POLYCERIDA. 379 
retractile; branchig pinnate and non-retractile, placed round 
the anus almost on the centre of the back. Mouth without oral 
tentacles or veil, and without collar or jaws; odontophore broad, 
bearing simple spines. 
NeEmbrorTua, Bergh. 
Distr.—6 sp. Pacific. N. nigerrima, Bergh. 
Body limaciform, back and sides not separated; tentacles 
short, lobiform ; branchiz not retractile, sparsely foliate, almost 
in the middle of the back; foot narrow; labial armature small 
or none (?). 
§ B. Rhinophores non-retractile ; odontophore narrow. (Sten- 
oglosse.) 
Gontoporis, Forbes, 1840. 
Syn.— Doriprismatica, d’Orb., 1837 (part). Pelagella, Gray, 
1850. 
Distr.—9 sp. Universal. G@. nodosa, Mont. (xe, 10). 
Body rather depressed; mantle distinct with waved or scal- 
loped margin. Rhinophores laminated ; oral tentacles flattened ; 
branchiz non-retractile ; odontophore with four plates in each 
transverse row; the two next the median line bearing each a 
large spine; no central plate. A spinous buccal collar. 
AETHEDORIS, Abraham, 1876. 
Distr.—A. Indica, Ald. and Hane. Madras Coast. 
Alder and Hancoek figure in vol. 5 of the Zoological Society’s 
Transactions, a form belonging to a new genus ‘apparently 
related to Goniodoris.” As no specimen came into their hands, 
they could give no description. The most striking character- 
istic seen in the drawing is the expansion of the bilobed head, 
each lobe being semicrescentic, with the apex curved backwards 
and the margin bearing twelve to fourteen conical dentations. 
Ipauia, Leuckart, 1828. 
Syn.—Kuplocamus, Philippi, 1836 (part). 
Distr—8 sp. Europe and China. J. aspersa, Ald. and Hance. 
(xe, 11). 
Body convex,smooth. Mantle indistinct, the margins bearing 
filaments, generally longest in front. The head is produced 
anteriorly. Khinophores linear, laminated. Branchie simply 
pinnate, non-retractile. Odontophore with four spines in each 
transverse row, the two middle ones large, no central spines. A 
spinous buccal collar. 
IDALIELLA, Bergh, 1881. Differs in the absence of cirri in 
the middle of the back, and in the lateral lamelle of the hooklets 
on the lips. J. inequalis, Forbes and Hanley. 
