380 * POLYCERIDA. 
AnouLa, Lovén, 1846. 
Syn.—Miranda, Ald. and Hane., 1847. Drepania, Lafont, 
1874. 
Disir.—3 sp. N. Atlantic O. A. cristata, Ald. and Hane. 
(xc5 12): 
Body limaciform, smooth. Mantle obsolete, forming an indis- 
tinct ridge near the branchiz, bearing one or more appendages. 
Rhinophores laminate, bearing styliform basal appendages. 
Head produced at the sides into tentacular processes. Odonto- 
phore with four spines in each transverse row, the two next the 
median line large and broad, with the inner margin denticulated ; 
no central spine. A spinous buceal collar. 
M. Lafont states his Drepania to differ from Ancula in the 
head bearing two elongated tentacles analogous to those of 
Eolis, in the branchie not being surrounded by linear appen- 
dages, and in the rhinophore carrying but one filament instead 
of two. Unless the lingual character proves to be importantly 
different from that of Ancula,it would seem advisable to unite 
Drepania with the latter genus. 
PotyceraA, Cuv., 1817. 
Syn.—Themisto, Oken, 1815 (part . Cuftea, Leach, 1820. 
Distr.—11 sp. Europe, Cape of Good Hope, Australasia. P. 
quadrilineata, Mull. (xc, 13). 
Body limaciform. Mantle indistinct, forming a supracapital 
veil, and a tuberculated ridge on the sides. Rhinophores lami- 
nated. Branchiz non-retractile, with lateral appendages. Odon- 
tophore with twelve to sixteen plates in each transverse row, 
the two near the centre large and bicuspid; no central spine. 
Lateral corneous jaws. 
pPALIO, Gray. Frontal veil short, bilobed, tuberculated on the 
edge; gills branched, with more than one tubercular appendage 
oneach side. P. ocellata. 
POLYCERELLA, Verrill, 1880. Body elongated-ovate, having the 
the same form as Polycera. Mantle little developed. Dorsal 
tentacles (rhinophores) not laminated and not retractile, without 
sheaths. A row of papille along each side of the back, extending 
beyond the gills. Gills three, pinnate, situated in the middle of 
the back, nearly as in Polycera. Foot auricled. Odontophore 
with six rows of teeth; median row absent ; inner laterals large, 
curved, with three denticles, two outer rows much smaller, 
simple, hook-shaped. P. Hmertoni, Verrill. New England. 
BrRaAcHYCcHLANIS, Ehrenb., 1831. 
Distr.—B. pantherina, Ehrenb. Red Sea. 
Mantle very small, forming a dorsal area, with narrow, 
upturned border. Rhinophores laminated, arising in front of 
the mantle-margin. Branchie retractile. Mouth terminal. 
