24 Rev. T. Hincks’s Catalogue of Zoophytes 
This species, when growing on shells, is not uncommonly re-~ 
cumbent and adnate, and creeps over the surface like a Hippo- 
thoa. It is a curious fact that in this condition it assumes 
the mode of growth of the latter genus, and sends off branches » 
from the sides of the cells. The aperture, too, is not distinetly 
marginated, as in the erect form. . 
I have many specimens of this variety, which were dredged off 
the Isle of Man, where it is common on oyster and other shells. 
They form Hippothoa-like patches, and generally show the pro- 
cess, springing from the front of the cells (below the aperture), 
which marks the commencement of a branch or of an ovicelli- 
gerous cell. So completely are the habit and aspect of. the 
Polyzoon changed in this repent variety, that it is difficult to 
recognize it under its disguise. When I first met with it, I had 
no doubt that I had obtained a new species of Hippothoa; but I 
have since found a specimen in which an erect shoot of the nor- 
mal character springs from the line of creeping cells. 
I have Scruparia chelata in the same condition from Australia, 
where the species is common. 
2. HirrotnHos, Lamouroux. 
1. H. catenularia, Jameson. 
Very common in deep water: spreads profusely over the 
Cornish Pinne from 60 fathoms. 
2. H. divaricata, Lamx. 
Very common: from between tide-marks (rarely) to deep 
water. Some of the most beautiful specimens which I have seen 
were spread over the smooth inner surface of the Pinna ingens. 
The variety Patagonica occurs on red weed at Sidmouth. 
[Hobson’s Bay, Australia. ] 
3. Area, Lamouroux. 
1. 4. anguina, Linneus. 
Extremely common: on Alge (especially the red), Corallines, 
&c., in tide-pools, and the Laminarian zone. 
2. Ai. truncata, Landsborough. 
On shells, apparently not common: Plymouth, &c. 
In his description of this species, Dr. Landsborough makes 
no mention of the curious spur-like processes with which the 
cells are often furnished. They spring from the back of the 
cell below the aperture, and are generally of considerable length. 
(Ramsay, Isle of Man; common.] 
