Gen. 48. P lacobranchus, Van Hasselt. Tentacles 4, back with 2 lateral
membranous expansions, having their upper surface covered
with folds. Tongue ? . . .
Fam. 16. limapontiadce.
Gen. 49. A cteonta, Quatref. Tentacles 2 flattened lobes at the sides of
the head, produced behind into points; sides of the back with a
tubercular ridge in the region of the anus. Tongue, a single
plate with a large broad spine, A spinous buccal collar
Gen. 50. L imapontia, Johns. Tentacles wanting; sides of the head arched
and carinated; back plain, without appendages. Tongue, a
single plate with a large broad spine. A spinous buccal collar
Tribe 2. Body cylindrical or compressed.
Fam. 15. Phyllirrhoidte.
Gen. 51. P h yllirrhoe, Peron. Tentacles2, long; tail truncated. Tongue,
a single central plate with numerous denticles
P. ocellatus, Rang.
A. senestra, Quatref.
L. nigra, Johns.
P. Bucephala, Peron.
LIST OF WORKS AND PAPERS REFERRED TO IN THIS MONOGRAPH.
Alder, J. ‘Observations on the Genus Polycera of Cuvier, with Descriptions of two New British Species ;’ ‘Annals
and Magazine of Natural History,’ v. 6, p. 337 ; London, January, 1841.
c Note on Euplocamus, Triopa, and Idalia; ‘Annals and Magazine of Natural History,’ v. 15, p. 262;
April, 1845.
‘ Catalogue of the Mollusca of Northumberland and Durham ‘ Transactions of the Tyneside Naturalists’
Field Club,’ v. 1, p. 97 ; Newcastle-upon-Tyne, 1848.
Alder, J ., and Hancock, A. ‘Descriptions of some New Species of Nudibrancous Mollusca from the Coast of
Northumberland ;’ ‘ Ann. and Mag. Nat. Hist.,’ v. 9, p. 31 ; March, 1842.
‘ Notice of a British Species of Calliopcea, D’Orbigny, and of four New Species of Eolis, with Observations
on the Development and Structure of the Nudibranchiate Mollusca ;’ ‘Ann. and Mag. Nat.
Hist.,’ v. 12, p. 233; October, 1843.
‘Description of a New Genus of Nudibranchiate Mollusca, with some New Species of Eolis;' ‘Ann.
and Mag. Nat. Hist.,’ v. 13, pp. 161 and 407; March, 1844. ‘Ann. des Sciences Naturelles,’ 3me
ser., v. 1, p. 190.
* Report on the British Nudibranchiate Mollusca ;’ ‘ Report of the British Association' for the Advancement
of Science,’ 1844, p. 24.
‘Remarks on the Genus Eolidina of M. de Quatrefages;’ ‘Ann. and Mag. Nat. Hist.,’ v. 14,p. 125 ;
August, 1844.
‘Descriptions of Pterochilus; a New Genus of Nudibranchiate Mollusca, and a New Species of Doris;’
‘Ann. and Mag. Nat. Hist.,’ v. 14, p. 329; November, 1844.
‘Notice of a New Genus and several New Species of Nudibranchiate Mollusca;’ ‘Ann. and Mag. Nat.
Hist.,’ v. 16, p. 311 ; November, 1845.
‘ Notices of some New and Rare British Species of Naked Mollusca;’ ‘Ann. and Mag. Nat. Hist.,’ v. 18,
p. 289 ; November, 1846.
‘Additions to the British Species of Nudibranchiate Mollusca;’ ‘Ann. and Mag. Nat. Hist.,’ 2d ser.,
v. 1, p. 189; March, 1848.
‘On a Proposed New Order of Gasteropodous Mollusca;’ ‘Ann. and Mag. Nat. Hist.,’ v. 1, p. 401 ;
June, 1848.
, ‘ Descriptions of two New Species of Nudibranchiate Mollusca, one of them forming the Type of a New
Genus;’ ‘Ann. and Mag. Nat. Hist.,’ 2d ser., v. 8, p. 290; October, 1851.
Allman, G. J. ‘On the Anatomy of Acteeon, with Remarks on the Order Phlebenterata of M. de Quatrefages;’
‘Ann. and Mag. Nat. Hist.,’ v. 16, p. 148; September, 1845.
‘Note on a New Genus of Nudibranchiate Mollusca;’ ‘Ann. and Mag. Nat. Hist.,’ v. 17, p. 1 ; January,
1846.
Baster, J. ‘Opuscula Subseciva;’ Harlemi, 1759—1765.
Bate, C. Spence. ‘Notes on the Fauna of Swansea and the Neighbourhood;’ ‘Report of Swansea Literary and
Scientific Society;’ Swansea, 1850.
Blainville, H. M. Ducrotay de . ‘Manuelde Malacologie et de Conchyliologie;’ Paris, 1825.
Blanchard, E. ‘ Recherches sur l’Organisation des Mollusques Gastéropodes de l’Ordre Opisthobranches ;’
‘Annales des Sciences Naturelles,’ 3me ser., vl 9, p. 172, and v. 11, p. 74 ; Paris, 1835.
Bommé, L. ‘Bericht vegens een zonderling Zee-Insect, gevonden aan einige zee wieren gevischt op het strand van
het eiland Walcheren ;’ ‘ Act. Vless.,’ v. 1, p. 394, v. 3, p. 290, and v. 6, p. 357 ; Flushing.
Bouchard-Chantereaux. ‘ Catalogue des Mollusques Marins, observés jusqu’à ce jour à l’etat vivant sur les
Côtes du Boulonnais ;’ Boulogne-sur-Mer, 1835.
Cantraine, F. ‘Malacologie Méditerranéenne et Littorale;’ Bruxelles, 1840.
Cavolini, F. ‘Memorie per servire alla Storia dei Polipi Marini;’ Napoli, 1785.