BRYOZOA FROM ZANZIBAR. 847 
(504); Prison Island, Zanzibar Channel, 8 fath. (505), collected 
by Crossland. 
AMATHIA LENDIGERA (Linneus). (Pl. IV. figs. 3, 4.) 
For synonyms see Miss Jelly’s Catalogue and add :— 
Amathia lendigera (L.), MacGillivray, “On the Australian 
Species of Amathia,” Proc. Roy. Sec. Vict. vol. vii. p. 185, pl. B. 
fig. 1 (1894): Calvet, “‘ Bry. Ectoproctes,” pl. vill. figs. 19, 20, 
pl. xiii. figs. 138, 21 (1900); “ Bry. Mar. des Cotes de Corse,” p. 46 
(1902); “ Bry. Mar. de la Région de Cette,” p. 90 (1902); Jullien 
& Calvet, “ Bry. de |’Hirondelle,” p. 31 (1903) ; Guerin-Ganivet, 
“Bry. de la Rég. de Concarneau,” Tr. Se. du Lab. de Zool. et de 
Phys. Mar. de Concarneau, vol. iv. p. 23 (1912). 
The stems of the specimens from Chuaka are about 0-07 mm. 
in diameter. This species differs from A. videvei Hell. in not 
having the zoecia spiral, also in the branching being more or 
less at right angles to the main branch (fig. 4), whereas in most 
Amathia the branches divide equally in both directions. Hincks 
has figured the branching of lendigera. 
Some sections of material from Swanage cut across the rosette- 
plate show the semicircle of cells, with nuclei at the end of the 
cell, directed to the pore; also the round mesenchym-cells with 
round nuclei are separated from the wall of the stolon, and are 
seen to pass over the mound of cells; up to this mound come the 
funicular threads with their elongate nuclei (fig. 3). The struc- 
ture of the cells near the rosette is very similar to that described 
in Zoobotryon (see page 850). 
Loc. British, French and Belgian coasts, Mediterranean, Adri- 
atic ; Corsica (40-60 met.) (Calvet); Azores (J. &@ C.); Western 
Port, Victoria (acG.). Chuaka, Zanzibar shore (521, 523), 
collected by Crossland. 
AMATHIA SEMICONVOLUTA (Lamouroux). 
Amathia semiconvoluta Lamx. Encycl. Méth., Zoophytes, p. 44 
(1824); Heller, “‘ Bry. Adriat.,” Verh. der K.I. zool.-bot. 
Ges. Wien, vol. xvii. p. 127, pl. v. figs. 1, 2 (1867); Calvet, Bry. 
Kctoproctes, pl. vii. figs. 8, 9, pl. viil. figs. 16, 18 (1900); “ Bry. 
Mar. de la Région de Cette,” Tr. Inst. de Zool. de |’Univ. de 
Montpellier, ser. 2, mém. 11, p. 89 (1902); Waters, Journ. Linn. 
Soc., Zool. vol. xxxi. pl. xxiv. fig. 6 (1910). 
Serialaria seniconvoluta Lamk. Hist. Nat. d’Anim. sans vert., 
ed. ii. vol. ii. p. 171 (1836); d’Orbigny, Pal. Frang. vol. v. p. 595 
(1850 -52). 
The yellowish thick chitin-stem is about 0°25 mm. diameter. 
Near the proximal end of each internode there is a clear oval 
spot, which is for the attachment of a radicle, yet although this 
mark for the attachment occurs in all internodes, radicles have 
only been seen in a very few cases. A similar mark for radicles 
oceurs in A, obligqua MacG., and also in A. brasiliensis Busk, of 
