470 PROCEEDINGS OF THE NATIONAL MUSEUM. vol, 38. 



internal shell, the radula and pharyngeal bulb, the features of the gill- 

 cavity, and the anatomy and histology of t ho bifid left tentacle. The 

 material, consisting of the partially dissected body in formol, the 

 shell in formol, and a mount of the radula, has been deposited in 



the U. S. National Museum. 

 The description follows: 



ONCHIDIOPSIS CORYS.a new species. 



Locality. -Single specimen dredged off Fish Island, outside Hebron 

 Harbor, Labrador, in 7"> fathoms, mud, August 26, L908. 



Size. — In formol : Length, 20 mm. ; breadth, 1(5 nun.: height, 14mm. 



Color. In life: Cream colored, with 8(?) spots of varying shades 

 of brown [Bryant's notes]. In formol: Notaeum, ground-color light 

 purplish brown with darker markings on the lower sides, faintly and 

 vaguely reticulated over the fop and upper sides, so as to give the 

 effect of about twelve ill-defined blotches of the ground color. Ante- 

 rior lobes lighter and more yellowish. Head and foot same as ground 

 color of notaeum. Eye spots black. 



General form. — (PI. 21, figs. 1, 2, 3.) The notaeum, smooth on top 

 and sides, wrinkled or strongly folded and vesiculate elsewhere, rises 

 in a backward-tilted dome, suggesting a Grecian helmet (whence the 

 name chosen), the curiously puffed and wrinkled anterior border pro- 

 jecting visor-fashion. The fop and sides of the notaeum are closely 

 applied to the thin internal shell, which in turn closely covers the 

 large dome-shaped visceral hump. Below the folded border of the 

 notaeum arc 1 seen the well-demarked head and the foot, the former 

 bearing a large proboscis of truncated-cone shape, and two thick 

 tentacles about as long as the proboscis, with conspicuous eve ^pots 

 about two-thirds way up from their bases. The foot in the preserved 

 specimen is of moderate size, reaching anteriorly only to the level of 

 the tentacles and posteriorly projecting about one-sixth of its length 

 beyond the border of the Qotaeum, tin 1 projecting portion sharply 

 upturned. The very huge penis, situated on the right side of the neck, 

 comes partially into view below the notaeum above the right tentacle. 



Notn urn. Smooth tot he naked eye (act ually lineh w rinkled >, thin, 

 and closely investing the thin internal shell on the top and sides; the 

 lower sides more wrinkled; the border thickened, strongly folded, 

 ami vesiculate or puffy; the anterior border quite specialized, being 

 very strongly folded, and vesiculate or pustulate, so as to present tin 1 

 appearance of a mass of crowded water blisters. This anterior lappet 

 projects like a visor or eye shade over t he head and is cut n . v ' ne deep 

 inspiratory cleft (lying just to the left of the median line) and the 

 less deep expiratory cleft (lying about 65 degrees to the right, and 

 rather a fold than a cleft) into :i well-demarked right and ;i much less 

 well-marked left lobe. In life these anterior lobes or lappets evi- 

 dently play an important part, as thej are Luge, muscular, and 



" Kuii-ji , signifying an homeric helmet. 



