848 MR. A. W. WATERS ON 
the ‘Challenger,’ which no doubt is really A. semzconvoluta, but 
the character has not been found in any other species examined. 
Loc. Mediterranean ; Naples (A. W. IW. coll.) ; Adriatic (Heller). 
Wasin, Brit. E. Africa, 10 fath. (501), collected by Crossland. 
AMATHIA DISTANS Busk. 
Amathia distans Busk, Chall. Exp., Zool. vol. xvii. pt. 50. p. 33, 
pl. vii. fig. 1 (1886): MacGillivray, “On some 8. Australian 
Polyzoa,” Trans. Roy. Soc. 8. Australia, vol. xii. p. 30 (1889); 
“On the Austral. Sp. of Amathia,” Proc. Roy. Soc. Victoria, vol. 
vii. p. 134, pl. C. fig. 3 (1894); Waters, ‘ Mar. Biol. of the Sudanese 
Red Sea, Bryozoa,” Journ, Linn. Soc., Zool. vol. xxxi. p. 243, 
pl. xxiv. fig. 7 (1910). 
The A. distans B., A. tortwosa B., A. semiconvoluta Lamx., and 
A, vidovici Hell. form an incomplete spiral round the stem, only 
occupying part of the internode. The stem of A. distans is thin, 
measuring 0:07 mm. diameter in most of the present specimens. 
The ‘ Challenger’ specimens which I measured have the diameter 
about O'l mm. I seem to have measured some abnormal piece 
from Zanzibar which was stouter. From bifurcation to bifurcation 
is about 2 mm. long. There are 8 tentacles. 
Loc. Off Bahia, 10-20 fath. (B.); South Australia (MacG.) ; 
New South Wales (4. W.W. coll.). Zanzibar town, shore, marked 
“pink Polyzoum” (527), collected by Crossland. 
AMATHIA yipovici (Heller). (Pl. IV. figs. 1, 2.) 
Valkeria vidovici Heller, “ Die Bry. des Adriat. Meeres,” Verh. 
der K.K. zool.-bot. Ges. Wien, vol. xvii. p. 128, pl. v. figs. 3, 4 
(1867). 
Vesicularia dichotoma Verrill, ‘Invert. animals of Vineyard 
Sound,” Rep. Comm. of Fish and Fisheries for 1871-2, p. 874. 
Amathia lendigera Busk, Chall. Exp., Zool. vol. xvii. p. 33 (1886). 
Amathia dichotoma Osburn (Verrill), “ Bry. of the Woods Hole 
Region,” Bull. Bur. of Fish. vol. xxx. p. 254, pl. xxix. figs. 81, 81 a 
(1912). 
The zocecia at a bifurcation are in short biserial clusters, spirally 
arranged, encircling the stolon. There is sometimes a small 
cluster between a bifurcation as shown by Heller, whose figure 
was evidently froma dried specimen and is not entirely satis- 
factory. 
The branches are about 0-2 mm. in diameter. There are 8 
tentacles, which is the same as in A. lendigera L., A. senricon- 
voluta Lamx., A. brongniartii Kirkp., and A. distans B. ‘he 
gizzard is about 0-05—0-06 mm. diameter. 
The connecting cells on the two sides of the rosette-plates are 
fairly similar to those of Zoobotryon pellucidum Hhbr., radiating on 
both sides from the pore, and the cells near this pore stain more 
darkly than the others (fig. 2). 
Loc. Adriatic (Heller); Genoa (Waters coll.) ; Roscoff, sent to 
