238 MR. P. S. ABRAHAM ON THE [ Mar. 6, 
b. Centre of back without filaments. Inner lingual spines recurved 
and denticulate; external spines hooked. Spinous collar in- 
complete and bilobed. 
5. Ipauia aspersa, Ald. & Hanc., Mon. Br. Nud. Moll. p. 46, 
pt. 1, fam. 1. pl. 26 (1845). 
I. cirrigera, Lovén. ? I. caudata, Cirst. 
Hab. North European coasts. 
6. I. rvmeauauis, Forbes & Hanl. Brit. Moll. iii. p. 579, pl. 20. 
f. 4 (1853). 
Hab. Shetland Isles. 
7. I. auapricornis, Forbes & Haul. 
Doris quadricornis, Montagu, Linn. Trans. xi. p. 17, pl. 4. f. 4 
(1815). 
Hab. South coast of England (Devonshire). 
8. I. putcnetya, Ald. & Hane. J. c. p. 46, and Append. p. v 
(1855). 
Hab. South coast of England (Cornwall). 
Genus Ancuta, Lovén, 1846. 
Miranda, Alder & Hancock, 1847 ; Drepania, Lafont, 1874. 
Body limaciform, smooth. Mantle obsolete, forming an indis- 
tinct ridge near the branchiz, bearing one or more appendages. 
Rhinophores laminate, bearing styliform basal appendages. Head 
produced at the sides into tentacular processes. Odontophore with 
four spines in each transverse row, the two next the median line large 
and broad, with the inner margin denticulated; no central spine. 
A spinous buccal collar. 
M. Lafont states his Drepania to differ from Ancula in the 
head bearing two elongated tentacles analogous to those of Folis, in 
the branchiz not being surrounded by linear appendages, and in 
the rhinophore carrying but one filament instead of two. Unless the 
lingual characters prove to be importantly different from those of 
Ancula, it would seem advisable to unite Drepania with the latter 
genus. 
a. With several appendages near the branchie. 
1. A. cristaTA, Lovén. 
Polycera cristata, Alder, Ann. & Mag. Nat. Hist. vi. p. 340, 
t. ix. f. 10-12 (1841). 
Miranda cristata (Ancula cristata in text), Ald. & Hane. 
Hab. North European shores. 
2. A. suLpHuREA', Stimpson, Mar. Inv. of Grand Manan, 
p- 26 (1853). 
Hab. Eastern North America (Grand Manan). 
1 Tt is doubtful whether this be not a variety of A. cristata. 
