42 MR. A. W. WATERS ON THE MARINE 



10 fathoms, are smaller than B. pustulosa *, Hincks. The stolon 

 (O04 mm.) is smaller, the zocecia (0 - 3o-0"45 mm.) are shorter, and the gizzard 

 is about O07 mm. in diameter. The zoarium is usually creeping, but small 

 pieces are free, some of which may have been attached. From the creeping- 

 stolon the zocecia grow on the opposite sides, though not as a rule in pairs, 

 but alternate in groups of four to ten (usually about ten) : after a group 

 there is a diaphragm, followed by a bare stolon for a moderate distance, and 

 then the next group. A few branches grow at right angles to the main 

 stolons, and then there is a diaphragm near the beginning of the new 

 branch. 



Var. ALTERNATA. 



This is much like B. gracillima t, Hincks, but the stolon is smaller in the 

 var. alternate), also the zocecia are smaller than those of typical pushdosa, 

 whereas Hincks describes his gracillima with larger zocecia than those of 

 pustidosa, though from his figure there does not seem to be much difference. 



Wherever this may ultimately be placed, it seems safest to now call it 

 var. alternata. 



Loc. Boa Vista and St. Vincent Harbour, 10 fath., Cape Verde Islands, 

 collected by Crossland. 



Barentsia DISCRETA (Busk), Kirhp. 



Ascopodaria discreta, Busk, Zool. Ohall. Exp. vol. xvii. p. 44, pi. 10. fig's. 6-12 (1886). 



Pedicellina australis, Jullien (non Ridley), Mission Scientilique du Cap Horn, p. 13 

 (1888). 



Barentsia discreta, Harmer, Polyzoa of the ' Siboga ' Exp. p. 29, pi. 2. figs. 8, 9 (1915). 

 As Harmer gives full references I have struck out mine and refer to his paper for synonyms. 



1 have previously mentioned that the connection of the pedicel with the 

 polypide is subject to considerable variation, sometimes the rings mentioned 

 by Busk are seen, but in other specimens there are none. This has been 

 confirmed by Osburn. Asajiro Oka \ has described Barentsia misakiensis as 



* Harmer, in his " Polyzoa of ' Siboga,' " p. 72, has, from my figure, doubted whether I 

 had obtained Boiverbankia imbricata from the Sudan (Journ. Linn. Soc, Zool. vol. xxxi. 

 (1909) pi. 25. fig. 8). But I made sketches of the three conditions of the zooecial chamber, 

 and it was intended to be obvious that fig. 8 represented a zocecium in which histolysis had 

 quite altered the polypide, but, nevertheless, in spite of these great changes having taken 

 place, the shape of the zocecial chamber was not as yet at all altered. L: the object had 

 been to show a perfect zocecium a much more detailed figure would have been drawn, and 

 certainly a little further explanation on mj' part would have avoided false conclusions. 

 The figure merely represents any typical B. imbricata. 



t Hincks, Brit. Mar. Poly. p. 525, pi. 75. fig. 6 (1880). 



% " Sur la Barentsia misakiensis," Zoolog. Magazine, Tokyo, 1895, pp. 76-86, pi. 12. 

 figs. 1-8. 



