NOTARCHUS. 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 perfectly smooth, transparent, with 

 some white dots around the dorsal aperture. 



N. CITKINUS Rang. PL 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 (Rang). 



Mid- Atlantic, equatorial, on floating masses of Fucus. (Rang). 



Aplysia citrina RANG, Hist. Nat. Aplys.,p. 71, pi. 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. POLYOMMA Morch. Unfigured. 



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 (Morch, 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 (Mdrch). 



St. Croix, West Indies (Riise). 



Notarchus polyomma MORCH, Journ. de Conchyl. (3), iii, 1863, p. 

 25; Malak. Bl. xxii, p. 176. 



Section Stylocheilus Gould, 1852. 



Stylocheilus OLD., 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- 



