36 
THE VOYAGE OF H.M.S. CHALLENGER. 
(7) Amathia semispiralis, Kirchenpauer (sp.) (PL VIII. fig. 3). 
Serialaria semispiralis, Kirchenpauer, Cat. Mus. Godeffroy, vol. iv. p. xxxiv., 1869. 
Character. — Zoarium filamentous, dichotomous; stem brownish, about 0’3 mm. in 
diameter. Zooecia disposed in short series, composed of four to eight pairs of cells ; 
series distant, placed obliquely, three or four in each internode ; zooecia slender, 
cylindrical or somewhat quadrangular in form, about 0‘6 to Off x 0'15 mm., obtuse and 
strongly wrinkled transversely at the closed end ; neck very short, and setae short. 
Habitat. — Station 188, lat. 9° 59' S., long. 139° 42' E., 28 fathoms, green mud. 
[Samoa, Kirchenpauer.] 
It may be doubtful whether this form is really that intended by Kirchenpauer, who 
( loc . cit.) describes the zoarium, as “ dichotomously branched. The cells dispersed in 
biserial groups, at certain distances apart, and spirally round the stem ; each spiral, 
however, extending only about one-half round the axis. From Serialaria semiconvoluta, 
Lamk., it differs in the character that in that species the tubular cells form much longer 
rows, whilst it also has an entirely different habit.” How M. Kirchenpauer can bring it 
at all in comparison with the Serialaria continhii, which in habit more resembles 
a Mimosella, is more than I can imagine. No two things would appear to be more 
distinct. 
2. Vesicularia, Thompson. 
Vesicularia, J. V. Thompson (pars); Earre, Johnst. Busk, Engl. Cyclop. ; Hincks, Brit. Mar. 
Polyz., p. 512, &c. 
Sertularia (pars), Linn6, Pallas, &c. 
Laomedea (pars), Lamx., Blainville. 
Valkeria (pars), Fleming. 
Character. — Zoarium erect, radicate, or rooted by a fibrous base. Zooecia distinct, 
usually distant, disposed in a single row or alternately in two rows on one face only of 
the stems. (Polypides with a gizzard, Hincks). 
(i) Vesicularia papuensis, n. sp. (PI. VIII. fig. 1). 
Character. — Zoarium about f- inch high, very delicate, branching dichotomously in 
one plane, at an acute angle, rooted by short radical fibres. Branches composed of three 
or four internodes, about Off 5 mm. in diameter, and each supporting on one face a double 
row of zooecia disposed alternately on each side. Zooecia ovate, Off x Off 5 mm. (with the 
neck retracted); neck thick and rather bulbous ; surface generally smooth. No gizzard. 
Habitat. — Station 188, lat. 9° 59' S., long. 139° 42' E., 28 fathoms, green mud. 
