REPORT ON THE POLYZOA. 
07 
oi 
The distinction between this form and T esicularia spinosa is too obvious to require 
remark. But there is a second species, which occurred in the “ Rattlesnake ” collection, and 
was procured between Cumberland Island and Point Slade, which appears to be very 
closely allied, and I have, therefore, thought it might be useful to give a description 
of it, though not strictly belonging to the Challenger Expedition. 
(2) Vesicularia trichotoma (PI. VIII. fig. 4). 
Character. — Zoarium of irregular straggling growth, main stems or primary branches 
about 0'2 in diameter, and usually barren, thick-walled. Primary branching, trichotomous, 
secondary usually furcate. Secondary and tertiary branches much slenderer, thin-walled. 
The internodes support eight to ten zocecia, disposed alternately in a double series on 
only one side of the branch ; in the youngest segments there is only a single row. 
Zocecia very readily detached, ovoid, and about 0'4 x 0'2 mm. The surface is smooth and 
the neck short. 
Habitat. — Bass Strait, between Cumberland Island and Point Slade, Voyage of 
H.M.S. “Rattlesnake.” 1 
A peculiarity at once distinctive of this form is the trichotomous division of the 
primary branches ; the great difference in diameter of the branches is also characteristic, 
as distinguishing it from the preceding, with which it agrees in the alternate arrange- 
ment of the zooecia on the internodes. 
2. Farrella, Ehrenburg. 
Farrella, Ehxenb., Johnst., Busk, Engl. Cyclop.; Hincks, Brit. Mar. Polyz., p. 528, &c. 
Lagenella , Farre, W. Thomson, Hassall. 
Laguncula , Yan Beneden. 
Character. — Zoarium stolonate, free, or creeping and adherent ; branching irregularly 
or at definite intervals. Zooecia cylindrical or subventricose below, pedunculate. Orifice, 
when the neck (goulot) is retracted, bilabiate or quadrangular. Neck long, tapering, 
with or without a crown of setae. 2 (No gizzard). 
(1) Farrella atlantica, n. sp. (PI. VII. fig. 3). 
Character. — -Zoarium stolonate, filamentous, jointed at regular intervals, free or 
creeping and adnate. Stolon 0‘02 to (P04 mm. in diameter, throwing out three or four 
short branches or zooecia close below each joint at regular intervals. Zooecia with the 
1 This species does not occur in the Challenger collection. 
2 It does not seem to have hitherto been remarked that the genus Laguncula (V. B.), as exemplified in Laguncula 
repsus and Laguncula elongata, has no setae. 
