10 
THE VOYAGE OE H.M.S. CHALLENGER. 
2. Catenaria, Savigny. 
(1) Catenaria attenuata, n. sp. (PI. II. fig. 1). 
(2) Catenaria bicornis, n. sp. (PL II. fig. 2). 
(3) Catenaria diaphana, Busk (PI. II. fig. 3). 
1. Catenicella , Blainville. 
Catenicella (pars), Blainv., d’Orb., Brit. Mus. Cat., &c. 
Catenaria (pars), Savigny. 
Eucratea (sp.), Audouin. 
Cellaria (pars), Lamk. 
Character. — Internodes usually unicellular ; the zooecia arising one from the upper 
and back part of another, by a corneous tube, all facing the same way and forming 
dichotomously divided branches of an erect phytoid zooecium. The zooecium at each 
bifurcation geminate ; each zooecium with two lateral, usually trilocular, processes [alee). 
Ooecia either subglobose and terminal or immersed, and placed below the orifice of a 
zooecium in front. 
§ a. fene stratce. 
Front fenestrate. Ooecia terminal. 
f ... . fc 
(1) Catenicella ventricosa, Busk, var. maculata. 
Catenicella ventricosa, var. maculata, Bk., Brit. Mus. Cat., vol. i. p. 7, pi. iii. figs. 4, 5. 
Cellaria catenulata, Lamk. 
Character. — Zooecia ovate, compressed. Alse wide, having sometimes a cup-like 
cavity above, which is occasionally closed, and formed into a broad conical spine. Fenestrse 
seven, with fissures radiating towards a rounded central pore. Surface of front studded 
with minute acuminate papillae ; back smooth, sometimes with dark spots. 
Habitat. — Station 163a, off Twofold Bay, lat. 36° 57' S., long. 150° 34' E., 150 fathoms, 
green mud. 
[Bass Strait, 45 fathoms, Voy. of Rattles.; Victoria, Macgillivray.] 
(2) Catenicella hastata, Busk. 
Catenicella hastata, Bk., Brit. Mus. Cat., vol. i. p. 7, pi. ii. figs. 3, 4; Voy. of Rattles., vol. i. 
p. 355; Macgilliv., Nat. Hist. Viet. Dec. iii., p. 19, pi. xxiv. fig. 4. 
Catenicella bicuspis, Gray, Dieffenb., N. Z., vol. ii. p. 293. 
Character. — Zooecia ovate. Fenestrse numerous, disposed round a scutiform area, 
with fissures radiating towards the middle line. Lateral processes very wide, upper 
