88 Canon A. M. Norman—WNotes on the 
phiblestrum behind, but here also extending up the sides and 
round the front, so that the membranous portion is completely 
surrounded by it, and the calcareous portion sloping inwards 
and downwards; the membranous portion with the oral 
opening is situated in a deep hollow. On the distal margin, 
in the place usually occupied by the oral spines, a pair of 
avicularia, with their pomted mandibles directed inwards 
in such a way so that their tips nearly meet in the middle. 
There are three pair of lateral pore-chambers and several 
(four usually) lucid spots in the hind wall. 
Antropora is remarkable on account of the most unusual 
position of the avicularia transversely situated above the oral 
opening. Avicularia occur on the sides of the oral opening 
and sometimes appear above it (as in Amphiblestrum Flem- 
ingii), but in this latter case they belong to the bottom of the 
zocecium above; here they are in the extreme upper part of the 
zceecium. The back of the zocecium is characterized by three 
pair of conspicuous pore-chambers, and on the anterior part 
of the back wall, which is more thickened than the portion 
posterior to it, are at the front two transparent bays, and 
behind these a pair cf round lucid spots, behind which again 
are sometimes seen two others of much smaller size (fig. 4). 
The types were described by Hincks from specimens sent 
to him from Madeira by Mr. J. Y. Johnson. In 1896 I 
dredged it not rarely off that island in 70-100 fathoms, 
encrusting small shells such as young Pectens, Venus medi- 
terranea, Dentalium, &c., and it especially affected fragments 
of the coral Madracis asperula. The polyzoon most commonly 
associated withit was Onychocella antiqua, Busk. Thesespecies 
often grew over each other, and were so curiously alike in 
general form and appearance that the avicularia of Antropora 
were the available character for separating them with a hand- 
lens. 
Genus AmmatorHorA™, gen. noy. (PI. VIII. figs. 5, 6, 7.) 
Type, Ammatophcra (Membranipora) nodulosa (Hincks). 
Membranipora nodulosa, Hincks, Hist. Brit. Marine Polyzoa, p. 170, 
pl. xx. fig. 9. 
Zocecia and ocecia depressed and flattened. Zocecia sub- 
ovate ; a calcareous crest occupying about two-thirds of the 
area, Oral opening at distal end of the membranous portion. 
Walls thin, terminating at the oecium ina knob. Ocecium 
entirely separable from the zocecium, resting on the knobs 
just mentioned ; of unusual and varied form (see figures). 
* dupa, a knot, and depo. 
