SIR C. ELIOT—REPORT ON THE NUDIBRANCHS. 113 
but the verge bears a long, curved, pointed, colourless stylet, which seems to 
be enclosed in a special sheath. 
These specimens resemble Kentrodoris (especially AK. maculosa) in most 
characters—the texture, the lappets formed by the margin of the foot, the 
stylet, and the short radula—but they differ in having a small but distinct 
labial armature. This brings them near Audura, but Audura has a different 
texture and denticulate teeth. They seem to be midway between Audura and 
Kentrodoris, but closer to the latter, to which they are here referred, the 
principal specific characters being the labial armature and the long slender 
branchiee. 
It is extremely probable that this form is the Doris setosa of Pease, but 
Pease gives no account of the mouthparts or genitalia, and his figure does 
not show the lappets of the foot or agree in all the details of coloration. The 
identity cannot therefore be regarded as established. 
PERONODORIS, Bergh. 
(Bergh: Malac. Unters. in Semper’s Reisen, vi. i. 1904, p. 44, ff.) 
Tt appears to me that the genera Peronodoris, Bergh, Halgerda, Bergh, 
Lietyodoris, Bergh, Asteronotus, Bergh, and Sclerodoris, Eliot, are more nearly 
allied than appears from Bergh’s classification, in which they are arranged 
under three subfamilies—the first in Archidoridide, the second in Diaululidee, 
the third and fourth in Platydorididee. They are all characterized externally 
by the presence of ridges on the back, but except for these ridges the skin is 
smooth or minutely granulated, not villous or papillate and not regularly 
tuberculate, although there may be tubercles on the ridges (especially at 
the points of junction) or more rarely separate tubercles near the ridges. 
The internal organs are much as in Archidoris. There is no labial armature ; 
the teeth rarely bear any denticles and the genitalia are not armed with 
hooks or spines. They show, however, a tendency to develop a stylet, in 
Peronodoris on the end of the verge, in Asteronotus near the female orifice. 
The genera and species may perhaps be tabulated as follows :— 
A. No armature on the genitalia. 
I. Halgerda, Bergh. Texture not hard or rough but leathery, or in some species like a 
stiff smooth jelly. Branchial pocket roundish. External teeth of radula some- 
times pectinate. 
HI, formosa, Bergh. 
. | Hl. apiculata, Alder & Hancock. 
H. punctata, Farran. These two species are probably identical. 
H, (Dictyodoris) tessellata, Bergh. 
. | H. wasinensis, Eliot. 
: H. (Dictyodoris) maculata (Eliot). This species is probably the young of the last. 
. | H. willeyt, Eliot, 1908. 
: H. graphica, Basedow & Hedley, 1905. These two species are probably identical. 
9. HE. elegans, Bergh. 
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