HYDROZOA — RITCHIE. 823 



the •* very minute pedunculated cups " which Browne found on 

 his specimen from the Bay of Biscay, and which would make 

 necessary the transference of the latter to the genus Zygophylax. 

 Localities. — Station 34, three and a half to two and a half 

 miles off Port Jackson ; depth, 39 to 36 fathoms, sand and mud ; 

 many colonies. Station 40, three miles off Wata Mooli ; depth, 

 52 fathoms, sand and boulders ; few fragments. 



LICTORELLA CONCINNA,ii sp. nov, 



(Plate Ixxxviii., figs. 3, 4.) 

 Station 44, 



This species has been created for a very small number of 

 colonies which were found at Station 44. 



Trophoso'nie. — The largest colony, which is not quite complete, 

 is 25 mm. high. It consists of an axial tube surrounded by a few 

 fascicular tubes which accompany the stem, but occur only on 

 the largest of the branches. On the axial tube are borne hydro- 

 thecse and branches. The latter are pinnately arranged, are sub- 

 alternate, lie in one plane, and appear to be in pairs, each pair 

 being separated by twice the distance which intervenes between 

 the members of a pair. Approximately, two hydrothecse spring 

 from the stem between two pairs of branches, while between the 

 branches of a pair only one is present. The stem shows no traces 

 of division into internodes, but it bears alternate hydrothecse at 

 regular intervals even to the base. The branches are generally 

 simple and monosiphonic, but rarely there occurs a larger indi- 

 vidual, slightly fascicled, and bearing pinnate branches like the 

 stem. All the branches are delicate and elegant, are slightly 

 sinuous, as is the axial tube of the stem, and bear at each bend 

 a hydrotheca. There are no regular nodes, though a rare one 

 occasionally appears half way between two hydrothecee. 



The hydrothecse are very graceful structures. They lie in one 

 plane, and arise alternately from opposite sides of the stem and 

 branches. One is always present at the base of a branch, close 

 to, but not quite in the angle formed between branch and stem. 

 Each hydrotheca rests on a well-marked projection from stem or 

 branch. On this is perched a long cylindrical stalk, slightly 

 constricted at the base, and widening at its upper extremity into 

 the hydrotheca. The stalk is half or a little more than half the 

 length of the hydrotheca. The hydrothecse are deep, tubular, and 

 cyatliiform, the abcauline profile forming a simple convex curve, 

 the adcauline a compound curve, first convex, then concave. 



11 Concinnus, neat, elegant. 



