208 SCIENTIFIC RESULTS OF THE 
restricted ; and the other, characterized by a more depressed form and 
the naked rhachis of the tongue, with the D. depressa, A. et H., as 
type. Hancock has given some anatomical remarks on the typical 
form (D. bilamellata, L.); but nothing else had been since made 
known about these animals! until my just cited notice and those of G. 
O. Sars.” 
The Lamellidorides approach the Acanthodorides, but differ even 
here, externally, by the coarsely granulated surface of the back and 
by the larger number of the branchial leaves, which are set in the 
form of a horseshoe ; the openings of the rhinophor-holes, the tenta- 
cles as well as the genital opening are also of a different shape. 
More notable still are the anatomical differences; the Lamellidorides 
want the armature of the lip-disk, which is found in the other group ; 
the armature of the tongue is quite different (1, I—1—I, 1), and the - 
buceal crop is connected with the bulbus pharyngeus by a stalk. The 
penis is quite different from that of the Acanthodorides, and without 
true armature ; the vagina is short. After all the Lamellidorides are 
much more allied to the Adalarie. 
The form of the body, as in the Acanthodorides, not very depressed. 
The back covered all over with semi-globular and short club-formed 
papille. The openings of the rhinophor-holes with plain margins and 
1 According to H. & A. Adams (the Gen. of Recent Moll., I, 1858, p. 
657), Lumellidoris is a synonym of ‘‘ Onchidoris, Blv.,’? which name is 
employed by Adams for a group, whose type should be D, pusilla, A. et 
H. (that scarcely belongs to the true Lamellidorides). Cf. also Gray, 
Guide I, 1857, p. 207. 
The genus Onchidoris of Blainville (Man. de Malac., 1825, p. 489, 
Pl. XLVI, f: 8.), ought to be rejected entirely, as founded very likely only 
‘on bad observation ; the genus figures with nearly impossible characters, 
both in relation to the tentacles (‘‘ quatre tentacules comme dans les Doris, 
outre deux appendices labiaux’’) and to the anus (‘‘médian a la partie 
inférieure et postérieure du rebord du manteau’’). The type of the genus 
Blainville found in the British Mus. (London), where it seemed to have 
disappeared, at least it was not to be found in the collection of nudi- 
branchiates which I looked over in May, 1873 (while, on the contrary, I 
found the long-lost type of the genus Lingwella, Blv., in his original glass, 
and so have re-established the denomination ZLinguella for the much later 
(1861) Saneara, Bgh. Cf. my Malacolog. Unters., Heft vi, 1874, p. 248). 
Later, Mr. Abraham (1. e. p. 223) seems to have found the original speci- 
men again. 
2 G. O. Sars, Moll. reg. arct. Norv., 1878, p. 306. Tab. XIII, figs. 5, 6; 
Tab. XIV, fig. 2, 3. 
