of South Devon and South Cornwall. 805 
The C. avicularis, however, is well marked and readily recog- 
nized. The cells are crowded, erect, uneven, some being elevated 
considerably above the others; the orifice orbicular above, with 
a pointed sinus below; the peristome elevated into a border, and 
rising in front into a rostrum, which bears an oval avicularium 
on one side of it; ovicell prominent, subglobose, punctured— 
generally an ascending process on each side of it, bearing a 
small oval avicularium ; here and there amongst the cells, large 
mounted avicularia, with broad triangular mandible; spatulate 
avicularia distributed over the surface of the polyzoary. The 
number and variety of the avicularian appendages in this species 
are remarkable. 
Numerous circular apertures are distributed over the poly- 
zoary amongst the cells. 
5. C. tubigera, Busk, ‘ Crag Polyzoa,’ p. 60, pl. 22. fig. 2. 
To this species I refer (not without some doubt) two specimens 
obtained from Plymouth. They form subconical masses, the 
surface of which is covered with irregular prominences. The 
cells are distant and very distinct, sometimes connected by 
ridges, punctured round the orifice; orifice orbicular, with a 
sinus below; a process in front, bearing, near the top, an oval 
avicularium ; occasionally amongst the cells other stouter pro- 
cesses, supporting larger avicularia; spatulate avicularia nu- 
merous. 
Section 8. Erect, branching. 
6. C. ramulosa, Linneus. 
Very common, on Zoophytes from deep water: off Exmouth 
(fine) ; Cornwall (30 fathoms), &c. 
7. C. dichotoma, n. sp. Pl. XII. figs. 7, 8, 
Polyzoarium slender, narrowed towards the base, dichotomously 
branched ; branches cylindrical, tapering towards the extremi- 
ties, pointed ; cells ovate, ventricose, smooth ; orifice orbicular 
above, slightly produced below, in front of it a short and tumid 
rostrum, with a small avicularium on one side of it, near the 
top; ovicell globose, silvery, covered in front with punctures, 
the margins of which are raised ; occasionally a spatulate avi- 
cularium on one side of the orifice; numerous minute sub- 
circular avicularia distributed amongst the cells. The surface 
of the polyzoary is pierced by circular orifices, which occupy 
the intercellular spaces. 
On Zoophytes from 30 fathoms, off Polperro, 
[Ireland.] 
