ALDER, ON NEW BRITISH POLYZOA. 103 
and straight below; upon or a little within the under lip 
is a slightly raised circular avicularium. Ovicel/s smooth, pro- 
minent, hooded, or contimued below into a projecting margin 
surrounding the mouth of the cell. Height, an inch and a 
quarter ; lateral expansion, about an inch and ahalf; breadth 
of branches ~!,th of an inch. 
Cellepora levis, Fleming, ‘ Brit. Anim.,’ p. 532; Johns. 
‘ Brit. Zoop.,’ p. 299. 
Eschara teres, Busk in ‘Ann. Nat. Hist.,’? 2nd series, 
Vol. xvii, p. 33, t.1, fig. 2. 
Eschara levis, Sars, «Besk. over- nogle Polyz.,’ p. 12. 
This species was described by Dr. Fleming i in 1828. from 
a single specimen got in deep water, Shetland. Since that 
time it does not appear to have been recognised by British 
authors, for the specimens got on the Cornish coast, which Mr. 
Richard Couch referred to this species, appear from his com- 
parison of them with C. cervicornis to have been something 
else. Dr. Johnston did not know the species, and the sup- 
posed C. levis, got by Mr. John Macgillioray, on the Aber- 
deenshire coast, was probably, as Dr. Johnston supposed, 
a worn variety of C. ramulosa. Professor Busk does not 
notice it in his ‘Catalogue of Marie Polyzoa,’ and in his 
‘Polyzoa of the Crag’ quotes C. levis as a synonym of 
C.ramulosa. The same naturalist has, however, described a 
species from the coast of Norway, brought home by Mr. 
McAndrew, under the name of E. teres, which proves iden- 
tical with this. Mr. Barlee, in the mean time, had got 
several good specimens in Shetland, but probably consider- 
ing it a variety of EH. ramulosa, he had not placed it in Mr. 
Busk’s hands for description. Prof. Sars finds this fine 
species pretty generally distributed on the coast of Norway, 
in deep water, from 36 to 150 fathoms, and has published an 
excellent description of it in his ‘ Beskrivelse overnogle 
Norske Polyzoer.’ He very correctly recognises it as the 
C. levis of Fleming. ‘The species is perfectly distinct from 
the C.ramulosa; and I have great pleasure in vindicating 
the correctness of Dr. Fleming, and restoring it to its place 
in the British Fauna, from which there appeared some chance 
of its being expunged. 
Eschara levis is one of those species that form an interme. 
diate link between Cellepora and Esehara; its rounded 
branches, with the cells ranged round an imaginary axis, 
agreeing with Cellepora, while the cells themselves bear the 
character ofan Eschara. Occasionally, however, the branches 
assume a flattened shape. The lower parts of the branches 
are generally worn smooth, and the apertures often over- 
