280 
On the Bryozoa of the Bay o f Naples. 
the tube is much lengthened by the sheath of the polypide, 
which is continuous with the outer cover. The tentacles are 
numerous, thirty to forty. This species being semitransparent, 
the position of the polypides can be seen, as figured ; and it 
would probably well repay physiological examination in 
detail. 
Hab. Dominica (Ell.) ; Brazil; Archipel de la Chine 
(Tilesius ?, teste Lamour .); Adriatic (Hell.) ; Naples, on sea¬ 
weed, from slight depths, rare. 
There is a specimen in the British Museum with similar 
zooecia; but the fronds are narrow, as in Flustra truncata. As 
my attention was directed to calcareous forms, I have but few 
Ctenostomata, and am not in a position to discuss that group. 
Zoobotryon pellucidus,YA\x., lias been found in great abun¬ 
dance in the Bay; but during my stay none was brought in. 
The Entoprocta from Naples have been physiologically 
studied by Nitsche and others; Pedicellina ecliinata is not 
uncommon; of Loxosoma four species (Kefersteinii, Clap.; 
alata , Barr. ; raja, O. Sell.; neapolitana , Kow.) are known 
from the Bay. 
Since writing Part I., I have found among the material 
brought home:—112. Lepralia Ilyndrnanni ; 113. Caberea 
Boryi , Aud. 
Although the total number is now large, I am convinced it 
could be most materially increased; for when I was in Naples 
I had none of the most important works to refer to, and was 
not sufficiently acquainted with the Bryozoan characters; con¬ 
sequently doubtless many species escaped my attention. And 
a collection made in one winter would of necessity be imper¬ 
fect ; for forms sometimes abundant, at others are not met 
with. 
The wide distribution of many species must strike any one 
making careful comparison—and also the large number which 
occur fossil, not only in the younger Tertiaries, but also in the 
Miocene and Eocene. Within a day’s row from Naples there 
is no water deeper than 40 fathoms; but at this depth in the 
Secca the dredge came up full of sponges, Holothuria, &c., and 
a great number of Bryozoa, mostly Hornera , ldmonea , Enta- 
lophora, and Eschara. These apparently resemble in facies 
the fauna found in most places at a greater depth. And this is 
of great importance geologically ; for the conclusion seems to 
be that, in a closed sea like the Mediterranean, where there is 
no tide, these animals can flourish at a less depth than they 
would with more disturbance of the water. It is therefore 
not justifiable to conclude that, where a plentiful fossil Bryo¬ 
zoan fauna occurs, of necessity the depth was. very great. 
