NOTARCHUS. 141 
tacles are longer, more linear, all furnished with papille which are 
everywhere aculeate. But when we consider the identity of locality, 
the difficulty of delineating these animals while living, and their 
power of contracting and modifying parts, I think we may safely 
and properly regard them asthe same. Ap/lysia striata Quoy, is line- 
ated like this, but has naked truncated tentacles, and very few cirri. 
(Gid.). 
N.srriatus Quoy & Gaimard. PI. 29, figs. 47, 48, 49 (enlarged). 
Length about 1 inch. Region of the pleuropodial lobes much 
swollen, rounded; the rest of the body elongated, especially the 
foot, which is very acuminate behind, rounded in front, and well 
separated from the buccal disk. The four appendages are large and 
long. The integument is raised in small simple fleshy cirri, those 
on the margins of pleuropodial lobes having several branches. 
Ground-color a perceptibly greenish-yellow ; very finely striate with 
reddish-brown parallel lines. These recurve sometimes, forming 
concentric circles. Besides these, the whole body is covered with 
very small yellowish lunules, with sky-blue dots in the middle. Two 
of these spots occupy the base of the labial tentacles and in front of 
the eyes. The foot is striated onthe sole, like the rest of the body. 
Near Port Dorey, New Guinea, on floating Fucus (Astrolabe) ; 
Fouquets, Mauritius (Mobius). 
Aplysia striata Q. & G., Zool. Astrolabe, ii, p. 315, pl. 24, f. 9-11. 
—Aclesia striata Martens in Mobius’ Beitr. zur Meeresfauna 
Mauritius, p. 308. 
Mobius thus describes the Mauritius form, which is considered by 
Martens to be this species: Length when crawling 30-50 mill., 
breadth 7-8 mill. Greenish-gray, with white pointed warts. Black 
flecks and separated blue ones surrounded by a brown ring. These 
become distinct only under the microscope. Anus tubular, at back 
part of the gill orifice. The excrement contained shells of fora- 
minifera. 
N. crrrosvs Stimpson. 
Length 3 inches. Oblong, back rounded ; foot short and pointed 
behind, somewhat acuminate; body covered with numerous rather 
long appendages, much ramified on the back, but mostly simple on 
the head and tentacula; dorsal tentacula short, tapering, with the 
upper half slit ; orals large. Color bluish-grey, sprinkled with black 
