GASTEROPODA. 355 
Animal elongated, smooth; head covered with a veil; tentacies 
clavate, laminated, retractile into sheaths; gills filamentose, 
arranged along the sides of the back, on the wavy margins of 
the mantle; foot narrow, with tentacular processes in frent; 
stomach ramified. 
Distribution, 3 species. Britain and Mediterranean. On 
corallines. 
Faminty VIII.—Monipe. 
Animal with papillose gills (?), arranged along the sides of the 
back ; tentacles sheathless, non-retractile ; lingual teeth 0.1.0; 
ramifications of the stomach and liver extending into the dorsal 
papille ; excretory orifices on the right side; skin smooth, with- 
out spicula ; no distinct mantle. 
Hous, Cuvier. 
Synonyms, Psiloceros, Menke. Eubranchus, Forbes. Ampho- 
rina, Quatref. 
Type, Ai. papillosa, L. 
Etymology, Afolis, daughter of AXolus. 
Animal ovate; dorsal tentacles smooth, oval, slender ; papillee 
simple, cylindrical, numerous, depressed, andimbricated ; mouth 
with a horny upper jaw, consisting of two lateral plates, united 
above by a ligament; foot narrow; tongue with a single series 
of curyed, pectinated teeth ; spawn of numerous waved coils. 
Sub-genera. Flabellina, Cuvier. (Phyllodesmium, Ehr.) Body 
slender; dorsal tentacles laminated, buccal long; papille 
clustered ; spawn multi-spiral. Example, Hi. Coronata, Pl. 
XITI., Fig. 13 (also Fig. 11, p. 17). 
Cavolina, Brug. (Montagua, Flem.), C. peregrina. Body lan- 
ceolate ; tentacles smooth or wrinkled; papille in transverse, 
rather distant rows; spawn of 1 or 2 coils. 
Facelina, Griibe. Like Flabellina, but with the foot small, 
and the two front angular portions drawn out to a point. 
Distribution, 5 species. Sitka, North Sea. 
Coryphella, Landsborough. Like Cayolina, but with papillae 
arranged in groups. 4 species. 
Tergipes, Cuvier, T. lacinulata. Body linear; tentacles 
smooth; papillz in a single row on each side; spawn kidney- 
shaped. 
Distribution, Norway, Britain (33 species). United States, 
Mediterranean, South Atlantic, Pacific. Found amongst rocks at 
low water ; they are active animals, moving their tentacles con- 
tinually, and extending and contracting their papille; they swim 
