REPORT ON THE POLYZOA. 13 



rotv of dots ■ down each interspace. Zooecia (O'l 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 aifords 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. 



§ fi. (subgenus Tervia). — The outermost zocecium in each lateral series the longest ; 

 scattered zocBcia opening irregularly in the space between the lateral series. 



Tervia, JiiUien, Bull. Soc. Zool. de France, vol. vii. p. 500,' 1882. 



(6) Idmonea milneana, d'Orbigny. 



Idmonea milneana, d'Oih., Voy. d. I'Amdr. M^rid., "Polypiers" p. 20, pi. ix. figs. .17-21, 

 Pala3ont. FranQ., 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 transversa, 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 0"2 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. Ocecial chamber? 



iZct6ito<.— Station 75, lat. 38° 38'N.5Jong. 28° 28' 30" W., 450 fathoms, volcanic mud. 

 Station 151, ofi" Heard Island, 75 fathoms, volcanic mud. Ofi" 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. MacgiUivray 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. JuUien has proposed the name of Tervia, characterised by the 



