REPORT ON THE POLYZOA. 
13 
row of dots down each interspace. Zooecia (OT mm.), usually four in each series, of 
uniform length, except the innermost, which is the longest ; series 0'4 to 0'5 mm. apart. 
Habitat. — Station 186, off Cape York, 8 fathoms, coral mud. 
The collection affords only a single such specimen, but apparently mature, inasmuch 
as two of the branches are widely dilated at the second bifurcation into an elongated, 
deeply immersed ooecial chamber. 
§ f3. (subgenus Tervia). — The outermost zocecium in each lateral series the longest ; 
scattered zooecia opening irregularly in the space between the lateral series. 
Tervia, Jnllien, Bull. Soc. Zool. de Prance, vol. vii. p. 500, 1882. 
(6) Idmonea milneana, d’Orbigny. 
Idmonea milneana, d’Orb., Yoy. Amer. Merid., “Polypiers” p. 20, pi. ix. figs. 17-21; 
Palseont. Franc., p. 732 ; Smitt, Florid. Bryoz., p. 8, pi. iii. figs. 14-17 ; Macgilliv., lor,, cit., 
Dec. vii. p. 29, pL Ixviii. fig. 1; Busk, Brit. Mus. Cat., pt. iii. p. 12, pi. xi. ; Waters, 
Haswell, Ridley. 
? Idmonea trans versa, Milne-Edw., loc. cit., p. 26, pi. ix. fig. 3. 
Character. — Zoarium spreading from a central peduncle, branching dichotomously. 
Branches depressed, broad, flattened or slightly rounded behind, 0‘8 to 1‘5 mm. wide; 
surface thickly punctate ; on dorsal aspect irregularly striated longitudinally, and, except 
in the younger part, transversely wrinkled. Zooecia about (P2 mm. in diameter, usually 
four or more in a series, the outer the longer ; a few intermediate zooecia opening in the 
space in front between the lateral series ; series 0’6 to 1 mm. apart. Ooecial chamber? 
Habitat. — Station 75,lat. 38° 38' N., long. 28° 28' 30" W., 450 fathoms, volcanic mud. 
Station 151, off Heard Island, 75 fathoms, volcanic mud. Off Prince Edward Island, 80 
to 150 fathoms. 
[Port Philip Heads, 10 to 15 fathoms, Macgilliv.; Falkland Islands, d’Orbigny; coast 
of Tierra del Fuego, and Patagonia, 30 fathoms; Chonos Archipelago, Darwin; Port 
Jackson and Queensland, Haswell.] 
The cells, as Mr. Macgillivray observes, are usually four in series, the inner the least 
prominent, the others gradually increasing in length to the outer, which projects very 
much. They are united side to side throughout almost their whole length, so as to form 
regular walls, rising up and projecting far beyond the sides of the branches. As in 
several other species of Idmonea numerous radical tubes are given off from the back of 
the branches by which the growth is attached. The anterior median single zooecia are 
few in number and usually nearly level with the surface. Idmonea milneana belongs to 
the group for which M. Jullien has proposed the name of Tervia, characterised by the 
