854 MR. A. W. WATERS ON 
Vicinity,” Bull. Bureau of Fisheries, vol. xxxi. pt. 2, p. 606 
(1911). 
The specimens from Chuaka have groups of zocecia at distant 
intervals, and there are fully formed embryos in the zocecia. 
Loc. See above and add: Vineyard Sound, 6-8 fath. ete. 
Chuaka, Zanzibar, 2 fath., on seaweed with Starpanie dendro- 
grapta Waters (508); aud Chuaka shore, on Amathia lendigera 
(521): collected by Crossland. 
CYLINDR@CIUM GIGANTEUM (Busk). 
 Farrella gigantea Busk, Quart. Journ. Micr. Se. vol. iv. p. 93, 
pl. v. figs. 1, 2 (1856). 
Cylindreecium giganteum Hincks, Brit. Mar. Poly. p. 535, 
pl. Ixxvii. figs. 3, 4 (1880). 
The largest zoccia from Chuaka are about 0°25 mm, long. 
There is no dilation at the base, and the contents of the wall are 
mostly calcareous, giving it a white appearance, so that at first 
I was inclined to Teal it var. album. When placed in acid it 
becomes transparent. The determination of Cylindrecium is 
always very unsatisfactory, and probably C. gigantewm and 
C. dilatatum have not always been correctly distinguished. 
The stolons branch in various directions. 
Loc. British; Mediterranean; Red Sea; off Portugal; Ceylon ; 
Cargados ; Farquhar Reef (7’.); Queen Charlotte Island ; Tor- 
tugas. Chuaka, Zanzibar, 2 fath. (508); Prison Island, Zanzibar, 
collected by Crossland. 
Busk1A NITENS Alder. 
Buskia nitens Alder, Q. J. Micr. Sc. vol. v. p. 24, pl. xiii. figs. 1,2 
(1857); Hincks, Brit. Wars Poly. p. 532, pl. iin figs. 6, 7, Onn 
cut, fig. 28 (1880) ; Ann. Mag. Nat. Hist. ser. 5, ak xili. p. Os 
Levinsen, ‘“ Zool. Danica, Mosdyr,” p. 83, pl. viii. figs. 12, 13 
(1894). 
From Ras Osowamembe, growing on the stalk of I/imosella 
bigeminata, nov. Levinsen says that there are 8 tentacles. 
Loc. Arctic; Davis Strait, 100 fath. ; British; Danish ; Queen 
Charlotte Island (#.). Ras Osowamembe, Zanzibar Channel, 
10 fath. (504), collected by Crossland. 
PEDICELLINA SPINOSA (Robertson). (Pi. IV. figs. 10, 11.) 
Myosoma spinosa Robertson, “Studies in Pacific Coast Euto- 
procta,” Proc. Calif. Acad. of Sciences, ser, 3, vol. il. p. 324, 
pl. xvi. figs. 1-12 (1900). 
There are two specimens from Wasin, which well show most of 
the characters mentioned by Dr. Alice Robertson. ‘The spines 
en both the stalk and calyx are stout and long, whereas those on 
P.cernua may be called almost hairs, and the spines are abundant 
on the one side and absent on the other, the obliquity of the ten- 
tacular region also occurs. The number of tentacles is about 14. 
