382 TRITONIAD A. 
foot in length, and feeds on other mollusks and crustaceans.— 
CuviER. 
Animal elliptical, depressed; head covered by a broadly 
expanded, fringed disk, with two conical tentacles, retractile into 
foliaceous sheaths; gills slightly branched, a single row down 
each side of the back; reproductive orifices behind first gills, 
vent on right side, behind second gill; stomach simple. 
ScyLtiaa, Linn. 
Etym.—Scyllea, a sea-nymph. 
Distr.—T sp. Atlantic, South Britain, Mediterranean, Phil- 
ippines, on floating sea-weed. SS. pelagica (xc, 16). 8S. Grayit, 
Ads (xc. 17): 
Animal elongated, compressed ; foot long, narrow, and chan- 
neled, adapted for clasping sea-weed; back with two pairs of 
wing-like lateral lobes, bearing small tufted branchiz on their 
inner surfaces; tentacles dorsal, slender, with lamellated tips, 
retractile into long sheaths; lingual teeth 24:1:24, denticulated ; 
gizzard armed with horny knife-plates; orifices on the right side. 
NEREA, Lesson. 10 lines long, with ear-shaped tentacles, and 
3 pairs of dorsal lobes. N. punctata, Lesson. 
MELIBE, Rang. 
Syn.—Chiorhea, Gould. 
Distr.—M. rosea, Rang (xe,18). M. (Chiorhea) leonina, Gla. 
(xci, 19). 
Head unusually large, upper tentacula or rhinophoria retrac- 
tile, perfoliate; pharynx with a strongly toothed jaw, but without 
radula; back with unequal leaf-, tree- and club-shaped papille ; 
no distinct gills. 
Denpronotus, Alder and Hancock. 
Etym.—Dendron, a tree, notos, the back. 
Distr.—Northern; on sea-weed and corallines; low-water to 
corralline zone. D. arborescens (xci, 20°. 
Animal elongated ; tentacles laminated ; front of the head with 
branched appendages; gills arborescent, in single series down 
each side of the back; foot narrow; lingual teeth 10°1:10; stomach 
and liver ramified. : 
LomMANotus, Verany. 
Syn.—Eumenis, A. and H. 
Distr.—3 sp. Britain and Mediterranean, on corallines.. L. 
(Genet, Verany (xci, 21). 
Animal elongated, smooth; head covered with a veil; tentacles 
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 front ; 
stomach ramified. psi 
