4 
THE VOYAGE OF H.M.S. CHALLENGER. 
2. Hippothoa, Lamouroux. 
Catenicella (pars), Blainv. 
Tubalipora, sp., Jameson. 
Mollia (pars), Smitt. 
Character. — Zocecia calcareous, decumbent, adherent, usually distant and connected 
by tubular prolongations. Branches given off from the sides of a zooecium. Orifice 
orbicular, sometimes produced and subtubular, with a sinus in the lower border. 
(1) Hippothoa divaricata, Lamouroux. 
Hippotlioa divaricata, Lamx., Brit. Mus. Cat., Johnst., Auctt. 
Mollia hyalina, forma divaricata, Smitt, Ofversigt k. Vetensk.-Akad. Forhandl., 1867. 
Character. — Zooecia ovate or pyriform. Surface usually striated transversely, and 
subcarinate in front. Orifice orbicular, with a median notch below. 
Habitat. — Station 75, lat. 38° 38' N., long. 28° 28' W., 450 fathoms, volcanic 
mud. Station 135, Islands of Tristan da Cunha, 60 to 1000 fathoms, hard ground, shells 
and gravel. 
[Cosmopolitan.] 
(2) Hippothoa flagellum, Manzoni (PI. XXXIII. fig. 7). 
Hippotlioa flagellum, Manz. Brioz. fossil., Ital. 4th Contrib, p. 6, pi. i. fig. 4 ; Suppl. alia 
Fauna d. Brioz. Medit. ; 1st Contrib, p. 3, pi. i. fig. 5.(1); Hincks, Ann. and Mag. Nat. 
Hist. ser. 4, vol. xx. p. 218, 1877 ; Brit. Mar. Polyz., vol. i. p. 293, pi. xliv. figs. 5, 7. 
Character. — Zooecia ovate, smooth, not carinated, slightly elevated towards the upper 
end, not much produced below ; connected by very slender, tubular processes ; much 
longer than the zooecium. Orifice subclithridiate ; peristome slightly thickened. (Ocecia 
small, globose, smooth, borne on a partially developed cell, generally attached to the side 
of a normal zooecium by a very short fibre, Hincks.) 
Habitat. — Station 151, off Heard Island, 75 fathoms, volcanic mud (parasitic on 
Myriozoum marionense). 
[Cosmopolitan; Pliocene.] 
3. Pasythea (pars), Lamouroux. 
Cellaria (pars), Solander. 
Sertidaria (pars), Gnmeli. 
Lirio7.ua, Lamk. 
Tuliparia, Blainv. 
Epicaididium, Hincks. 
Gcmellipora (pars), Smitt. 
Character. — Zooecium, in the erect portion, consisting of a central stem formed either 
of calcareous clavate segments or of successive pairs of zooecia. From the sides of the 
