NOTARCHUE. 139 
Especially marked by the much swollen form, the narrow portions 
front and rear being of about equal length. Head small; tentacles 
as usual. The integument is perfectiy smooth, transparent, with 
some white dots around the dorsal aperture. 
N. crrxinus Rang. PI. 29, fig. 40. 
Lenth 25 mill. or smaller. Animal much dilated in the middle of 
the back, narrowed and acute at the two extremities. Integument 
a little translucent, yellow, with small white spots and very minute 
asperities, Dorsal aperture very small, narrow and a little oblique. 
Foot very narrow (Ranq). 
Mid-Atlantic, equatorial, on floating masses of Fucus. (Rang). 
Aplysia citrina Rane, Hist. Nat. Aplys., p. 71, pl. 22, f. 1, 2. 
The partial transparence of the integument allows some of the 
viscera to be seen. A liquor of the same color as the animal is 
produced. 
N. potyomma Morch. Unjfigured. 
Length of dead animal 17 mill. Body long-fusiform, pale green, 
ornamented with close obscure longitudinal lines, and numerous 
approximated scarlet ocelli, four forming a necklace; digitated or 
papillar appendages. Tentacles 4, subequal, slit in front; eyes be- 
tween them. Sole of the foot contracted in front, the forward mar- 
gin semilunar, acute behind. Mouth cordiform (Moreh, description 
from a drawing). 
Alcoholic specimens: Length 11 mill. Body warty, the epipodial 
lobes rounded, anal tube distinct, prolonged. Penis arcuate-conic, 
acute, tentacle-like, situated between the right eye and right ante- 
rior tentacle. Oral tentacles very short, obtuse, compressed and 
perpendicular ; posterior tentacles longer, truncate ; anterior shorter, 
somewhat acute. Seminal groove with a cord, passing obliquely 
downward to the base of the penis. Branchial plume falciform. 
Color pale yellowish with close longitudinal dusky lines, often con- 
fluent (Morch). 
St. Croix, West Indies (Riise). 
Notarchus polyomna Morcu, Journ. de Conchyl. (3), iii, 1863, p. 
25; Malak. BI. xxii, p. 176. 
Section Stylocheilus Gould, 1852. 
Stylocheilus Gup., U. S. Expl. Exped., xii, Moll., p. 224. 
Body limaciform, dilated at the sides and delicately attenuated 
posteriorly, cirrigerous; head separated from the body by a dis- 
