REPORT ON THE POLYZOA. 
7 
When the calcareous matter is removed by weak acid, the chitinous basis of the 
zooecia is seen to be very delicate and transparent ; and in this condition the puncta 
visible in the wall of the zocecium in its natural state appear as oval rings, occupied by 
a delicate membrane (fig. 1, e), in the centre of which is a nuclear mass, consisting of five 
or six highly refractive globular particles. The puncta, therefore, as in many other cases, 
are not truly pores, but appear to be of the same nature as the common interzooecial discs 
or so-called “ Rosettenplatten.” 
4. Brettia, Dyster. 
Brettia , Dyster, Quart. Journ. Micr. Soc., vi., 1858, p. 260; Hincks, Brit. Mar. Polyz., p. 27. 
Character. — Zooecium erect, corneous or subcorneous. Zooecia given off from the 
upper and back part of the subjacent one, above and behind the aperture ; all facing the 
same way ; uniserial, elongate, tubular or trumpet-shaped, with a large terminal or sub- 
terminal aperture, and a small semicircular orifice. (Margin of aperture with or without 
spines.) 
(1) Brettia australis, n. sp. (PI. XXXIV. fig. 3). 
Character. — Zocecium very small, regularly dichotomising, each zocecium giving off 
a pair. Zooecia trumpet- shaped, slightly curved. Aperture oblique or subterminal, 
rounded or oval. Margin unarmed. 
j Habitat. — Station 196, lat. 0° 48' S., long. 126° 58' E., 825 fathoms, hard ground. 
(Parasitic on Bicellaria hella.) 
Only a single minute specimen of this very elegant species has been noticed in the 
collection. It is excessively delicate and transparent, but at the same time presents a 
pearly aspect, showing that it is not wholly “ corneous.” 
(2) Brettia cornigera, n. sp. (PI. XXXIV. fig. 6). 
Character. — Zocecium lax, composed of dichotomous branches, springing from a 
common stem formed of radical tubes. Lower internodes very long and tubular, with a 
rudimentary aperture and uninhabited. Upper ones trumpet-shaped, much elongated 
and tubular downwards, with an oval aperture nearly half the length of the cell ; four 
small pointed submarginal spines above, in front, and two behind. Ocecia, 0 (?) 
Avicularia, 0. 
Habitat. — Station 23, off Sombrero Island, 450 fathoms, Pteropod ooze. 
