of South Devon and South Cornwall. 27 
2. Bueuna, Oken. 
1. B. flabellata, J. V. Thompson. 
Common: frequently on Eschara foliacea; on Gorgonia from 
30 or 40 fathoms ; in shells from Saleombe Bay, &c. 
2. B. avicularia, Pallas. 
Not common: Plymouth. 
3. B. turbinata, Alder. 
Very abundant on rocks near low-water mark. 
[Llandudno, N. Wales ; Isle of Man.] 
4. B. plumosa, Pallas. 
Not common: on scallop and other shells, &c., in Salcombe 
Bay ; “ Polperro, rare” (Couch). 
Fam. Flustride. 
Fiustra, Linneus. 
1. F. foliacea, Linn. 
Comparatively rare in Devon. 
On the Cornish coast, between Rame Head and the Deadman, 
it Is common, according to Mr. Couch. 
2. F. papyracea, Ellis. 
Not uncommon: dredged in Salcombe Bay, &c. 
Fam. Membraniporide. 
Mempranipora, De Blainville. 
1. M. membranacea, Linn. 
Very abundant, overspreading with its beautiful lacework the 
fronds of Laminaria and other sea-weeds. 
2. M. pilosa, Pallas. 
Universally distributed between tide-marks, encrusting various 
kinds of sea-weed, &c.; also on shells, &c., from deep water. 
A pretty, stellate variety, of very delicate texture, occurs in 
deserted shells of Pectunculus glycimeris from Plymouth. 
3. M. Rosselit, Audouin. 
On shells from Torbay, sometimes forming very large patches. 
[Off Maughold Head, Isle of Man. ] 
4, M. Flemingii, Busk. 
Very common, on shells, stones, &c.: from 60 fathoms, off 
