AOLIDA. 385 
GLAUcus (restricted). Includes the larger species; head small; 
body slender, with long tail; arms rather short, with the papille 
in one row; penis with a horny hook. 5 sp. Atlantic and 
Pacific Oceans. 
GLAUCILLA, Bergh. Size smaller; head strong; body bulky, 
with short tail ; arms more prominent, with the papille in sev- 
eral rows ; penis without hook; no large urticating threads. 2 
sp. Northern and Southern Pacific. 
LANIOGERUS, Blainv. Elongated, subcylindrical; thick and 
wide anteriorly, narrower and thinner behind ; having on each 
side a series of smooth, finely pectinated lamell, divided into 
two parts; four conical tentacles ; generative and anal orifice 
upon the right side. G. £/fortii, Blainv. (xci, 29). 
SUBFAMILY MOLINA. 
Foot large ; branchize in ranks on each side. 
Hous, Cuvier. 
Etym.— Molis, daughter of Aolus. 
Syn.—Psiloceros, Menke. Eubranchus, Forbes. Amphorina, 
Quatref. 
Distr.—Norway, Britain (33 sp.), United States, Mediterra- 
nean, South Atlantic, Pacific. 4. papillosa, L. 
Animal ovate; dorsal tentacles smooth, oval, slender; papill 
simple, cylindrical, numerous, depressed, and imbricated ; mouth 
with a horny upper jaw, consisting of two lateral plates, united 
above by a ligament; foot narrow; tongue with a single series 
of curved, pectinated teeth; spawn of numerous waved coils. 
Found amongst rocks at low-water; they are active animals, 
moving their tentacles continually, and extending and contract- 
ing their papille; they swim readily at the surface, inverted. 
They feed chiefly on sertularian zoophytes, and if kept fasting 
will devour each other; when irritated they discharge a milky 
fluid from their papilla, which are very liable to fall off. 
FACELINA, Alder and Hancock. (Acanthopsole, Trinchese.) 
Body rather slender, rhinophores perfoliate ; anterior angles of 
the narrow foot assuming the form of tentacles; middle part of 
the jaw strongly denticulated. (Nearly identical with Phidiana, 
Gray.) F. coronata, Forbes (xci, 30). 6 sp. Europe. 
PHIDIANA, Gray. Labial tentacles subulate; branchiz on both 
sides of the back, eomposed of cylindrical lobes, forming trans- 
verse rows for the whole. length of the mantle; orifice tubercular, 
on the right side, below the first row of branchiz ; edge of jaw 
with a single row of denticles, and the radula has but few teeth, 
piri in a single longitudinal row. Penis Pape: be Inca, 
d’Orb. (xci, 32). 
_ HERMISSENDA, Bergh, 1878, Near. Phidiana, but anterior angles 
