REPORT ON THE POLYZOA. 
133 
As remarked by Mr. Hincks, with respect to kis Cribrilina speciosa, with which I 
am strongly inclined to think the present form may be identical, it is closely allied to 
if not merely a variety of Cribrilina Jigularis, from which nevertheless it presents 
such considerable differences as to entitle it in my opinion to be regarded as distinct. 
1. In it the costas or fissures between them are more numerous and are not confined 
to a limited area of the front but occupy it entirely. 2. The Costae do not end peripherally 
in a prominent papilla or tubule as in Cribrilina Jigularis and Cribrilina tubulifera, 
Hincks. 3. The mouth is more arched above, and the lower lip is either perfectly straight 
in the older zooecia or very slightly notched in the middle, corresponding to the termination 
of the median symphysial fissure, which remains visible in the younger ones. 4. In the 
transformation of a zooecium into an avicularium, which, though perhaps not exactly homo- 
logous with the large avicularia occasionally seen dispersed between the zooecia in Cribri- 
lina Jigularis as noticed by Mr. Hincks and by Dr. Heller, answers the same purpose. 
§ ( 3 . Front, with punctures in more or less distinct transverse rows. 
(4) Cribrilina labiosa, Busk, var. a,fragilis (PI. XIX. fig. 4). 
Character. — Zoarium flexuose, delicate, white. Zooecia barrel-shaped, front cribrate, 
with the openings in irregular transverse rows. Orifice horizontal, wide transversely ; peris- 
tome much thickened on the sides and in front where it is produced into a wide projecting 
spout, and altogether deficient behind ; an avicularium on each side deeply immersed within 
the orifice, with a curved, triangular, pointed mandible; no perceptible chitinous operculum. 
Habitat. — Simon’s Bay, Cape of Good Hope. 
Though widely different in appearance the essential characters in the present form are 
exactly the same as those of the typical Lepralia labiosa (Brit. Mus. Cat. vol. i. p. 82, 
pi. xcv. figs. 4, 5). But in the description there given, the intra-oral avicularia and 
cribrate condition of the wall, which in that form is covered with a deep brown, thick 
epitheca are omitted, as is also the apparent absence of a chitinous operculum. 
The species might well be regarded as the type of a distinct genus. 
(5) Cribrilina monoceros, Busk, sp. (PI. XIX. fig. 8). 
Lepralia monocer os, Brit. Mus. Cat., vol. i. p. 72, pi. xciii. figs. 5, 6; Macgilliv., Nat. Hist. Viet., 
Dec. iv. p. 32, pi. xxxviii. figs. 1-2. 
(1) Lepralia larvalis, Ibid. p. 30, pi. xxxvii. fig. 5. 
Character. — Zooecia deeply immersed, broad ovate, narrowing below. Primary 
mouth suborbicular and sinuated below ; afterwards coarctate or horse-shoe shaped, and 
more deeply sinuated, with a sharp, internal (articular ?) denticle on one or both sides ; 
peristome thick ; a short, thick, cylindrical process, usually only on one, but sometimes on 
both sides immediately outside the peristome, for the articulation of a long club-shaped 
