General History of the Marine Polyzoa. 333 
stomatous genera by its ocecial characters. Its ovicelligerous 
cell differs essentially from the gonwctum or sexual cell which 
occurs amongst the Adeonee. The latter is an enlarged and 
otherwise modified zocecium set apart for reproductive func- 
tions. In the present genus there is a true external ocecium 
or special chamber for the reception of the embryo, but instead 
of being an appendage of the zocecium, as is usual, it is an 
integral. part of it, occupying the whole of the upper (or ante- 
rior) portion of the cell which is inclosed by a ribbed roofing. 
This bears a close resemblance in structure to the front wall 
of the Cribriline zocecium, and like it has originated in a 
modification and adaptation of the marginal spines. 
The morphological history, then, of the ocecium in this 
form is unique and its structural elements differ altogether 
from those which are met with in ordinary species. There is 
certainly a valid claim to generic rank. 
In the absence of living specimens and of specimens 
preserved in spirit it is hardly possible to interpret the struc- 
ture and its functions fully; but we may hope that the 
observations of the Australian naturalists will soon enable us 
to complete the history. 
Ibid. (p. 72 sep.) *. 
Membranipora variegata, sp. N. 
This species appears to be identical with J. echinata, 
d’Orb. (Voy. Amer. mérid. pt. 4, p. 16). D’Orbigny does 
not mention the pedicellate avicularia, and his diagnosis is 
wanting in fulness ; but there can be no doubt that he had 
the present species in view. It will rank as JZ. echinata, 
d’Orbigny. 
Additional Loc. Chili and Peru (d’ Orb.) ; Queen Charlotte 
Islands (Dr. Dawson). 
Ibid. (p. 73 sep.). 
Diuchoris (Beania) distans, sp. n. 
Waters (“ Australian Bryozoa,” ‘Annals’ for August 
1887, p. 94) identifies this species with Diachoris spinigera, 
MacG. He says, ‘‘ There is considerable irregularity in the 
number of spines, and from this specimen I consider that D. 
distans, Hincks, is too closely allied to be separated as a 
species.” 
* See also ‘ Annals’ for February 1882, ser. 5, vol. ix. p. 81 (sep.). 
