REPORT ON THE NUDIBRANCHIATA. 
117 
Family Doriopshle. 
This interesting Family, which has only been studied of late years, seems to be derived 
from the Dorididse. In internal structure these animals are closely allied to the Phyllidiadse, 
from which group, however, they differ greatly in external form, and have been united 
with them to form the group Porostomata. 1 
The Family consists of two genera — Doriopsis and Doriopsillar 
Doriopsis, Pease. 
Doriopsis , Pease, Proe. Zool. Soc. LoncL, 1860, p. 32; Amer. Journ. Conchol., vol. vi., 1871, 
p. 299. 
„ P., Bergb, Neue Nacktsclmecken der Siidsee, I. Journ. d. Mus. Godeffroy, Heft viii . , 
1875, pp. 82—94, Taf. s. figs. 21-23; Taf. xi. figs. 2-24. 
„ P., Idem, Malacolog. TJntersucli. (in Semper, Reisen im Archip. der Philipp. Th. II. 
Bd. ii. ), Heft x., 1876, pp. 384-387 ; Supplementheft i., 1880, pp. 9-13. 
„ Idem, Die Doriopsen des Atlant. Meeres., Jahrb. d. deutsch. Malacozool. Gesellscb., 
Bd. vi., 1879, pp. 42-64. 
„ Idem, Die Doriopsen des Mittelmeeres, Jahrb. d. deutsch. Malacozool. Gesellsch., 
Bd. vii., 1880, pp. 297-328, Taf. 10, 11. 
Doridopsis, Alder and Hancock, Trans. Zool. Soc. Bond., vol. v., part 3, 1864, pp. 124-1 30, pi. xxxi. 
„ Idem, Trans. Linn. Soc. Lond., vol. xxv. part 2, 1865, pp. 189-207, pis. xv.-xx. 
Haustellodoris, Pease, loc. cit., 1871, p. 300. 
Rhcicodoris, Morch, Journ. de Conchyl., ser. 3, t. iii., 1863, p. 34. 
Hexabranchus, Gray (nec Ehrb.), Figs, of Mollusc. Anim. 1850, vol. iv. p. 164. 
Corpus sat molle, forma fere omnino ut in Doridibus propriis. Apertura oralis pori- 
formis ; tentacula brevissima, aflixa ; rhinophoria et branchia ut in Doridibus propriis. 
Nothseum lseve vel tuberculatum, limbo palliali ut plurimum latiori undulato. Podarium 
latum, ut in Doridibus propriis. 
Bulbus pharyngeus elongatus suctorius mandibula et lingua destitutus.- — Penis hamis 
seriatis armatus. 
This genus was established by Pease in 1860, but its identity with the Doridopsis of 
Hancock was not made clear until the appearance in 1871 of another publication by 
Pease, where this author directly accentuated this identity. Hancock gave some account 
of the anatomy of this form, upon which I have myself contributed memoirs. 
In external characters Doriopsis is very similar to Doris , but may be distinguished by 
its softer consistency and the undulated margin of the mantle ; the mouth is a fine pore; 
the tentacles at the sides of the mouth are short and form a slight fold ; the retractile 
rhinophoria and branchia are like those of Doris ; the branchial leaves are tri- or quadri- 
1 Bergh, Malacolog. Untersucb., loc. cit., Heft x., 1876, title page. 
2 Bergb, Die Doriopsen des Mittelmeeres, Jahrb. d. deutsch. Malacozool. Gesellsch., Bd. vii., 1880, pp. 
316-326. 
