14 
THE VOYAGE OF H.M.S. CHALLENGER. 
2. Catenaria, Savigny. 
Ccitenaria (pars), Savigny, 1811 (on Plates); (pars), d’Orb., PaLeont. Franc., p. 42, 1850-1852. 
Eucratea (pars), Audouin ( nec Lamx., Blainv.). 
Alysidium (pars), Bk., Brit. Mus. Cat., 1852. 
Character . — Zoarium erect or free, dichotomously branched ; the zooecium at each 
bifurcation single. Zooecia elongate, snbtnbular or trumpet-shaped, without a frontal 
aperture. Mouth orbicular or semi-orbicular. Avicularia present or absent. 
The typical species I have assumed for this genus is the Eucratea lafontii of 
Audouin (Savigny, Egypte, pi. xiii. fig. 2). 
(1) Catenaria attenuata, n. sp. (PI. II. fig. 1). 
Character. — Zoarium extremely delicate, laxly spreading. Zooecia very long, slender, 
tubular below, trumpet-shaped above. Orifice large arcuate ; lower lip entire, straight. 
Avicularia, 0. Ooecia (?}. 
Habitat. — Station 151, off Heard Island, 75 fathoms, volcanic mud. 
(2) Catenaria bicornis, n. sp. (PL II. fig. 2). 
Character. — Zoarium plumose, very delicate. Zooecia tubular below, ventricose and 
ovate or subglobular above. Surface highly polished. Front occupied almost entirely 
by an oval bordered area (not membranous), in which is a median p^re immediately 
below the mouth, and several others arranged in a crescentic series on each side; all 
the pores surrounded by a thickened border. Orifice semicircular ; lower lip straight, 
entire. A retrocedent sessile avicularium behind each upper angle. Ooecium galeriform, 
ofty, terminal. 
Habitat. — Station 280, lat. 18° 40' S., long. 149° 52' W., 1940 fathoms, Globigerina 
ooze. 
(3) Catenaria diaphana, Busk (PL II. fig. 3). 
Scrupai'ia diaphana, Bk., Quart. Journ. Micr. Sci., vol. viii. p. 281, pi. xxxi. figs. 1, la. 
Character. — Zoarium irregularly ramose. Zooecia pyriform, elongated ; anterior wall 
sparsely punctured, with a slender continuous vitta (?) on each side. Orifice orbicular, 
slightly sinuated below. Peristome thin, subtubular, entire. 
Habitat. — St. Paul’s Bocks, North Atlantic, shallow water. 
[Madeira, J. Y. J.] 
In the description of Scruparia diaphana ( loc . cit.), the peristome is stated to be 
notched above, but this defective condition appears to be only occasional. 
