Bryozoa of the Bay of Naples. 
119 
Loc.. Eocene: Grignon, Parnes (Mich.). Oligocene : Lat- 
dorf and Val di Lonte. Miocene : many localities in Austria 
and Hungary. Pliocene : Asti, Pisa, Castellarquato, Rhodes. 
Living: Adriatic (H.), Aegean (R.), Indian Ocean ( Beuss). 
There is a specimen in the British Museum from Dr. Bower- 
bank’s collection from Australia, in which I do not see any 
difference from the Naples specimen; but I should not like to 
speak positively unless I have the opportunity of detail-ex¬ 
amination. Naples, 40-50 fathoms. 
46. Flustra truncata , Linn. 
Escliara securifrons, Pall. Flench. Zooph. p. 56. 
Flustra securifrons , Smitt, Krit. Fort. 6 . Sk. Hafs-Bry. 1867, pt. iii. 
p. 358, pi. xx. figs. 6-8. 
Flustra truncata , Busk, Cat. Mar. Polyz. p. 48, pi. lviii, figs. 1, 2, and 
pi. lvi. figs. 1, 2. 
Although no spines are apparent when a colony is ex¬ 
amined, thin transverse sections show two microscopical spines 
near the oral aperture. 
This, like Flustra papyrea , is found occasionally on the 
back of Pisa armata , and also in dredging from 40 fathoms in 
the Secca. Occasionally the avicularia are placed diagonally. 
Rosette-plates, four distal and eight lateral. 
Ilab. Spitzbergen, Scandinavia (all depths), Britain, At¬ 
lantic, Adriatic ( Heller ), Australia (Busk). 
47. Flustra papyrea, Pall. 
Carbasea papyrea, Busk, Cat. Mar. Polyz. p. 50, pi. xlix. figs. 1-3 (?). 
Flustra papyrea, Smitt, Kr. Fort. 6. Sk. Hafs-Bry. pt. iii. 1867, p. 359, 
pi. xx. figs. 9-11. 
Plates 49 and 50 of Mr. Busk’s catalogue have evidently 
been changed, requiring renumbering of the plates or altera¬ 
tion of the text. 
This is very common upon a crab (Pisa armata ), which 
usually carries a small colony of this Flustra on its back. I 
do not remember seeing any at Naples except from this 
crab. 
There is one distal and usually two lateral rosette-plates *. 
Hab. Arctic seas at various depths (Sm.), Britain, Adri¬ 
atic (Heller). 
Although specially on the look-out for Flustra foliacea , I 
was surprised not to find any. 
* In Flustra armata , pi. 50. fig. 4, of Brit. Mus. Cat., the rosette-plates 
are shown but are not mentioned. 
