NOTARCHUS. 147 



Like many of the species of the allied genus Aplysia, this animal 

 possesses the power of emitting a purple fluid from the edges of the 

 mantle, but only in small quantity ; and it may often be handled 

 without anything of the kind being observed. 



N. AREOLA Pease. Unfigured. 



Length 2 inches. Elongate, smooth, rounded above, rather com- 

 pressed on the sides, and everywhere covered with small branchial 

 filaments. Mantle lobes elevated, short, rounded, and a groove ex- 

 tending from where they unite anteriorly on the back along the 

 right side of the head to the mouth. Dorsal tentacles elongate and 

 grooved laterally. Oral tentacles similar, but slightly dilated. 

 Eyes a little in advance and slightly lateral to the base of the dor- 

 sal tentacles. Branchiae large exposed or covered by the lobes of 

 the mantle. Siphonal tube posterior and tubular. Foot narrow, 

 elongated and projecting far beyond the lobes of the mantle in a 

 point. Color cinereous or greenish-ash, densely and minutely 

 veined longitudinally, and minutely speckled and clouded with 

 white. Remote ocellations with blue centers and brown rings on a 

 fawn ground, and scattering simple brown spots. (Pse.). 



Sandwich Is., gregarious among seaweed (Pse.). 



Aclesia areola PSE., P. Z. 8., 1860, p. 24. 



N. LACINULATUS Couthouy. PL 43, figs. 29, 30. 



Length 2i inches. Color pale green, closely covered with black 

 dots, which give it a bronze hue, whole body ornamented with little 

 green arborescent or frondescent tufts, irregularly disposed, except 

 around the upper margin of the foot, where they are smaller and 

 form a regular row ; viewed in the water, these tufted appendages 

 cause the animal to appear as if covered with a delicate moss. The 

 mouth is nearly concealed by its thick fleshy lips, which are pro- 

 longed on each side into a slender tentaculiform process. Foot 

 large and broad, sole yellow, dotted greenish. Twice as long 

 as broad, elevated, abruptly sloping behind, the foot trailing in a 

 point behind. ( Couth.). 



Harbor of Rio Janeiro, Brazil. 



Bursatella ladnulata Couthouy MS., GOULD, U. S. Expl. Exped % 

 Moll., p. 223, pi. 16, figs. 269, 269a. Notarchus lacinulatus MORCH, 

 Malak. BL, xxii, p. 176. ? Notarchus ladniatus Ru'pp., GuppY t 

 First sketch of a marine invertebrate fauna of the Gulf of Paria and 

 its neighborhood, in Proc. Sci. Asso. Trinidad, 1877, ii, p. 137 ; 



