Interzooecial Communication in Flustridse. By A. W. Waters. 289 
Although we now see, that four of the characters mentioned by 
Hincks cannot be always relied upon, the rosette plates furnish one of 
greater importance, for, as already mentioned, there are four distal 
plates and eight lateral ones, whereas in F. securifrons there are six 
to eight lateral, and only one distal plate. 
I have two small pieces of securifrons from Naples, mounted some 
years ago, but the common species is tenella. 
Loc. Adriatic, Naples, Rapallo. 
« Flustra oblonga sp. n. r plate VIII. figs. 12, 13. 
Carbasea indivisa Joliet, L’Hist. Nat. des Bryozaires des Cotes 
de France ; Arch, de Zool. Exp. et Gen., vi. pp. 92 and 97. 
Dr. Joliet sent me from Roscoff a specimen of what he called 
C. indivisa Busk, but he had overlooked the fact that there are large 
triangular avicularia, whereas none are yet known in the F. indivisa 
from the southern hemisphere. The avicularia occur usually close to 
the intercalation of a new zooecium, and this seems to be the case in 
most Flustra provided with avicularia. 
The surface behind does not seem to be granulated, whereas this 
is given as a character in F. indivisa ; but a large tubular rooting 
process is thrown out from the dorsal surface of most zooecia. In this 
respect it agrees with the Carbasea rhizopora Ortmann,* from Japan. 
The Japanese form, however, has two spines, and the beak of the 
mandible is elongate, so that although closely allied they can hardly 
be united. Flustra membranaceo-truncata also throws out large 
radicals from the back of the zooecium near the distal end, and in 
several respects F. oblonga seems closely allied to it. As seen in a 
specimen mounted whole, there seem to be usually six lateral and four 
distal rosette plates. In some zooecia the watch-glass projections are 
very distinct, while in others they cannot be seen. 
Flustra reticulum Hincks, plate VII. figs. 27, 28 ; plate VIII. 
figs. 10, 11, and 21. 
Flustra reticulum Hincks, Ann. and Mag. Nat. Hist., ser. 5, 
x. p. 94, plate vii. fig. 4 ; Kirkpatrick, op. cit., ser. 6, ii. p. 13. 
• Carbasea reticulum MacGillivray, Trans. Roy. Soc. Viet., xxi. p. 109, 
plate iv. fig. 2. 
In a specimen from Port Phillip, sent to me by Mr. Kirkpatrick, 
there are very wide radical tubes starting from a chamber at the 
bifurcation. They exactly resemble those of Flustra cribriformis , 
as figured in my ‘ Challenger ’ Supp. Rep. on the Polyzoa (plate i. 
fig. 10. Besides these, the marginal zooecia are prolonged into 
spinous processes, which in the spirit specimen are curved over the 
back, as described by Kirkpatrick, who speaks of them as “ marginal 
* ‘ Die Japanische Bryozoenfauna,’ Arch. f. Naturgesch., 1890, i. p. 27, pi. i. 
fig. 24. Hincks has compared Ortmann’s species with F. spinuligera. 
