NOTARCHUS. 141 



tacles are longer, more linear, all furnished with papillce 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 as the same. Aplysia striata Quoy, is line- 

 ated like this, but has naked truncated tentacles, and very few cirri. 

 (Qld.), 



N. STRIATUS 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 on the 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, pi. 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-grfl^, 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. CIRROSUS 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 



