20 
THE VOYAGE OF H.M.S. CHALLENGER. 
In this species the branches are all bordered by very closely adnate calcified radical 
tubes. 
(2) Menipea aculeata, d’Orbigny (sp.) (PI. IV. fig. 2). 
Tricellaria and Ternicellaria aculeata , d’Orb., Voy. en Amer. Mbrid., p. 8, pi. ii. figs. 1-4. 
(?) Menipea fuegensis Bk., Kerg. Polyz., Phil. Trans., p. 194; Brit. Mus. Cat., vol. i. p. 21, 
pi. xix. 
Character. — Zocecia, three in each internode, much elongated and attenuated 
interiorly . Aperture about one-third the length of the cell ; bordered, slightly thickened. 
Three spines above ; a small, bi- tri-furcate fornix. A small avicularium in front, below 
the aperture. 
Habitat. — Station 303, lat. 45° 31' S., long. 78° 9' W., 1325 fathoms, blue mud. 
Station 314, lat. 51° 35' S., long. 65° 39' W., 70 fathoms, sand. Station 315, lat. 51° 40' S., 
long. 57° 50' W., 5 to 12 fathoms, sand and gravel. 
[Kerguelen Island, Eaton ; Patagonia, d’Orbigny.] 
Menipea fuegensis , Brit. Mus. Cat., vol. i. p. 21, pi. xix., is of much stronger growth, 
and has four spines and a simple ligulate fornix; and the cells are less attenuated. 
(3) Menipea clausa, n. sp. (PI. IV. fig. 5). 
Character. — Zoarium opaque ivory white, about 1 inch high, composed of few 
straggling, dichotomous branches, rising from a slender stem, composed of a close bundle 
of partially calcified radical tubes, the fibrous extremities of which are attached to dead 
Globigerina shells. Zooecia much elongated, sub-cylindrical interiorly, the upper third 
forming an oval dilatation ; aperture wide, completely covered by a convex fornix, which 
is connate with the border of the aperture, and fissured all round except at the part where 
the pedicle of the fornix arises on the inner side. The mouth of the cell (the lower border 
of which is formed by the upper edge of the fornix) is' semicircular. Two oral spines on 
the outer and one on the inner side of the mouth. A small avicularium in front below 
the aperture, and a very minute one behind the cell near the summit. Ooecia lofty, 
narrow ; surface polished. 
Habitat. — Station 70, lat. 38° 25' N., long. 35° 50' W., 1675 fathoms, Globigerina ooze. 
This extremely beautiful form is remarkable for the peculiar development of the 
pedunculate fornix, which forms a complete calcareous cover to the aperture; but that 
this cover is in reality nothing more than a magnified fornix, is obvious from the 
circumstance that, like that appendage in many other cases, it is formed of concentric rings 
starting from the site of the peduncle. 
The back of the branches is covered by numerous calcified radical tubes, each 
individual zooecium apparently being supplied with one. 
