271 
Bryozoa of the Bay of Naples. 
portion. The end fronds have only two cells in each series, 
while the older portions have usually four or five. The series 
are 0*4 millim. or slightly wider apart, with very long and 
raised cells. 
Fragments of such a form, if found fossil, would probably 
be made into more than one species. 
Living: Adriatic (if.); Naples, 40 fathoms, not very 
common. 
89. Idmonea tr if oris , Heller. 
Idmonea tr if oris, Heller, Die Dry. des Adriat. Meeres, p. 120. 
This is a smaller and more delicate species than the last, 
and is distinguished by having three cells in a series. These 
are 0*5 millim. or more apart. The dorsal surface is concave, 
with the ends convex. 
Hab. Adriatic, 20-55 fathoms (H.) ; Naples, 40 fathoms, 
rare. 
90. Idmonea concava , Reuss. 
Idmonea concava, Reuss, Die foss. Anth. und Bry. del' Schicht. von 
Crosaro, Denksclir. k.-k. Ak. Wien, vol. xxix. p. 70, pi. xxxv. figs. 3, 4. 
The dorsal surface is distinctly striated and usually slightly 
concave; but the growing ends are convex. 
The zoarium, after growing straight for about 7 millims., 
divides dichotomously at an angle of about 00°, and some¬ 
times divides again after growing for about 4 millims. There 
are usually four cells in a series; the cells are long and pro¬ 
ject laterally ; the series are a little more than half a millim. 
apart. 
This corresponds with specimens I have from the Val di 
Lonte, &c. 
Loc. Miocene: Val di Lonte, Montecchio-Maggiore (Bss.). 
Living : Naples, 40 fathoms. 
91. Tubulipora serpens , Linn. 
Tubulipora serpens, Smitt, Krit. Fort. of. Sk. H.-Bry. I860, p. 396, 
pi. iii. figs. 1-5, pi. ix. figs. 1, 2. 
Idmonea serpens, Manzoni, Bry. foss. Ital. cont. 4, p. 27, pi. vi. fig. 32, 
et I Bri. del Plioc. di Castrocaro, p. 42, pi. vi. fig. 78. 
Obelia tubidifera, Lamx. Expos. Meth. p. 81, pi. lxxx. figs. 7, 8. 
The specimens I have arc adnate on seaweed and are only 
from 3-G millims. long, commencing with a single zooecial 
tube. The colony rapidly widens; on each side of the median 
line much raised regular series with six cells in a series ; 
cells closely joined. Some specimens divide dichotomously. 
This is smaller and more regular than T.phalangea, which 
has the zooecial tubes free at the end. 
