80 
OSCULIPOlilD^. 
crude and his reference to it inadequate, Lonsdale’s elaborately 
figured species may be allowed to stand. For Mantel I’s figure is 
open to the doubt that it does not show the generic characters, and 
can only be recognized by accessory features. Mantell’s MiUeporn 
dichotoma appears to he a terminal fragment of the .same species. 
Yon Hagenow’s Retepora costata is another name that lias claims 
to consideration for this species. It was given in 1 840 to a Bryozoon 
from Eiigen that was briefly described but not figured. The 
description indicates that it is a llomceosoh)}, with compressed, 
thick stems, with a smooth obverse face crowded with jiores, and 
a longitudinally ribbed reverse surface. The branchlets are 
described, however, as irregular and reflexed, whereby it differs 
from H. ramulosus, in which they lie in the same plane as the 
stem from which they come. The Laur Collection in the Museum 
includes a few fragments of a Homoeosolen, which, though they do 
not show the reflexed branchlets, probably belong to von Hagenow’s 
R. codata. Owing to this uncertainty Lonsdale’s name may well 
be retained, as with the evidence available in 1850 he would not 
have been justified in identifying his species with the R. costata 
of von Hagenow. 
LIST OF SPECIMENS. 
D. 2945. 
D. 2950. 
B. 4492. 
B. 4493. 
D. 407. 
The type-specimen and part of the same isolated to show both surfaces. 
Upper Chalk. Gravesend. Bowerbauk Coll. Figd. Lonsdale in 
Dixon, Geol. Sussex, pi. xviun, fig. 3. The branches are U mm. 
wide ; obverse tumid, back flat ; branches may extend for 15 mm., 
with branchlets on one side of the stem only. 
A paratype. The specimen figured by Lonsdale, op. cif. pi. xviii b, 
fig. 5. The specimen shows only the reverse face ; the largest 
branches are 18 mm. long ; most of the branches are long and 
wavy in course ; a few have no sub-branches, but most of them 
three or five sub-branches in a length of 5 mm. The diameter of 
the branches is "5 mm. Chalk. Sussex. Dixon Coll. 
Paratype. This section shows that the small pores appear to be young 
zooecia, as they pass up gi’adually to mature zooecia. Upper Chalk. 
Loc. ? Figd. by Lonsdale in Dixon, Geol. Sussex, pi. xviii b, 
fig. 45. Dixon Coll. 
Paratype. A fragment sho'wing lateral sections. Upper Chalk. Loc. ? 
Figd. by Lonsdale in Dixon, Geol. Sussex, pi. xviii b, figs. 4c, d. 
Dixon Coll. 
Three specimens (on slide). One is a weU-preserved zoarium with 
short, bent, hook-like branchlets ; a large gonoecium on the obverse 
surface. Middle Chalk — zone of Micraster cortestudinarium . 
Chatham. Gamble Coll. Fi?d. PI. III. Fig. 7. 
