which shows that the apertures are small and trigonal. Michelin 
identified as this species a specimen fi’om Le Mans, which d’Orbigny 
in 1853 renamed M. cenomana. 
The Senonian representative of this species is M. roemeri (Hag.), 
with better developed avicularia. The open triangular apertures 
of the avicularia in M. gracilis are indicated in a Museum specimen, 
but the evidence is not very satisfactory. Confirmation of this 
character is needed. 
LIST OF SPECIMENS. 
D. 3638. Two specimens retaining the front wall in places ; in other parts 
the front wall has been broken, and the lozenge -shaped aperture 
is crossed by the suboral bar (as in Goldfuss’ original figure). 
Cenomanian : Essener Griinsand. Essen- am -Euhr, Westphalia. 
Old Coll. Figs. Z8a, b. 
60,554. A series of fragments. Cenomanian. Essen. Purchased 1877. 
D. 3636. A series of specimens, mostly worn. Cenomanian. Essen. Old CoU. 
? D. 3637. Fragment of a reticulate zoarium (on slide). Cenomanian. Essen. 
Old Coll. 
