;6 



solitary and is elongated in the same direction as the zooecium, reaching about half its length 

 and about three quarters of its width. An advanced embryo, to which this description refers, 

 measures 205 by 70 a. 



The zooecia vvith functional polypides are 600 — 650 p. in length and 70 — 85 p. in greatest 

 breadth (fig. 7); but the elongated zooecium shown in fig. 10 is 1140 ij. long. In other cases 

 the length may not exceed 450 ij.. The contracted zooecia shown in fig. 5 are 220 — 250 ft in 

 length and 70 — 90 u. in breadth. It may be noticed that the stalk-like proximal portion of 

 these individuals remains uncontracted. The stolon is about 1 9 u wide. 



This very beautiful species ma)- probably be regarded as the commonest Ctenostome in 

 the area investigated, since I have found it from fourteen of the Stations, ranging from Java 

 in the West to the Aru Islands in the East and Lirung in the North; the triangle defined 

 by these three points including nearly all the Stations at which Polyzoa were found. It is so 

 inconspicuous that it is not readily seen except by microscopic examination ; and it has thus 

 always been found accidentally, on some other species which has been large enough to have 

 been recognised as belonging to the collection of Polyzoa. It is probable that an examination 

 of the specimens of Hydroids and other objects obtained by the Expedition would result in its 

 discovery from many Stations where I have not found it. 



2. Valkeria tuöerosa Heller. (PI. VI, figs 13 — 20). 



Valkeria tuöerosa Heller, 1867, "Bry. Adriat.", Verh. zool. -bot. Ges. Wien, XVII, p. 129, 



PI. VI, figs 3, 3 «. 

 Valkeria tuberosa Carus, 1889, "Prodr. Faun. Med.", II, p. 52. 

 Valkeria tuberosa Vine, 1891, "Brit. Pal. Cten. Pol.", Proc. Yorksh. ■Geol. Polyt. Soc, XII, 



p. 91, PI. IV, fig. 2 (recent, Naples; figured for comparison with fossil species). 

 Valkeria uva (pars), Waters, 1910, "Rep. Mar. Biol. Sud. Red Sea", "Bry. II", J. Linn. Soc. 



Zool., XXXI, p. 250, PI. XXIV, fig. 13 (Naples). 



332. B. Stat. 64. Kambaragi Bay, Tanah Djampeah, o — 32 Metres ; coral, coral-sand. (On 



332. A., Micropora ratoniensis Waters). 

 57. R. Stat. 80. Borneo Bank, 40 — 50 Metres; fine coral-sand. 

 488.I. Stat. 133. Anchorage off Lirung, Salibabu Island, o — 36 Metres; mud and hard sand. 



'I Stat. 164. i°42'.5 S., I30°47'.5 E., 32 Metres; sand, small stones and shells. (On other 

 " t Polyzoa, Hydroids, Alcyonaria, shell, etc). 



360. C. Stat. 240. Banda Anchorage, 9 — 45 Metres; black sand ; coral, Lithothamnion-bank. 

 255. D. Stat. 311. Sapeh Bay, E. coast of Sumbawa, o — 36 Metres; mud and sand. 



Zoarium repent, its narrow stolon attached to Polyzoa, Hydroids, Alcyonaria, shells and 

 other objects. The stolon dilates at intervals into a slight swelling, cut off distally by a diaphragm 

 and producing, on each side, a branch composed of short internodes, each of which gives off 

 paired lateral branches like those of the main stem. Zooecia and new stolons are produced 

 by the branches thus formed. Owing to this mode of branching and to the shortness of the 

 internodes, the zooecia are crowded into a group which is circular in outline when seen from 

 above. Zooecia subcylindrical, narrower at the base, of nearly uniform width, and relatively 

 broad and short. Orifice terminal, more or less quadrangular. Everted kamptoderm considerably 



76 



