Family V. HEROIDAS.
-dSolidiform animals with branched errata, one pair of which is set in front of the
rhinophores. Radnla triseriate.J /Lirer in two longitudinal canals sending branches toi
cerata.
Genus 1. Hero L ov£n.
See Bergh 32, pp. 309—314; Eliot 2, pp. 239—241; Vayssi&re 1, pp. 88—92.
Foot rounded in front. Tentacles large, flat, and curved backwards. The cerata
are branched (the principle of division being dichotomous), and the first pair are in front
of the rhinophores. Jaws denticulate. Radula triseriate much as in Galvina. Genitalia
unarmed.
The rhinophores have no sheaths and appear to be smooth in life, but when preserved
they contract and become ringed or wrinkled.
1. H. formosa L oven.
var. arborescens E liot.
(.Pt. 8, PI. IV, jigs. 1—4.)
F amily VI. JANID.E.
iEolidiform animals in which the cerata extend in front of the rhinophores. Anus
dorsal. A crest often present between rhinophores. Radula wide.
Genus 1. Antiopella H oyle.
For anatomy, etc., see Bergh 6, pp. 597—605; Trinchese 1, pi. 44—48; Vayssiere 1, pp. 29—32.
Verany described this genus as Janus in 1844, and this is the name used by Bergh,
Trinchese, and YayssRre as being prior ta Antiopa, the name used by Alder and Hancock
in 1855. But, as Alder and Hancock point out in the text for PI. 43, Jarnis has been in
use for a genus of Hymenoptera since 1885, and is therefore invalid. But Hoyle states
(Journal of Conchology, 1902, p. 214) that Antiopa is in its turn invalid for a similar
reason, as it was used for a genus of Diptera in 1810. He proposes to call the animal
Antiopella, and it would seem that this name must stand.
Flattish aeolidiform animals, with cerata set round the dorsal margin, extending in
front of the rhinophores and leaving the central space bare. No cnidocysts. Short oral
tentacles. Rhinophores perfoliate with a crest between them. Anus in the medio-dorsal
line but far back. Jaws strong, denticulate. Radula from 18.1.18 to 40.1.40. Liver-
system composed of three main trunks which are ramified in the integuments, and also
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send off diverticula to the cerata set round the dorsal margin and in front of the rhinophores.
Genitalia unarmed.
Antiopella cristata (Delle Chiaje).
(Pt. 6, Pam. 3, PI. 44.)
Genus 2. Janolus B ergh:.
Bergh 23, pp. 18—-23; 47, pp. 7—11: Eliot 1, pp. 374—376.
Characters as in Antiopella, but the jaws are remarkably large and not denticulate.1
The margin of the foot is often very broad.
L J. hyalinus A. & H.
(Pt. 8, PI. V, jigs. 4—7.)
2. J. flagellatus E liot.
See Eliot, l. c.
An uncertain species, known only from one alcoholic specimen. Cerata very small,
but the larger may have been lost. Verge long and also provided with a long flagelli-
form appendage. Radula about 20.1.20; teeth not denticulate.
Genus 3. Proctonotus A. & H.
Rhinophores not perfoliate; no rhinophorial crest. Edge of jaws denticulate.
1. Pr. mucroniferus A. & H.
(Pt. 2, Pam. 3, PI. 42.)
See Farran 1, p. 9, for distribution and some other information.
F amily VII. FIONIDJE.
JSolidiform animals in which the cerata bear a branchial membrane. Male and
female orifices some distance apart. A rudimentary mantle-margin present. Radula
uniseriate. Liver in two longitudinal canals, which send branches to cerata.
1 It may be doubted if Janolus is really generically distinct from Antiopella. The difference in
the jaws is the only constant generic character, and the species differ from one another in many
respects. Thus J. hyalinus comes very near to Proctonotus. If the distinction between Antiopella
and Janolus were abolished the whole genus would be called Janolus, that name being prior to
Antiopella.