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THE VOYAGE OF H.M.S. CHALLENGER. 
4. Iclithyaria, n. gen. 
Character. — Zoarium continuous, branched ; branches irregularly dichotomous or 
forked, biserial, zooecia facing in one direction ; the two series very loosely connected. 
Zooecia ventricose rounded, front entirely calcified. 
Ichthyaria oculata, n. sp. (PI. XIII. fig. 7). 
Character. — Zooecia pyriform or pisciform, square at the top, gibbous on the inner 
side. Surface smooth and polished ; on the back an elongated vertical fissure remains 
membranous. Orifice semicircular, with a nearly straight entire lower lip. A conical 
process on the upper and outer angle, perforated at the base — a large round pore on 
the outer side, close below the angle of the mouth, and two on the inner, one above 
the other. 
Habitat. — Station 314, lat. 51° 35' S., long. 65° 39' W., 70 fathoms, sand. Station 
320, lat. 37° 17' S., long. 53° 52 ' W., 600 fathoms, green sand. 
Family VII. Gemellariad^e. 
Gemellariadce (pars), Bk., Voy. of Rattles., vol. i. p. 383, Brit. Mus. Cat., vol. i. p. 33. 
Eucratiidce, Hincks (pars). 
Character. — Zoarium submembranaceous, flexible, continuous. Zooecia opposite, in 
pairs, unarmed. 
With the exception of Notamia, the Family as here proposed would include those 
genera arranged under it in the Brit. Mus. Cat., viz: — 
Gemellaria, Savigny. 
Didymia, Bush. 
Dimetopia, Bush. 
To which might perhaps be added: — 
Scruparia (pars), Hincks (nec Smitt). 
Brettia, Dyster. 
Huxleya , Dyster. 
The Family here contains only the following genera: — 
1. Didymia, Busk. 
Didymia simplex, Busk. 
2. Dimetopia, Busk. 
Dimetopia cornuta , Busk. 
